etallurgy of iron (C21)

C   Chemistry; metallurgy(311501)
C21            etallurgy of iron(23017)
High-strength seamless steel pipe for use in oil well, high resistance to cracking under stresses in sulphide-bearing medium // 2607503
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, namely to a high-strength seamless steel pipe suitable for use in oil wells. Seamless steel pipe is made from steel containing in wt%: C 0.15–0.50, Si 0.1–1.0, Mn 0.3–1.0, P 0.015 or less, S 0.005 or less, Al 0.01–0.1, N 0.01 or less, Cr 0.1–1.7, Mo from 0.40–1.1, V from 0.01–0.12, Nb 0.01–0.08, Ti 0.03 or less, B 0.0005–0.003, Fe and inevitable impurities – the rest. Structure of the steel pipe consists of a tempered martensite phase as the main phase and a former austenitic grain with the grain size of 8.5 or more. On four sections located at 90° from each other on a circumference hardness as per Vickers scale HV10 measured at the load of 10 kgf is equal to 295 HV10 or less in each of the three areas: in the area on the inner surface side at a distance from 2.54 to 3.81 mm from the inner surface of the pipe in the direction of its thickness, in the area on the outer surface side at a distance from 2.54 to 3.81 mm from the outer surface of the pipe in the direction of its thickness, and in the area in the center of the pipe wall thickness.EFFECT: pipe is characterized by high resistance to cracking under stresses in a sulphide-bearing medium.16 cl, 1 dwg, 3 tbl
ethod of repairing steel-tapping hole of basic oxygen furnace // 2607391
FIELD: metallurgy.SUBSTANCE: invention relates to the field of metallurgy, in particular to a method of hot repair of the tap hole of basic oxygen furnace. Method involves installation in the tap hole of the refractory block threaded on the metal tube, made in a form of a single piece comprising a flat washer and a truncated cone with the height of 1.5–2.0 of the tap hole diameter, and gunning of refractory block by gun mixture. Refractory block is installed in the tap hole ensuring the arrangement of the upper edge of the metal pipe over the tap hole. A flat washer is made with outer diameter equal to 2–3 diameters of the tap hole, and with a height equal to 0.5–1.0 of the diameter of the tap hole. On the outer surface of the flat washer evenly perform 3–4 vertical slits, the depth of which is equal to 1/3 of the radius.EFFECT: use of the invention provides increased durability of tap hole.3 cl, 7 dwg, 1 ex
ethod of producing powdered magnetically hard alloy 30h20k2m2v of iron-chrome-cobalt system // 2607074
FIELD: technological processes.SUBSTANCE: invention relates to production of powder of magnetically hard alloys. Method of producing powder of magnetically hard alloy 30H20K2M2V of iron-chrome-cobalt system involves preparing a mixture of powders of iron, chromium, cobalt, molybdenum and tungsten, moulding produced mixture, sintering, thermal treatment and thermo-magnetic treatment. After sintering before thermal treatment, method comprises hot plastic deformation with drawing of not less than 1.1. Thermo-magnetic treatment is carried out in temperature range 650–600°C.EFFECT: sintering temperature of alloy is lowered and magnetic hysteresis properties of alloy are improved while maintaining high coercitive force.1 cl, 1 tbl, 1 ex
Blowing lance with direct ignition through retractable ignition lance // 2607072
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for vacuum treatment of molten metal by means of blast lance. Blast lance comprises an outer jacket, which extends along a blast lance longitudinal axis, where an oxygen guide runs within outer jacket and comprises an oxygen exit at end. Inside outer side surface there is a channel for combustible gas, which has outlets for exit of combustible gas at end. In lance there is an ignition device with an ignition tip for ignition of combustible gas mixture. Ignition device can move between extended position and retracted position. In extended position ignition tip acts on mixing area, in which combustible gas supplied to oxygen outlet and combustible gas exiting through outlets for combustible gas are mixed to produce a combustible gas mixture. In retracted position ignition device is retracted into a protective area for protection against splashes of molten metal.EFFECT: invention enables to reliably perform ignition of combustible mixture formed at end for purge gas outlet.13 cl, 16 dwg
Flux for electroslag remelting // 2606691
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, in particular, to fluxes for electroslag technologies, for steel production and for refinement and modification of steel. Flux ANF-6-1 additionally contains cerium fluoride in the following proportions, wt %: flux ANF-6-1 75–80, cerium fluoride 20–25.EFFECT: invention allows to increase modifying capacity of flux and impact strength of steel at low temperatures, as well as reduce content of non-metallic inclusions in steel.1 cl, 1 tbl
ethod of reducing flicker in electric arc furnaces and device for its implementation // 2606672
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for production of steel in electric arc furnaces with control of flicker parameters. In the method memory bank data on flicker is created by storage device, storing momentary flicker (MF) time dynamics depending on state and performance characteristics, MF time dynamics measurement during initial phase of melting and related characteristics of state and operating characteristics is performed using recording device, MF time dynamics comparison during initial phase of melting is performed using computing device with stored melting phases time dynamics of common flicker data bank taking into account state characteristics and operating characteristics, selection of time general dynamics with maximum MF matching is performed using computing device, as well as state characteristics and operating characteristics as predicted total flicker dynamics, advanced dynamic matching of further steel production process control in comparison of predicted general dynamics with preset limits for flicker is performed using control unit.EFFECT: invention allows to control flicker indices to be expected and with high degree of probability can be determined, on the basis of state characteristics and operating characteristics, which are recorded during first minutes in melting phase; as such flicker can be effectively alleviated and maintained below preset limit values.26 cl, 4 dwg
ethod and nozzle for suppressing generation of iron-containing vapour // 2606666
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly to suppressing generation of iron-containing vapour during filling or emptying container (2) for an iron-containing metal melt with aid of CO2 snow. Method comprises applying CO2 snow jet (22) by means of nozzle (1) dispersing jet in a substantially planar manner, onto a surface of iron-containing stream (23) which is poured into or out of container (2). Disclosed device comprises container (2) for iron-containing melt, nozzle (1) to spray CO2 in substantially planar manner and device to control nozzle.EFFECT: use of invention provides cheap and compact design, suppression of formation of iron-containing vapour during filling or emptying of a container using less CO2 snow.19 cl, 4 dwg
ethod of cast steel parts controlled thermal treatment // 2606665
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and machine building. To increase cold resistance (impact strength) of railway cars steel cast parts following is successively performed: part heating to 860÷940 °C with holding, accelerated cooling at rate of 1÷25 °C/s to 400÷450 °C in air flow and isothermal self-tempering at room temperature. Weight of part from 20GL or 20G1FL steel is chosen so, that at its isothermal self-tempering at room temperature, part surface temperature reaches not less than 550 °C and not more than 650°C, wherein part heating is performed at rate of 5÷30 °C/min.EFFECT: higher cold resistance (impact strength) of railway cars steel cast parts.4 cl, 7 dwg, 2 tbl
ethod of producing iron-rich lime // 2606375
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, in particular, to a method of producing iron-rich lime. Method involves loading in tubular furnace in form of a mixture of limestone and iron-containing additive, firing and pelletizing. Prior to loading into furnace iron-containing additive is produced by granulation of converter sludge to level of humidity no more than 12.0 %, followed by mixing lime and iron-containing additive in ratio: limestone 99.0–99.9 %; iron-containing additive 0.1–1.0 %. Further, obtained charge is loaded in tubular furnace and annealed for 1.5–2 hours at furnace rotation of 1-1.5 rpm, wherein annealing is started at a temperature of 750–850 °C, and completed at temperature 800–900 °C. For preparation of iron-containing additive converter sludge is used with following chemical composition, wt%: Fe2O3 not less than 12.0; FeO not less than 29.0; Fetotal. not less than 40.0; balance – unavoidable impurities. Surface of lime pieces has a coating layer based on compounds CaO, MgO, FeO, Fe2O3 with thickness of 0.5–3.0 mm.EFFECT: invention ensures reduction of costs for production of steel due to increased degree and rate of recovery of CaO slag.3 cl, 1 ex
Steel sheet with high mechanical strength, ductility and formability properties, production method and use of such sheets // 2606361
FIELD: metallurgy.SUBSTANCE: invention relates to production of cold-rolled steel sheet with strength of more than 1,000 MPa, uniform elongation greater than 12 % and a V-bendability greater than 90°, which contains, wt%: 0.15 ≤ C ≤ 0.25, 1.8 ≤ Mn ≤ 3.0, 1.2 ≤ Si ≤ 2, 0 ≤ A1 ≤ 0.10, 0% ≤ Cr ≤ 0.50 %, 0 ≤ Cu ≤ 1, 0 ≤ Ni ≤ 1, 0 ≤ S ≤ 0.005, 0 ≤ P ≤ 0.020, Nb ≤ 0.015, Ti ≤ 0.020, V ≤ 0.015, Co ≤ 1, N ≤ 0.008, B ≤ 0.001, wherein Mn + Ni + Cu ≤ 3, balance is iron and unavoidable impurities formed during manufacture.EFFECT: microstructure consists in portions of area of 5–20 % polygonal ferrite, 10–15 % of residual austenite, 5–15 % of martensite, balance is bainite is in form of laths and includes carbides between laths, so that number N of inter-lath carbides larger than 0,1 micrometers per unit of surface area, is less than or equal to 50,000/mm2.15 cl, 3 dwg, 5 tbl
ethod and forming tool for hot forming and press hardening galvanized workpieces of sheet steel (versions) // 2606359
FIELD: metal processing.SUBSTANCE: invention relates to metal forming, in particular, to a method for hot forming and press hardening plate-shaped workpieces of galvanized sheet steel. workpiece is heated to a temperature above austenitisation temperature and is then formed and quenched in a cooled forming tool having a punch and a female mold. Female mold used is coated in its drawing edge region with material in a material-uniting manner, having a thermal conductivity lower than thermal conductivity of portion of the female mold adjacent to drawing edge region, and comes into contact with workpiece. Surface of coating deposited in edge region facing workpiece has a dimension extending along drawing edge, value of which exceeds positive radius of drawing die.EFFECT: reduced probability of crack formation in workpieces.20 cl
ethod for production of hot-rolled thick sheets from low-alloy steel for nuclear and power engineering // 2606357
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for making large-size products of nuclear and power engineering. For production of rolled stock with thickness from 80 to 150 mm with guarantee of standard properties after normalization with tempering of continuously cast workpieces with thickness of not less than 315 mm, austenisation of workpieces is carried out at a temperature of 1,200–1,215 °C, rough rolling is started at a temperature not lower than 950 °C and is performed to roll thickness not less than 1.3 thickness of finished sheet with relative reduction per pass of not less than 10 %, finish rolling is started at temperature of 115±25 °C above point of Ar3 and ends at 5–15 °C above temperature of beginning of finish rolling, then sheets are subjected to slow cooling in air in a stack. Continuous cast workpieces are made from steel containing, wt%: 0.09–0.12 C; 0.70–0.80 Si; 1.55–1.70 Mn; 0.20–0.30 Cr; 0.20–0.30 Ni; Cu ≤ 0.10; 0.015–0.030 Ti; N ≤ 0.008; 0.02–0,05 Al; S ≤ 0.002; P ≤ 0.010; Fe and impurities – balance.EFFECT: structure of finished sheet is represented by ferrite and sorbite-like pearlite in volume ratio of not less than 30 % and is characterised by high homogeneity, wherein grains, different from prevailing number more than 1 occupy an area of not more than 10 %.1 cl, 4 tbl
ethod of protective scull forming on oxygen converter lining surface and magnesian briquetted flux (mbf) for its implementation // 2606351
FIELD: metallurgy.SUBSTANCE: invention relates to ferrous metallurgy, in particular, to methods of protective scull forming on converter lining surface. Method consists in final slag leaving in converter, preliminary blowing of final slag with oxygen and magnesia briquetted flux addition into converter with subsequent flux modified final slag blowing with neutral gas. Between lining spraying additionally performing is magnesia briquetted flux addition in supplied into converter charging on scrap metal, wherein at each stage flux is added in amount of 2.7–8.0 kg/t of steel, spraying and melting are carried out at temperature of 1,580–1,680 °C, and used magnesia briquetted flux is composition containing magnesian component, containing periclase-carbon, in form of melting and casting units waste lining scrap and dolomite.EFFECT: enabling increased duration of vessel campaign period from 3,000 to 5,000–8,000 melts with considerable cost-cutting of used magnesian flux.2 cl, 2 tbl, 3 ex
ethod for welding thick-walled large-size parts // 2606144
FIELD: technological processes.SUBSTANCE: invention relates to a method for automatic welding thick-walled large-size parts from Ni-Cr-based alloy and can be used in production of a liquid-propellant engine. Proposed method comprises V-shaped cutting edges of welded parts, installation of welded parts on the substrate, multilayer welding using a filler wire from Ni-Cr-based alloy with diameter of 2–2.5 mm. Then, the welded joint is being hardened at 1,050±10 °C. Then, part is being cooled at a rate of 30–40 °C/min, and during cooling when temperature of 700–780 °C is achieved, the part is being held for 60±10 and, then, cooled.EFFECT: invention allows preventing cracks in heat-affected zone of welded parts.1 cl, 3 dwg, 1 ex
ethod and device for iron smelting // 2606135
FIELD: technological processes.SUBSTANCE: invention relates to method and device for recovery of containing iron oxides material. Material containing iron oxides forms a stationary layer in reducing shaft furnace and it is converted into a prereduced material by means of at least one gas fed in the fixed bed under pressure p1. At least part of preliminarily reduced material is introduced into a melting gasifier, wherein with the help of pressurized p2 reducing gas undergoes complete recovery. Note here that top smoke with pressure p3 is removed from the space above the stationary layer, and of stationary layer is removed at least one dust blowout gas under pressure p4. Note here condition p1>p4 and p1>p3 and preferably p4>p3. At least over the part of the path extending previously repaired material in melting gasifier, between reducing shaft furnace and melting gasifier, together with previously restored material towards melting gasifier is carried out at least part of at least one dust blowout gas.EFFECT: invention is aimed at reducing or preventing formation of deposits of dust in reducing shaft furnace.12 cl, 5 dwg

ethod for ultrasonic welding of thick-wall structures // 2605888
FIELD: technological processes.SUBSTANCE: invention relates to welding, namely to welding of thick-wall structures. To increase resistance to occurrence of cracks during operation due to improved mechanical properties method involves application of cyclic load on crystallizing metal of welding bath. Welding of each odd layer of multi-layer welding, including first and last ones, is accompanied by ultrasonic treatment, and welding of each even layer is accompanied by cooling. Ultrasonic vibrations are introduced at angle of 45-60° to seam axis, while cooling is performed from opposite side relative to heating source with air-water mix with temperature from 10-15 °C and flow rate of mixture of 0.3-0.5 l/min.EFFECT: increase of durability, improved mechanical properties.3 cl, 5 dwg, 1 tbl

ethod of fencing weapons blades making // 2605886
FIELD: weapons and ammunition.SUBSTANCE: invention relates to sports arms field and can be used during production of fencing weapons blades, in particular backswords, sabres and court swords blades, to increase blade handle and welded seam strength properties while saving used expensive steel and increasing blade rigidity. Two large diameter bar workpieces 1 from carbon steel and smaller diameter polished bar workpiece 2 from martensite-ageing steel are connected by contact butt welding. Then, performing reduction of semi-finished product by cold rolling to form first double stepped workpiece, and then blade required profile: for rapier is rectangular, for sabre is trapezoidal and for court sword is V-shaped.EFFECT: after deformation performing machining with subsequent thermal treatment, carried out in two stages, first hardening only blade section from carbon steel, then, performing tempering of whole blade, wherein performing simultaneous tempering for blade section from martensite-ageing steel and for blade section from carbon steel.1 cl, 4 dwg

Hardening medium cooling ability determining device // 2605883
FIELD: technological processes.SUBSTANCE: invention relates to steel and alloys thermal treatment and can be used in design of hardening media cooling capacity determining devices. Plant includes base with vertical post, tubular furnace, vessel with hardening medium and with hardening medium heater, heat flow probe, connected to computer, installed on vertical post said sensor transfer mechanism from tubular furnace into vessel with hardening medium and control system. At that, plant is equipped with movable table, installed on base, and heat flow sensor transfer mechanism is made in form of grip, installed on said post with possibility of vertical movement along it. Tubular furnace and vessel with hardening medium are arranged on said table with possibility of alternate arrangement under grip with heat flow sensor at table longitudinal movement along base relative to vertical post.EFFECT: using invention allows to simplify plant design due to application of heat flow sensor plane-parallel transfer and simultaneously increase accuracy of its positioning.1 cl, 1 dwg

ethod of controlling length of electric arc in electric arc furnace, device for carrying out method, as well as electric arc furnace with such device // 2605739
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for regulating length of electric arc in an arc furnace. Method comprises measuring vibrations at a wall of furnace vessel, through which is determined a slag height (Hrel) of melt, wherein when at deviations of a determined actual slag height (Hrel) from a given value (S), control and/or regulation signals are output, through which is set electric arc length of at least one electrode by regulation of impedance of at least one electrode. Device comprises at least one structure-borne sound sensor for detecting vibrations at a wall of furnace vessel, computing unit configured to calculate an actual value of a slag height (Hrel) in furnace vessel, and a control or regulating unit for adjusting electric arc length of at least one electrode by regulating impedance of at least one electrode at deviation of actual slag height (Hrel) from specified value.EFFECT: invention provides fast response to change of slag height, wherein fuzzy logic-based control system generates correction coefficients for individual electric arc lengths over a short reaction time of approximately one second.28 cl, 2 dwg

Installation for reduction smelting and operating method of reduction smelting // 2605738
FIELD: technological processes.SUBSTANCE: invention relates to method and apparatus for reducing melting. Plant includes loading device for solid carbon carriers and iron containing charge components, melting gasification area, which comprises stationary layer formed by solid carbon carriers and iron containing components of charge, lower section to receive liquid cast iron or, respectively, steel semi-finished product, and liquid slag, tap hole for discharge of liquid slag and liquid cast iron, oxygen blowing Tuyere for oxygen supply. At that, Tuyere are arranged in at least two spaced apart, in particular in vertical direction, and located parallel to each other Tuyere caissons zones, and distributed along horizontal plane around the perimeter of installation for reduction smelting, and in different zones of Tuyere caissons are shifted relative to each other. Vertical distance between Tuyere belts, in particular, vertical distance between tuyeres outlets, is less than or equal to horizontal distance between oxygen blowing tuyeres.EFFECT: invention provides reliable operation of the plant, higher efficiency.10 cl, 3 dwg

ethod and apparatus for pretreatment of rolled article before hot rolling // 2605733
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, specifically to a method and a device for preliminary treatment of a rolled article. Method for preliminary treatment of a rolled steel article before hot rolling includes preliminary heating of rolled article in preheating furnace using burners, removal of scales in device for removal of scales and heating article in heating furnace using burners. Burner is fired at conditions lower than stoichiometric conditions, carbon carrier while holding article in furnace in reducing atmosphere. Further, method includes introduction of a first part of exhaust gas and oxygen into preheating furnace and post-combustion of first part of exhaust gas in preheating furnace. Amount of oxygen is selected to allow holding of article in preheating furnace in an oxidative atmosphere.EFFECT: providing energy-efficient heating and thorough release from scale.14 cl, 3 dwg
Strip or sheet of electric steel with unoriented grain structure, structural element made thereof and method of strip or sheet production from electric steel with unoriented grain structure // 2605730
FIELD: technological processes.SUBSTANCE: invention relates to production of strips or sheets from electrotechnical steel with unoriented grain structure. Method comprises following steps: a) creation of hot-rolled steel strip or sheet, which contains following, wt%: 1.0-4.5 of Si, up to 2.0 of Al, up to 1.0 of Mn, up to 0.01 of C, up to 0.01 of N, up to 0.012 of S, 0.1-0.5 of Ti, 0.1-0.3 of P, iron and unavoidable impurities are rest, wherein for ratio %Ti/%P applies inequality 1.0≤%Ti/%P≤2.0, where %Ti is Ti percentage, in wt% and %P is P percentage, in wt%, b) cold rolling of hot-rolled strip or sheet with production of cold-rolled strip or sheet, c) final annealing of cold-rolled strip or sheet, during which cold-rolled strip or sheet is passed through continuous annealing furnace for two-staged short-term annealing, at which cold-rolled strip or sheet: d.1) is first annealed at first annealing stage for 1-100 s at annealing temperature of, at least 900 °C and not more than 1,150 °C. Then d.2) annealed at second annealing stage for 30-120 s at annealing temperature of 500-850 °C.EFFECT: technical result consists in improvement of sheet or strip strength with simultaneous low hysteresis losses at high frequencies.1 cl, 8 tbl

Gas outlet channel of converter // 2605726
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly to gas outlet channel of a converter. Gas outlet channel comprises converter gas cooler, in downtake gas duct of which below junction gas duct are arranged convective screens, preliminary cooling unit, scrubber, venturi tube and condensed moisture collection unit, which are installed on a common hopper, clean gas duct, smoke exhauster, smoke stack and connecting gas ducts. Downtake gas duct of converter gas cooler is connected to preliminary cooling unit by means of hydraulic compensator. Preliminary cooling unit and common hopper are equipped with means for draining excess sludge water. On clean gas duct there is a film moisture trap. Gas outlet duct is equipped with compensators of thermal expansion.EFFECT: invention enables to reduce number of unscheduled stops of gas outlet duct for repair.5 cl, 4 dwg

Electric sheet steel with aligned grain structure and its manufacturing method // 2605725
FIELD: metallurgy.SUBSTANCE: invention relates to electric sheet steels. Electric sheet steel with an aligned grain structure comprises grooves, each of which passes in the direction, which intersects the direction of rolling the said sheet steel, herewith the said grooves are formed by a laser beam irradiation with preset PL pitches in the rolling direction. Shape of each of the grooves on the front surface of the said sheet steel is determined as a curved line on the above said steel. Herewith the connection between D value of standard deviation and PL pitch satisfies the following ratio (1), where D value is the standard deviation of distances between a linearly approximated direct line produced from a curved axial line of each groove in the groove width direction by the least squares method and corresponding positions on the said curved axial line, the mean angle formed between tangents in each of the said positions on the said curved axial line and the direction perpendicular to the rolling direction is from more than 0 to 30°: 0.02 ≤ (D/PL).EFFECT: technical result is reduction of iron losses in the sheet steel.5 cl, 7 dwg

ethod of helical springs hardening // 2605541
FIELD: machine building.SUBSTANCE: invention relates to machine building. To increase spring resilient properties stability and reduced duration of production cycle cylindrical springs strengthening method comprises spring winding with pitch exceeding pitch of finished spring, heat treatment, penetrant inspection, ends polishing, wheel blasting, spring external and internal surfaces predeformation and cold working and along turns to each other contact line in single operation or separately.EFFECT: invention can be used during helical compression springs hardening.3 cl, 1 dwg

Slag forming mixture for steel refining // 2605410
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for steel refining in "ladle-furnace" aggregates and vacuum vessels. Slag-forming mixture contains as flux secondary aluminium production wastes and a slag component and additionally sodium bicarbonate at following ratio of components, wt%: sodium bicarbonate 1.0-2.0, wastes from production of secondary aluminium 10.0-30.0, slag component makes up balance. Secondary aluminium production wastes, having following chemical composition, wt%: fine Al metal 5.0-20.0, Al2O3 50.0-75.0, MgO 5.0-12.0, SiO2 1.0-10.0, (NaCl+KCl+NaF+KF+Na2O+K2O) 5.0-20.0.EFFECT: achieving low viscosity of slag, high degree of refinement and desulphurisation of steel, resistance of lining.1 cl, 1 dwg, 3 tbl

Systems and methods for recycling steelmaking converter exhaust residue and products made thereby // 2605409
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for processing sludge from a fume scrubbing system of a steelmaking converter and articles made therefrom. System includes equipment for separation and processing of sludge for separation of substantially microspheres metallic iron from material not related to metal iron, wherein said separation equipment comprises an ultrasonic cleaner for removal of surface of small fractions, associated with microspheres metallic iron using at least two different excitation frequencies of acoustic cavitation for creation of metal microspheres with treated surface, and moulding equipment for arrangement of microspheres of metallic iron with treated surface, separated by said equipment for separation, and moulding using same lumpy material substantially consisting of microspheres of metallic iron. Lumpy material is used as a charge material in melting steel in steelmaking converter or arc furnace.EFFECT: invention enables to use briquettes with high content of metal iron in steelmaking charge material for oxygen converter or arc furnace, and water used in system, which is returned and reused in system, making system harmless to environment, as well as use of sludge in form of pellets and/or agglomerate for production of cast iron.24 cl, 16 dwg

Cold-rolled steel sheet and method for manufacture thereof, and hot-formed article // 2605404
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly, to cold-rolled steel plate used in automotive industry. Sheet has chemical composition, containing, wt%: C from 0.1 to 0.3, Si from 0.01 to 2.0, Mn from 1.5 to 2.5, P from 0.001 to 0.06, S from 0.001 to 0.01, N from 0.0005 to 0.01, Al from 0.01 to 0.05, B from 0 to 0.002, Mo from 0 to 0.5, Cr from 0 to 0.5, V from 0 to 0.1, Ti from 0 to 0.1, Nb from 0 to 0.05, Ni from 0 to 1.0, Cu from 0 to 1.0, Ca from 0 to 0.005, REM from 0 to 0.005, Fe and unavoidable impurities - balance. Structure before and after hot forming includes a ferrite with fraction of area from 30% to 90%, martensite with fraction of area of 0 % or more and less than 20 %, pearlite with fraction of area from 0 % to 10 %, residual austenite from 5 % by volume to 20 % by volume, remaining structure - bainite. Hardness of residual austenite, measured with a nano-indentor before and after hot forming, satisfies expression H2/H1 < 1.1 and expression σHM < 20, and ultimate tensile strength and ductility satisfy relationship: TS×El ≥ 20,000 MPa·%, where H1 is hardness of residual austenite present inside surface part on thickness before and after hot forming, wherein surface part on thickness is a zone within 200 mcm in direction of thickness from surface of cold-rolled steel sheet, H2 is a hardness of residual austenite, located inside central part on thickness before and after hot forming, wherein central part on thickness is a zone in range of ±100 mcm along direction of thickness from central plane of cold-rolled steel sheet in direction of thickness, σHM is a change in hardness of residual austenite inside central part on thickness before and after hot forming, TS is tensile strength of cold-rolled steel sheet, MPa, and El is ductility of cold-rolled steel sheet in %.EFFECT: high ductility and formability.16 cl, 5 dwg, 8 tbl, 1 ex

High-strength steel pipes with low ratio of yield strength to ultimate strength, welded with electric contact welding, steel strip for pipes, welded with electric contact welding, and manufacturing methods thereof // 2605396
FIELD: technological processes.SUBSTANCE: invention relates to high-strength steel pipe with low ratio of yield strength to ultimate strength, welded with electric contact welding, with ratio of yield strength to ultimate strength of 80 % or less and TS 655 MPA or higher and its manufacturing method. In particular, steel material of composition, including, wt%: 0.38-0.45 C, 0.15-0.25 Si, 1.0-1.8 Mn, 0.03 or less P, 0.03 or less S, 0.01-0.07 sol. Al and 0.005 or less N by weight is subjected to rough and finish rolling, at which initial temperature is 950 °C or lower and final temperature is 820-920 °C, thus hot-rolled steel strip is obtained. Strip is wound at temperature of 650-800 °C, then unwound, molded and welded with electric contact welding at room temperature.EFFECT: manufacturing of steel pipe with small changes of properties in longitudinal direction ΔTS 20 MPa or less, low ratio of yield strength to ultimate strength of 80 % or less and high strength, id est, yield strength YS 379-552 MPa and ultimate tensile strength TS 655 MPA or higher.12 cl, 3 tbl, 2 dwg

ethod for production of high-strength hot-rolled steel // 2605037
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, specifically to production of high-strength hot-rolled steel, used for making articles for petrochemistry and high-speed transport operating in extreme conditions, as well as base layer of bimetallic structures. Workpiece is produced from steel containing following component ratio, wt%: carbon 0.16-0.45, silicon 0.05-0.70, manganese 0.50-1.50, sulphur 0.002-0.008, phosphorus not more than 0.015, chromium not more than 0.15, nickel not more than 0.15, copper not more than 0.15, niobium from 0.005 to less than 0.01, acid-soluble aluminium 0.02-0.05, iron and unavoidable impurities - balance, wherein content of manganese and sulphur is linked by relationship [Mn]·[S] < 0.005. Workpiece is heated to temperature within range from more than 1,250 to 1,300 °C and subjected to hot rolling.EFFECT: obtained rolled product has high strength properties.1 cl, 2 tbl

Low alloyed steel for oilfield gage pipes having excellent resistance to sulphide stress cracking, and its manufacturing method // 2605033
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, namely to low-alloy steel for oilfield gage pipes. Steel has chemical composition, containing, in wt%: C: from 0.56 to 1.00, Si: from 0.05 to 0.50, Mn: from 0.05 to 1.00, P: not exceeding 0.025, S: not exceeding 0.010, Al: from 0.005 to 0.100, Mo: from 0.40 to 1.00, V: from 0.07 to 0.30, O: not exceeding 0.010, N: not exceeding 0.03, rest is Fe and unavoidable impurities. Steel has yield point, making at least 862 MPa, and diffraction maximum width at half height for crystal lattice plane [211], obtained by x-ray diffraction measurement is not more than 0.50°.EFFECT: steel has high mechanical properties and resistance to corrosion in sulphide containing environment.22 cl, 4 dwg, 4 tbl, 2 ex

Clad material for steel sheet cladded with stainless steel, steel sheet cladded with stainless steel, including its production method // 2605021
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, namely to clad material for steel sheet used in marine structures, devices of sea water desalination. Clad material contains, wt%: 0.03 or less of carbon, 1.5 or less of silicon, 2.0 or less of manganese, 0.04 or less of phosphorus, 0.03 or less of sulphur, from 22.0 to 25.0 of nickel, from 21.0 to 25.0 of chromium, from 2.0 to 5.0 of molybdenum, from 0.15 to 0.25 of nitrogen, iron and unavoidable impurities are the rest. Pitting corrosion (CPT) critical temperature of clad material after normalization determined in accordance with ASTM G48-03 Method E is 45 °C or higher, and losses from corrosion in welding zone defined by corrosion test in accordance with standard NORSOK M-601 are 1.0 g/m2 or less.EFFECT: clad material for steel sheet has high corrosion resistance to sea water, provides integrity of compound with improved reliability with simultaneous maintenance of high corrosion and mechanical properties of main and clad materials.9 cl, 1 tbl, 1 ex

Heating device and plant with it for heating continuous metal sheet // 2605020
FIELD: heating.SUBSTANCE: invention relates to induction heating. For uniform heating a metal sheet over its width and providing the possibility of installing the device in a rolling line having a narrow space disclosed is a device for heating and a plant with it for heating a continuous metal sheet. Device for heating comprises poles located on at least one surface of a flat sheet spaced from each other to generate magnetic fields for heating the flat sheet and joint with the poles end leads to supply current and to facilitate the use of the space.EFFECT: heating device can improve the structure of coils winding, such as the pole and the head, thus, finally, optimally heat a metal sheet effectively using the space.8 cl, 6 dwg

ethod of producing high-strength cast iron // 2605016
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for producing high-strength cast iron, suitable for production of articles with high ultimate strength. Method comprises melting and alloying of cast iron in induction furnace, graphitizing and inoculating modification, filling the shape with modified cast iron, obtaining casting with its further removal after crystallization from the mold at temperature of 900-1,000 °C, replacing the castings in the furnace with temperature of 950-1,000 °C and holding in the furnace for 10-30 minutes, with further isothermal hardening at temperature 300-320 °C for 60 minutes and air cooling, said alloying is performed with aluminium, silicon, nickel, copper, molybdenum and manganese, graphitizing and inoculating modification is carried out in the ladle, castings are produced in metal form in form of metal mold, after holding in the furnace cast iron castings are is produced with globular graphite and austenite-bainitic structure of the following chemical composition, wt%: carbon 2.5-3.2; silicon 1.5-2.5; aluminium 7.2-9.0; manganese 0.7-0.75; magnesium 0.04-0.06; molybdenum 0.7-1.2; nickel 0.48-0.52; copper 0.49-0.52; sulphur 0.01-0.012; phosphorus 0.06-0.08; iron-the rest, isothermal hardening of the produced casting is carried out in pseudo-boiling disperse carborundum layer in the area of austenite-bainitic conversion.EFFECT: invention allows enlarging the application area of high-strength cast iron with globular graphite and austenite-bainitic structure with ultimate strength of σB≥1,200 MPa by bainitic hardening from cast state without additional thermal treatment.1 cl, 1 tbl

Two-phase steel sheet and method of making thereof // 2605014
FIELD: metallurgy.SUBSTANCE: sheet is produced from two-phase steel containing wt%. %, C 0.01-0.1, Mn 0.2-3, Al 0.04-1.5, Ti 0.015-0.2, P 0.01 or less, S 0.005 or less, N 0.01 or less, if the following condition is fulfilled [Ti] - 48/14 × [N] - 48/32 × [S] ≥ 0 %, and it has been established that Ex.C (%) = [C] - 12/48 × {[Ti]+48/93 × [Nb] - 48/14 × [N] - 48/32 × [S]}, following condition is satisfied 0.001 ≤ Ex.C (%)/fsd (%) ≤ 0.01, Fe and the rest - impurities, wherein at the depth of 1/4 of the plate thickness the microstructure is two-phase, with its main phase consisting of polygonal ferrite dispersion strengthened with carbide Ti, and the second phase including multiply dispersed products of low-temperature conversion at the area ratio of 1-10 % (fsd (%)), and the average diameter of crystals of products of low-temperature conversion is 3-15 mcm, and the average value of maximum distance between the products of low-temperature conversion is 10-20 mcm.EFFECT: higher ductility and strength with provision of uniform relative elongation and suitability for hole flanging.12 cl, 5 tbl, 1 dwg

Shaft furnace charging installation and method of shaft furnace charging // 2605006
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used during shaft furnace charging. Charging installation comprises first and second collecting bins arranged parallel to each other, wherein each of first and second collecting bins has inlet hole to receive material and outlet hole for material charging into shaft furnace. Receiving bin is arranged to turn about horizontal axis of rotation and is designed for receiving and distributing material into one of first and second bins, wherein receiving bin is made with possibility of rotation at least between two transfer positions, wherein in the first transfer position receiving bin outlet is arranged coaxially with first collecting bin inlet opening, and in second transfer position is coaxially with second collecting bin inlet opening. Charging installation also contains material gate, related to receiving bin outlet opening, and drive mechanism related to material gate, for receiving bin outlet hole opening and closing, wherein drive mechanism is made with possibility to close outlet opening when receiving bin is in rest position and outlet opening when receiving bin is in any of first or second transfer positions. Drive mechanism is made with possibility to actuate material gate due to receiving bin turning movement.EFFECT: invention allows creating special material gate structure able to prevent charge material residue fall on closed sealing valve or against falling between two collecting bins.17 cl, 4 dwg

Oriented-grain electric steel sheet and method of producing oriented-grain electrical steel sheet // 2604550
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. To improve magnetic characteristics of sheet of oriented-grain electric steel and eliminate crescent deformation, method includes: laser treatment process, where a laser-treated portion is formed by laser radiation of an area on one end side of steel sheet in direction of width, after treatment during cold rolling, with a laser beam along steel sheet rolling direction; and final annealing process, in which steel sheet with laser-treated portion formed thereon is wound in form of a roll and final annealing is performed on rolled steel sheet.EFFECT: during laser treatment of melting and repeated hardening portion having depth of more than 0 % and equal or less than 80% of plate thickness on steel sheet, is formed by laser beam irradiation in a position corresponding to laser-treated portion.16 cl, 1 tbl, 18 dwg
ethod of determining moment of replacement of air tuyere of blast furnace with heat insulation of inner shell // 2604549
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, in particular, to a method of determining moment of breakdown of heat insulation of air tuyere of blast furnace. Method involves determination of temperature difference of input and output water streams on tuyere with heat insulation and on at least one serial tuyere without heat insulation, installed on same manifold. Upon achieving difference of said temperatures on tuyere with heat insulation to values on serial tuyere and if difference of flow rates of input and output water streams, cooling tuyere with heat insulation, within measurement error, moment of replacement of tuyere with damaged insulation is detected.EFFECT: use of invention enables to accurately determine moment of replacement of tuyere due to breakdown of its thermal insulation and provide safe operation of blast furnace.1 cl, 1 ex

Device and method (versions) for slag thickness measuring // 2604543
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and is intended to measure slag thickness on liquid metal surface. Device contains wire made from electrically conducting material, which can be melted under effect of heat at slag temperature, wherein wire has free end designed for immersion into slag. Device also comprises wire feed facilities, making it possible to move wire so, that its free end is vertically immersed into slag in accordance with preset trajectory. There is also measuring device to measure distance, which wire free end passes in period of time when wire is moved under action of supply device, and supply control device, wherein control device includes detector to detect contact between free end of wire and liquid metal surface.EFFECT: technical result is higher measurement accuracy.17 cl, 7 dwg

ethod and plant for continuous production of steel wire // 2604542
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. To improve mechanical properties of the wire and provide a homogeneous microstructure the steel wire manufacturing method involves production of the steel wire, heating up to the steel wire austenitizing temperature, patenting the steel wire, drawing the steel wire. Patenting the steel wire includes slow cooling of the said steel wire from the austenitizing temperature down to the first preset temperature, fast cooling of the wire to the second preset temperature, holding the wire at the specified second preset temperature.EFFECT: during the slow cooling the steel wire in fact retains its austenitic structure, at the subsequent fast cooling the steel wire is in better conditions to start a phase changing, wherein the austenitic structure is converted into a pearlite structure.16 cl, 6 dwg

ethod for production of continuously annealed ageless cold-rolled stock of ultra deep drawing // 2604081
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. To improve plastic characteristics of rolled stock, method includes smelting steel containing, wt%: C 0.005 or less, Si 0.02 or less, Mn 0.20 or less, S 0.012 or less, P 0.012 or less, Al 0.06 or less, N 0.006 or less, Ti 0.04-0.080, ratio of content of elements is determined by formula Ti=(5xC+3xS+4xN)±0.02, Fe and inevitable admixtures - balance, which is poured into slab. Slab is subjected to hot rolling at rolling beginning temperature 1,020÷1,080 °C and end temperature - 860÷920 °C, then performing accelerated cooling of rolled stock at collecting roller table to temperature of 670÷710 °C, then strip is cold rolled with reduction 60÷92 %, high-speed continuous annealing at temperature of 820÷860 °C, ensuring production of ferrite grain size of 22÷41 mcm, with further accelerated cooling and artificial ageing.EFFECT: improved plastic characteristics of rolled stock.1 cl, 6 tbl

Chemical removal of surface defects from textured electrical steel // 2604077
FIELD: metalworking.SUBSTANCE: invention relates to treatment of electrical steel coated with factory glass and having defects in the form of iron cusps. Method involves processing at least part of the surface of electrical steel coated with factory glass with an acid solution for a time sufficient to decrease average height of iron defects on the surface down to average height within the range from 0 % to 150 % of thickness of the factory glass coating without removing the factory glass coating. Method applies an acid solution containing an organic acid, and after the said treatment the electrical steel coated with factory glass is washed with water and dried.EFFECT: invention allows reducing the height of defects present onto a factory glass coated electrical steel in the form of iron cusps.22 cl, 61 dwg, 8 ex
Galvanized steel sheet for hot forming // 2603762
FIELD: metallurgy.SUBSTANCE: invention relates to production of galvanized steel sheet for hot forming. For improved sheet weldability galvanized steel sheet has chemical composition, wt%: C 0.02-0.58, Mn 0.5-3.0, solution. Al 0.005-1.0, elements, if necessary: Si equal to or less than 2.0, P equal to or less than 0.03, S, equal to or less than 0.004, N equal to or less than 0.01, Fe and admixtures - the rest. On the surface of steel sheet there is a coating layer and the Mn content in the section from the steel sheet boundary surface and the applied galvanic coating layer to the depth of 5 mcm is equal to or more than 0.3 wt%. Galvanic coating applied layer has specific weight of 40-110 g/m2 and comprises Al with concentration, equal to or less than 0.5 wt%, and specific content in the galvanic coating layer, equal to or more than 150 mg/m2.EFFECT: then galvanized steel sheet is subjected to hot forming at heating temperature of 700 °C or higher.17 cl, 2 tbl

ethod of melting metal in converter // 2603759
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly, to metal melting in converter. Method includes charging scrap, casting iron, blowing metal melt with oxygen, adding magnesium-containing slag-forming materials during blowing process, blowing slag left in converter after discharge of metal therefrom with nitrogen. Prior to blowing molten metal with oxygen, method includes determining amount of magnesium-containing slag-forming materials deposited during blowing based on predicted data on composition of slag before outlet of melt and value of slag corrosion of converter lining. Molten metal is then blown with oxygen, in direction of which is added magnesium-containing slag-forming materials. Metal is tapped from converter and before blowing slag left in converter with nitrogen, magnesium- and carbon-containing materials are deposited thereon in an amount of 1-3.0 and 0.3-1.0 t respectively. Magnesium- and carbon-containing materials used are dried dolomite and coke. Slag is blown with nitrogen for 1-8 minutes.EFFECT: decreased consumption of magnesium-containing slag-forming materials.3 cl, 1 ex

Ferrite stainless steel sheet, method for production thereof and use thereof, especially in exhaust systems // 2603519
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly, to ferrite stainless steel sheet, used for production of parts, subjected to high temperatures, in particular elements of exhaust systems of internal combustion engines. Said steel contains following substances, in wt%: trace amounts of ≤ C ≤ 0.03, 0.2 ≤ Mn ≤ 1, 0.2 ≤ Si ≤ 1, trace amounts of ≤ S ≤ 0.01, trace amounts of ≤ P ≤ 0.04, 15 ≤ Cr ≤ 22, trace amounts of ≤ Ni ≤ 0.5, trace amounts of ≤ Mo ≤2, trace amounts of ≤ Cu ≤ 0.5, 0.160 ≤ Ti ≤ 1, 0.02 ≤ Al ≤ 1, 0.2 ≤ Nb ≤ 1, trace amounts of ≤ V ≤ 0.2, 0.009 ≤ N ≤ 0.03, trace amounts of ≤ Co ≤ 0.2, trace amounts of ≤ Sn ≤ 0.05, rare-earth elements (REE) ≤ 0.1, trace amounts of ≤ Zr ≤ 0.01, iron and unavoidable impurities making the rest. Content of Al and rare-earth elements (REE) satisfy the relationship Al+30×REE≥0.15%, and content of Nb, C, N and Ti in % satisfy the relationship 1/[Nb+(7/4)×Ti-7×(C+ Ν)]≤3. Sheet has a completely recrystallized structure and average size of ferrite grain of between 25 and 65 mcm.EFFECT: higher resistance to corrosion under the action of water, urea and ammonia.7 cl, 3 dwg, 3 tbl

ethod for production of high-hardness wear-resistant sheet products // 2603404
FIELD: metallurgy.SUBSTANCE: invention relates to ferrous metallurgy, particularly to production of a new highly efficient type of metal products - thick-sheet wear-resistant low-alloy steel for heavy handling equipment. Method involves production of slabs from steel containing, wt%: 0.20-0.28 C, 0.15-0.30 Si, 0.75-1.30 Mn, 0.30-0.65 Cr, 0.85-1.55 Ni, 0.25-0.40 Mo, 0.02-0.06 V, 0.02-0.05 Al, 0.001-0.010 N, 0.10-0.20 Cu, 0.002-0.060 Nb, 0.002-0.010 Ti, 0.001-0.005 B, not more than 0.005 S, not more than 0.010 P, Fe - balance, heating, multipass hot rolling of sheets, tempering with water at temperature of 930-980 °C, tempering at temperature 150-250 °C.EFFECT: high hardness and strength while maintaining sufficient ductility and impact strength.1 cl, 4 tbl, 1 ex

ethod of making textured electrical steel sheet with low losses in iron // 2602694
FIELD: metal processing.SUBSTANCE: invention relates to production of sheet from textured electrical steel. To increase efficiency sheet manufacturing process sheet with thickness t surface is irradiated by electron beam in direction intersecting rolling direction, and irradiation energy E(t) is adjusted when meeting following ratio: Ewmin (0.23) x (1.61 - 2.83 x t (mm)) ≤ E(t) ≤ Ewmin (0.23) x (1.78 - 3.12 x t (mm)), where Ewmin (0.23) is radiation energy, at which losses in iron for material with sheet thickness t 0.23 mm are minimum.EFFECT: higher process efficiency.3 cl, 3 dwg, 1 tbl

ethod for treatment of waste gas containing carbon dioxide coming from the process of electrosmelting // 2601981
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used at treatment of waste gas containing carbon dioxide coming from the process of electrosmelting. Method involves exhaust gas afterburning using combustible gas, addition of hydrocarbon-containing gas to exhaust gas and conversion of carbon dioxide of exhaust gas at least partially into carbon monoxide and hydrogen, exhaust gas cooling in heat exchange process and use of carbon monoxide and hydrogen mixture for thermal needs.EFFECT: invention improves recovery of exhaust gas formed during electric arc furnace operation and simultaneously reducing emissions of carbon dioxide formed during melting.10 cl, 3 dwg

Notching device // 2601974
FIELD: melting furnace.SUBSTANCE: invention relates to design of a notch of a blast furnace for production of cast iron. Device comprises heat-resistant bricks located along the inner side of the furnace casing, a cylindrical housing passing through the furnace casing and directed to the heat-resistant bricks, and an annular sealing assembly located on the end of the housing near the heat-resistant bricks and containing the housing seal. Herewith the housing seal is arranged to provide an airtight seal of the housing along its periphery, and the seal of bricks - to provide an airtight seal of bricks along the entire periphery between the heat-resistance bricks and the sealing assembly.EFFECT: invention is aimed at elimination of gas leaks at the outlet of liquid cast iron.6 cl, 8 dwg

ethod of manufacturing rails of low-temperature reliability // 2601847
FIELD: metallurgy.SUBSTANCE: invention relates to ferrous metallurgy, in particular. Rails are rolled at mill with universal mill tandem at heating temperature for rolling in range of 1,100 to 1,200 °C, finish rolling is performed at temperature of 850-950 °C, and accelerated and differentiated cooling at head and rail foot is performed by air or air with admixture of water from temperature 720-850 °C at a rate of 1.5-6.0 °C/s to temperature of ≤ 620 °C, where in each specific case cooling rate at head differs from cooling rate at bottom. Said steel contains following substances, wt%: carbon - 0.72-0.78 and optionally additionally: from 0.15 to 0.60 chromium, from 0.10 to 0.60 nickel, from 0.05 to 0.15 vanadium, from 0.007 to 0.020 nitrogen.EFFECT: obtaining rails of low-temperature reliability with perlite microstructure, having high level of impact strength and impact drop strength at negative temperatures, as well as required system of mechanical properties and low level of residual stresses.1 cl, 3 tbl
 
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