etallurgy of iron (C21)

C   Chemistry; metallurgy(312744)
C21            etallurgy of iron(23017)
ethod of shot production from cast iron by processing steel chip // 2614227
FIELD: metallurgy.SUBSTANCE: steel chip is mixed with graphite, the mixture is placed in the holes of the die and heated in the oven upto the temperature of 1150-1200°C, providing carburization of steel to convert it into the cast iron, melting the cast iron, and then perform its cooling in water to obtain the shot.EFFECT: it is provided the processing of steel chips to produce the shot with the structure of white cast iron.2 dwg, 1 ex

Inclinable converter // 2614225
FIELD: metallurgy.SUBSTANCE: invention can be used in design of suspension for tilting converter housing which comprises a housing defining the position of the first axis (X), a support ring with a common axis with the housing, set at a distance from the said housing, wherein the support ring has two supporting journals located diametrically opposite and determining the position of the second axis (Y), perpendicular to the first axis (X), and providing a converter rotation about the said second axis, the first and the second suspension devices connecting the said housing to the support ring. Each first suspension device comprises a central structure attached to the housing; the first side structure disposed at the first side of the said central structure and attached to the surface of support ring; the second side structure disposed at the second side of the said central structure opposite to the said first side and attached to the surface of support ring. The first and the second side structures comprise respectively two first stops located at a distance from each other, and a group of elastic cross pieces arranged next to each other and extending parallel to each other, the ends of which are supported by two first stops.EFFECT: invention allows to create a suspension structure for housing of converter connecting said housing with a support ring to avoids shock and overload in these areas, and to compensate for thermal expansion and ensure reliability of said suspension in contaminated environment and high temperatures.12 cl, 5 dwg
ethod for control of air tuyere of blast furnace with thermal insulation from blasting channel // 2613834
FIELD: metallurgy.SUBSTANCE: in method for control of heat insulation state from blasting channel of air tuyere of blast furnace, difference between consumption of incoming and outgoing flow of cooling water for tuyere is defined, average value of incoming and outgoing flows temperatures difference for certain intervals and temperature difference RMS deviation from an average value are calculated, average value of the temperature difference over the current time interval is compared with average value of temperature difference over the preceding time interval, current values of consumption difference of incoming and outgoing flow of cooling water for tuyere are compared with the overall accuracy of measurements of flowmeters, and in case of increase of average value of temperature difference over the current time interval relative to average value of temperature difference over the preceding time interval to a value larger than RMS deviation over the current time interval at difference value of the said consumption of water flows withinthe overall accuracy of measurements of flowmeters, start of heat insulation destruction is recorded, and in case if value of the said water flows difference is larger than the overall accuracy of measurements of flowmeters, tuyere heat insulation burnout is recorded.EFFECT: invention allows to determine start of thermal insulation destruction from blasting channel of air tuyere of blast furnace.2 cl, 1 ex
Deposphorization method of iron ores and concentrates // 2613833
FIELD: metallurgy.SUBSTANCE: method includes the melting of iron ore concentrate in the furnace and dephosphorization of iron-containing oxide melt. The melt temperature is adjusted to a temperature of 1000-1800°C and dephosphorization is performed by blowing of the melt with gaseous carbon monoxide.EFFECT: invention allows to obtain a cast iron with low phosphorus content.3 cl, 1 ex, 1 tbl

High-strength thin-walled steel pipes welded by electric resistance welding with high impact strength and method of their production // 2613824
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, specifically to thick-walled steel pipes, which can be used for drilling or oil and natural gas transportation. High-strength thick-walled steel pipe, welded by electric resistance welding, contains, wt%: C 0.025–0.084, Si 0.10–0.30, Mn 0.70–1.80, P 0.001–0.018, S 0.0001–0.0029, Al 0.01–0.10, Nb 0.001–0.065, V 0.001–0.065, Ti 0.001–0.033, Ca 0.0001–0.0035, N 0.0050 or less, O 0.0030 or less, if necessary, at least, one element, selected from: B 0.0030 or less, Cu 0.001–0.350, Ni 0.001–0.350, Mo 0.001–0.350 and Cr 0.001–0.700, Fe and incidental impurities are rest. Pcm parameter, characterizing microstructure after pipe welded seam fast cooling and defined by expression Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5·B, is equal to 0.20 or less. Microstructure includes 90% or more of quasi polygonal ferrite by area, having grain size of 10 mqm or less in steel pipe main part and in part, welded by electric resistance welding.EFFECT: pipe is characterized by high values of low-temperature impact strength and resistance to hydrogen cracking, as well as high reliability of pipe welded part.10 cl, 3 dwg, 5 tbl, 2 ex

ethod of making plate of textured electrical steel // 2613818
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. To reduce losses in iron and provide small fluctuations of value of losses in iron method involves hot rolling of steel slab, containing, wt%: C 0.002–0.10, Si 2.0–8.0 and Mn 0.005–1.0, for producing hot-rolled sheet, if necessary annealing in hot zone conditions of hot-rolled steel sheet, single, or double, or repeated cold rolling with intermediate annealing between them for producing cold-rolled sheet of final thickness, primary recrystallization annealing in combination with carbon-removing annealing of cold-rolled sheet, application of annealing separator on surface of steel sheet and final annealing, fast heating is performed at rate of no less than 50 °C/s in range of 100–700 °C in process of heating of primary recrystallization annealing, steel plate is held at any temperature within 250–600 °C for 0.5–10 s 2–6 times.EFFECT: reduced losses in iron.9 cl, 4 tbl, 4 dwg
ethod of producing hot-rolled sheets from constructional low-alloy steel with guaranteed maintenance of construction perfomance properties at low temperatures (versions) // 2613269
FIELD: metallurgy.SUBSTANCE: while producing thick sheets, austenitization of continuously cast ingot is carried out at 1200-1220 °C, finish rolling starts at 780-820 °C and finishes at 740-760 °C with a total reduction of at least 80% to a final sheet thickness of not more than 15 mm. Steel contains the following chemical composition, wt %: 0.17-0.20 C, 0.15-0.25 Si, 1.25-1.40 Mn, S≤0.006, P≤0.018, Cu≤0.10, Nb≤0.01, V≤0.01, 0.02-0.05 Al, Ti≤0.03, Fe inevitable impurities - the rest. While producing sheets of 15-25 mm thickness from the steel of the same composition, austenitization of continuously cast ingot is carried out at 1200-1220 °C, finish rolling starts at 830-860°C and finishes at 760-790 °C with a total reduction of at least 75%, wherein after the finish rolling the sheets are rapidly cooled to 620-670 °C. Production versions of the sheets of 40-80 mm, 80-120 mm, 120-160 mm thickness with the same steel composition are also presented. In all versions of the method, the rolling at the draft stage is carried out with one-time reductions of at least 7%.EFFECT: maintenance of perfomance properties at low temperatures.12 cl, 3 tbl
ethod of producing hammer for shredding plant // 2613266
FIELD: metallurgy.SUBSTANCE: first, hammer workpiece of rectangular shape is cut out of continuously cast slab at a temperature not less than 400°C. The workpiece is heated to 1100-1300°C, subjected to press forging, heated in a stove to 820-840°C at a rate of not more than 80°C/h, held for 3÷4 hrs and cooled with the stove to a temperature of 300-400°C, then the hammer of the required size is cut out of the original workpiece at the gas-cutting machine, the mounting bore of the hammer is subjected to mechanical processing and heat treating of the hammer is carried out by heating it to Ac3+30÷50°C at a rate of not more than 80°C/h and holding at this temperature for 3÷4 hrs, cooling of the hammer working part in a water bath and subsequent air cooling, heating of the hammer to 150-250°C and holding for 4÷6 hrs and subsequent air cooling, wherein the slab is made of 40HS2N2M steel.EFFECT: increased durability of the hammer, increased productivity and decreased exhaust of the hammer mounting bore.2 cl
ethod of producing hot-rolled sheets from low-alloyed tube steel of k60 strength grade for longitudinal electric-welded pipes // 2613265
FIELD: metallurgy.SUBSTANCE: continuously cast steel ingots are produced containing, in wt %: 0.07-0.10 C, 0.20-0.35 Si, 1.60-1.75 Mn, not more than 0.10 of Cr, not more than 0.30 of Ni, not more than 0.20 of Cu, 0.010-0.025 Ti, 0.065-0.090 V, 0.040-0,060 Nb, not more than 0.5 of Mo, not more than 0.008 of N, 0.020-0.050 Al, not more than 0.004 of S, not more than 0.015 of P, Fe and inevitable impurities - the rest and having a total content of V+Ti+Nb not more than 0.15%, then the heating of the ingot to 1200±10°C, rough rolling with a regulated roll reduction in thickness, multiple of 4-5 thickness of the finished sheet, cooling down, finish rolling at the start temperature of 740-780°C and - and the finish temperature of 730-770°C, accelerated cooling to 580-680°C and air cooling are carried out to obtain a structure mainly consisting of bainite and ferrite.EFFECT: ensuring of the given mechanical properties of the finished steel.4 cl, 3 tbl
Production method of hot-rolled rolled stock from low-alloy steel // 2613262
FIELD: metallurgy.SUBSTANCE: method includes slabs heating in the temperature range of 1,230-1,250°C, subsequent multipass reversible rough and final rolling with regulated temperatures of the rolling beginning and end, and the rough rolling is completed at the temperature of not more than 1,000°C, the final rolling is started at the temperature in the range of 960-1,000°C and completed in the temperature range of 820-880°C. Final rolling includes 7-9 runs. Slab is made of steel containing in wt %: C=0.22-0.26, Si=0.30-0.40; Mn=0.75-1.10, Al=0.01-0.035, Nb=0.03-0.05, Cr not more than 0.3, Ni not more than 0.3, Cu not more than 0.3, S not more than 0.010, P not more than 0.015, N not more than 0.008, V not more than 0.05, Ti not more than 0.05, Fe - the rest. The end temperature of the final rolling is 820-850°C for sheets with thickness of 8-20 mm and 850-880°C for sheets with thickness 20.1-50.0 mm. In the hot-rolled sheet, a ferrite-pearlite structure is provided for with a grain size not larger than 9 points.EFFECT: ensuring a high level of heat stability and impact toughness.3 cl, 3 tbl, 1 ex

ethod of blast furnace operation and method of molten cast iron production // 2613007
FIELD: metallurgy.SUBSTANCE: invention refers to metallurgy, namely method of molten cast iron obtainment in a blast furnace by reduction of iron oxide material. Method involves first stage where cake loading rate is controlled along with monitoring of temperature Ttop in the top furnace part, second stage where coal dust injection rate is controlled along with monitoring of apparent velocity u of furnace gas and temperature Ttop in the top furnace part, third stage where saturation of oxygen-saturated air with oxygen is controlled along with monitoring of combustion temperature Tf in the tuyere and temperature Ttop in the top furnace part, and fourth stage where a need to adjust injection rate of oxygen-saturated air is determined on the basis of apparent velocity u of furnace gas.EFFECT: increased yield of blast furnace, maintenance of stable operation.22 cl, 5 dwg, 1 tbl, 15 ex
Device for rim cooling during thermohardening of rail wheels // 2612479
FIELD: metallurgy.SUBSTANCE: device comprises 2 bearing rollers, 2 supporting rollers and sprayers for coolant feed positioned between them. Sprayers for the cooling of the side surfaces of the rim positioned between the bearing rollers are made single-plane, and sprayer for cooling of the rim rolling surface positioned between the bearing and supporting rollers is made featuring the repetition of curvature of the rim rolling surface.EFFECT: reduction of cooling water consumption, facilitation of its removal, disposal of steam jacket formation between the quenching surface and cooling medium, ensuring that the cooling rates of the rim metal are below critical over the entire section to obtain structure of thin-platy perlite over the entire thickness of the rim and the exclusion of water entry in the wheel disks of adjacent devices.2 dwg, 6 tbl
ethod for producing structural element made of steel by means of thermoforming // 2612478
FIELD: machine building.SUBSTANCE: method of manufacturing a structural element made of steel, amenable to transformation during hot forming comprises heating the cut steel sheet metal plate to the austenitizing temperature, moulding secured after moulding is at least partially martensitic structure, while in rapid cooling of the sheet or plate after heating to the austenitizing temperature, to obtain a plate with conditioned at least partly martensitic, and then reheating is carried out to a temperature below ac1-temperature conversion and forming at this temperature.EFFECT: increase strength and corrosion resistance.17 cl

etallic iron producton method // 2612477
FIELD: metallurgy.SUBSTANCE: invention refers to the metallic iron production method. Mixture agglomerate is formed comprising iron oxide material and a carbon-containing reducing agent, the resulting agglomerate is introduced into the heating furnace with a movable hearth and reduced by heating. The reduced product comprising metallic iron and slag is discharged from the heating furnace of the movable hearth, crushed using a crusher, separated by screening using a screen having holes with size of 2-8 mm on the material consisting of coarse grains, and the material composed of fines. Thus the volume density of the material consisting of coarse grains is from 1.2 to 3.5 kg/l. The resulting material consisting of coarse grains is crushed using an impact crusher, sorted using a separator, with metallic iron being collected.EFFECT: invention enables continuous and efficient collection of metallic iron product without reducing the grain size.39 cl, 29 dwg, 24 tbl, 23 ex

ethod of direct reduction of materials containing metal oxides to produce melt metal and device for carrying out method // 2612330
FIELD: metallurgy.SUBSTANCE: invention refers to metallurgy, in particular to the methods of producing metal by direct metal reduction from oxide-containing materials with a solid reducing agent. Metallization is performed by direct reduction of metal oxides and melting the resulting product. Oxide-containing materials in a mixture with a solid reducing agent are continuously fed through a cavity of hollow electrode into a zone of electric arc furnace located between the bottom and the hollow electrodes, and the direct reduction of metal oxides and their melting are carried out by means of Lenz-Joule heat generated in the interelectrode space of electric arc furnace comprising the bottom electrode and at least one hollow electrode mounted vertically with the possibility of lowering connected to a current source and whose inner passage is formed expanding downwardly. Oxide-containing materials and the solid reducing agent are fed into the electrode cavity in the rounded or granular state and maintained in it at a height of from 1 to 10 diameters in the electrode cavity depending on the average granules diameter.EFFECT: invention is directed to increase the intensity of the reduction process in the high temperature zone.6 cl, 1 dwg
ethod of steelmaking in basic oxygen furnace // 2612246
FIELD: metallurgy.SUBSTANCE: method involves solid charge feeding, hot-metal charging, further oxygen purging of the bath, additing slag-forming materials and solid oxidizers. Metal scrap and semi-finished product consisting of an iron-carbon alloy and iron oxides for metal conversion are used as the solid charge. The semi-finished product for metal conversion is produced in the form of compressed packets, inside which capsules filled with iron oxides with the iron content of at least 55% and moisture of no more than 12% are put prior to compression. Mass fraction of oxides in the packet is 35-45%, and the mass fraction of compressed packets is 20-45% of the total weight of the scrap metal and compressed packets. Containers of ferrous materials are used as capsules.EFFECT: reduced scrap metal consumption and reduced steelmaking cost.1 tbl, 1 ex
ethod for treatment of products of structural metallic materials // 2612245
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. To increase reliability of heat-treated products of structural materials regardless of the operating load direction method comprises heat treatment of a product and subsequent treatment by a pulsating gas flow at room temperature successively in two or more directions to ensure isotropy of properties relative to the directions of test operating loads.EFFECT: higher reliability of heat-treated products of structural materials.1 cl
Steel sheet and method of steel sheet // 2612109
FIELD: metallurgy.SUBSTANCE: to provide improved deformation capacity of a steel, method comprises melting steel containing, wt%: carbon – 0.04–0.08, silicon – 0.10–0.30, manganese –1.60–1.85, chromium – not more than 0.30, nickel – 0.20–0.40, molybdenum – 0.10–0.25, copper – not more than 0.30, aluminium – not more than 0.05, niobium – 0.03–0.06, titanium – 0.010–0.020, vanadium – not over 0.01, sulphur – not more than 0.003, phosphorus – not more than 0.013, balance is iron and unavoidable impurities to produce a slab, slab is heated to 1,100–1,200 °C, rough rolling at 950÷1,050 °C, cooling in air, finish rolling at 700÷820 °C to required thickness of sheet with total reduction of 75–85 %, cooling at a rate of 20÷35 °C/s to 300÷500 °C and cooling on air to temperature not higher than 150 °C.EFFECT: disclosed is a method of producing a steel sheet with thickness of 15–40 mm with yield point higher than 480 MPa.2 cl, 3 tbl

Air hardenable shock-resistant steel alloys, methods of making alloys and articles including alloys // 2612105
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, specifically to air hardenable steel alloy, used in making components of protection against shock wave. Alloy contains following, wt%: from 0.18-0.26 of carbon, from 3.50 to 4.00 nickel, from 1.60 to 2.00, chromium, from 0 to 0.50 molybdenum, from 0.80 to 1.20 manganese, from 0.25 to 0.45 silicon, from 0 to less than 0.005 titanium, from 0 to less than 0.020 phosphorus, from 0 to 0.005 boron, from 0 up to 0.003 sulphur, balance is iron and unavoidable impurities. Alloy has Brinell hardness ranging from 352 HBW to 460 HBW.EFFECT: achieving combination of high strength, medium hardness and impact strength.21 cl, 7 dwg, 6 tbl, 7 ex
ethod of hot-rolled stock preparation for production of hardware fasteners // 2612101
FIELD: technological processes.SUBSTANCE: invention relates to pearlitic grade structural steels graded hot-rolled products thermomechanical processing. To ensure required strength, plastic and strength characteristics of calibrated rolled metal, rolled stock is annealed at 770–790 °C with holding for 3–4 hours, cooling with furnace to 660–680 °C with holding in furnace for 3–4 hours, cooling with furnace to temperature of 160–170 °C with holding for 2–3 hours, cooling to ambient temperature, primary drawing with reduction ration of 17–19 %, isothermal treatment by patenting in bath with lead at temperature of 360–370 °C, cooling in air, secondary drawing with reduction ratio of 5–6 %.EFFECT: invention can be used for production of high-strength fasteners form it.1 cl, 1 tbl, 1 ex

Texture sheet of electric steel and method of its production // 2611457
FIELD: metallurgy.SUBSTANCE: invention refers to metallurgy. To reduce roughness of texture sheet surface of electric steel and magnetic loss, a sheet features closure domain area spreading linearly along steel sheet surface at 60° to 120° angle against rolling direction, where closure domain area is formed at regular intervals s (mm) in the rolling direction so that h ≥ 74.9t+39.1 (0.26 ≥ t); h ≥ 897t-174.7 (t > 0.26); (w×h)/(s×1000) ≤ -12.6t+7.9 (t > 0.22) and (w×h)/(s×1000) ≤ -40.6t+14.1 (t ≤ 0.22), where h (µm) is depth, w (mkm) is width of closure domain area.EFFECT: this document describes manufacturing method for texture sheet of electric steel.4 cl, 1 tbl, 13 dwg
ethod of producing high-strength rolled product of austenite stainless steel with nanostructure // 2611252
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, particularly, to metal forming, specifically to production of high-strength rolled product of austenite stainless steel with a nanocrystalline structure, which can be used as structural material. Method of making rolled product comprises hot forging at 1,373 K to true straining ε=0.5 with subsequent cooling in water, obtained semi-products undergo warm rolling into a sheet to true straining ε=3 at 473–673 K, which prevents martensitic transformation.EFFECT: technical result consists in production of rolled product of austenite stainless steel with nanocrystalline structure and improved strength properties, yield strength is more than 1,000 MPa.1 cl, 2 dwg, 1 tbl
Processing method of metallurgical raw materials and device for such method implementation // 2611229
FIELD: metallurgy.SUBSTANCE: method involves the preparation of the initial molten slag bath by filling a mobile capacity with slag, discharged from various metallurgical units. Then the supply to the molten stock is performed, consisting of the feedstock, solid carbonaceous material and fluxes, and the melt blowing by air and heating gas. The device consists of a container with the melt, immersion chamber without bottom, connected with a suction device and the movement mechanism. The chamber dome has the integrated multichannel vertical double-level tyere-burner, the stock is supplied along its central channel, injected by the air, and along the periphery ones - the air and heating gas, directly just below the level of the initial bath of molten slag.EFFECT: efficiency increase of the reduction smelting in the liquid slag bath, while reducing the number of used units, reduction of capital and energy costs, improved environmental performance.11 cl, 1 dwg

etallurgical plant with efficient use of waste heat // 2610999
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used in metallurgical complex for steel production. System has a unit for melting and/or reduction of metals and a gas generating plant which generates exported gas, wherein carbon dioxide and/or water contained in exported gas in a separation device is at least partially removed from exported gas, wherein obtained gas before feeding into said plant is heated in a furnace device by burning furnace gas, furnace gas is fed into furnace device in a volume, which is more than required for heating obtained gas. Heat energy obtained when burning furnace gas is used inside furnace device for production of steam and/or relative to gas flow of combustion gas generated during combustion of furnace gas, and after furnace device for heating and/or drying raw materials, supplied to gas generating plant and/or installation for melting and/or reduction of metals.EFFECT: invention allows effective use of thermal energy produced in a metallurgical complex, as well as combustible gases.18 cl, 3 dwg
ethod of increasing strength properties of welded joints made by friction welding with mixing // 2610996
FIELD: technological processes.SUBSTANCE: invention can be used to improve technological and operational characteristics of welded structures and complex parts made from thermally strengthened aluminium alloys obtained by friction welding with mixing, in particular, in making various structures for automotive industry, for example, for production of automotive wheel discs. First postwelding thermal treatment is performed to a solid solution with holding in the furnace at the temperature from 450 to 580 °C for 30–60 minutes with subsequent quenching in water. Then postwelding artificial ageing is performed within the temperature range from 160–205 °C for 1–18 hours.EFFECT: method enables to obtain welded structures from thermally strengthened aluminium alloys with high mechanical properties and an adhesion coefficient close to the level of the main material.1 cl, 1 tbl
anufacturing method for work-hardened steel parts with coating and pre-coated sheets for producing these parts // 2610995
FIELD: metallurgy.SUBSTANCE: invention relates to a cold-rolled and annealed sheet with thickness of 0.5-2.6 mm consisting of a steel substrate for heat treatment and metal pre-coating on at least two major surfaces of the steel substrate. The composition of the steel substrate contains, wt %: 0.07≤C≤0.5, 0.5≤Mn≤3, 0.02≤Si≤0.5, 0.01≤Cr≤1, Ti≤0.2, Al≤0.25, S≤0.05, P≤0.1, 0.0005≤B≤0.010, if required 0.0005≤Ca≤0.005, everything else is iron and unavoidable impurities including oxygen containing O0. The substrate contains a decarburized area on the surface of each two major surfaces, the deapth of which p50% is 6-30 micrometers, where p50% is the depth at which the carbon content is 50% of the mentioned C content. The sheet does not contain an iron oxide layer between the mentioned substrate and metal pre-coating and, under the interface between the pre-coating and mentioned substrate at the depth of 0-5 micrometers, beginning with the specified interface, has an average content of Om. Where Om/O0 is more than 15.EFFECT: high strength and bendability of sheets.22 cl, 16 dwg, 2 ex

Ultrahigh-strength multiphase steel with improved properties during production and processing // 2610989
FIELD: metallurgy.SUBSTANCE: invention relates ultrahigh-strength multiphase steel having a particular composition, as well as to production a cold- or hot-rolled steel strip, wherein required multiphase microstructure is generated during continuous annealing. For uniform distribution of mechanical properties of strip, having different cross section and thickness, cold- or hot-rolled strip is heated to temperature of 700–950 °C, then heated steel strip is cooled at a rate of 15–100 °C/s from annealing temperature to first intermediate temperature of 300 °C to 500 °C, then steel strip is cooled at a rate of 15–100 °C/s to a second intermediate temperature of 200 °C to 250 °C; then steel strip undergoes cooling in air at a rate of 2 to 30°C/s to ambient temperature or is cooled at a rate of 15–100 °C/s from first intermediate temperature to ambient temperature.EFFECT: obtaining maximum strength of steel.15 cl, 6 dwg
Bituminous desulfurizing agent // 2610987
FIELD: metallurgy.SUBSTANCE: agent contains calcium oxide, bitumen and from 0.01 to 10 wt % of at least one flowability-imparting agent selected from the group consisting of polyatomic alcohols, longflame coals, silicone oils and mixtures thereof. The agent contains no calcium carbide, magnesium and magnesium alloy. The agent is produced by mixing calcium oxide, bitumen, at least one flowability-imparting agent and by grinding the resulting mixture to a powder with a grain size with which at least 80 wt % of the powder is presented by particles with size less than 32 mcm, at least 85 wt % of the powder is presented by particles less than 45 mcm, at least 90 wt % of the powder is presented by particles less than 63 mcm and at least 95 wt % of the powder particles is presented by particles less than 90 microns.EFFECT: invention allows to produce an agent based on calcium oxide, which provides for high efficiency of pig iron or steel alloy desulfurizing.17 cl, 2 ex
ethod of steel production in electric arc furnace // 2610975
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used in production of steel in an electric arc furnace. Method involves loading into the furnace working space a solid metal charge and solid carbon-containing materials, the charge melting by means of electric arcs and carbonization of the metal with the solid carbon-containing materials during the melting, tapping the metal and slag from the furnace. For additional carbonization of the metal during melting the furnace working space is fed with iron oxides and a carbonaceous material in an amount sufficient for obtaining a high-carbon carbonator in the form of a liquid phase of the reduced in the iron arcs with carbon combustion zone in free and dissolved forms. Herewith the flow rate of iron oxides and the carbonaceous material enabling to obtain the high-carbon carbonator for the melting is not less than 3 % from the metal charge weight.EFFECT: invention increases output of liquid metal due to regulation of carbon content during melting, provides higher degree of metal carbonization since the very beginning of melting and reduction of iron loss into slag and smoke.10 cl, 1 tbl
Treatment method for invar alloy based on iron-nickel system // 2610654
FIELD: metallurgy.SUBSTANCE: method involves heating to 830-850 °C, cooling in water, additional cooling to a temperature below starting point of γ→α transformation, heating to the starting point of reverse α→γ transformation, further heating to the end point of α→γ transformation, followed by heating at a rate of 10 °C/minute or higher to a temperature exceeding the end point of α→γ transformation by 10÷100 °C, and cooling in the air. Further heating in the α→γ transformation range is performed at a rate of 0.2÷3 °C/minute. After air cooling, additional heating within 500-700 °C range and isothermal ageing for 15 minutes to 10 hours are performed, followed by air cooling.EFFECT: reduced temperature of the start of martensitic transformation of Mn alloys and extended temperature range.2 ex
ethod of ore-thermal furnace heating // 2610650
FIELD: metallurgy.SUBSTANCE: invention refers to metallurgy and can be used in obtainment of silicon, ferrous and non-ferrous metal alloys in ore-thermal electric furnaces after repair, equipped with reactive power compensation aggregates. After halts for repair, a furnace for ore melting in the presence of reducing agents and reactive power compensation aggregate are activated simultaneously, and furnace power factor is raised gradually by activation of capacitor bank sections of the reactive power compensation aggregate with 2-8 hour interval for each boost of power factor, and the number of activated capacitor bank sections is gradually increased from 2 to 12.EFFECT: reduced loss of active power of furnace during power gain after long-term standstills, resulting in increased performance of furnace.1 tbl
Centrifugally cast composite roller and way of its manufacturing // 2610645
FIELD: metallurgy.SUBSTANCE: present invention relates to composite rollers used in rolling process. Centrifugally cast composite roller comprises an outer layer made of cast iron, comprising, by wt %: 2.7-3.5 C, 1.5-2.5 Si, 0.4-1.0 Mn, 3.7-5.1 Ni, 0.8-2.2 Cr, 1.5-4.5 Mo, 2.0-4.5 V and 0.5-2.0 Nb, remaining Fe and unavoidable impurities, wherein the weight ratio of Nb/V is 0.18-0.65, and the weight ratio of Mo/V is 0.7-2.5, and the iron structure includes calculating the square phase 15-45%, 1-10% cementite and graphite phases, and an inner layer made of cast iron, is metallurgically bound to the outer layer; thus suitable for use in the rolling region of the outer layer depth of 10 mm or more, the surface has no dendrites segregated bainite and/or martensite having a diameter of 1.5 mm or more.EFFECT: document describes the structure and method of manufacturing centrifugal composite roller.9 cl, 9 tbl, 7 dwg

ethod of making plate of textured electrical steel // 2610204
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, namely to production of sheet of textured electrical steel, used for making cores of transformers and electric generators. Steel slab including, in wt%: C: 0.04–0.12, Si: 1.5–5.0, Mn: 0.01–1.0, soluble Al: 0.010–0.040, N: 0.004–0.02, one or both of S and Se: in total 0.005–0.05, heated to temperature no less than 1,250 °C and subjected to hot rolling for producing hot-rolled sheet with thickness no less than 1.8 mm. One-, two- or multiple cold rolling is made with intermediate annealing between them for producing cold-rolled sheet with final thickness of 0.15–0.23 mm, then primary recrystallization annealing and final annealing are made. Ratio of soluble Al to N in steel slab (soluble Al/N) and final thickness d (mm) satisfy equation 4d+1.52 ≤ soluble Al/N ≤ 4d+2.32. Steel sheet in process of heating of final annealing is held at temperature of 775–875 °C for 40–200 hours, and then heated in temperature range of 875–1,050 °C at heating rate 10–60 °C/h for secondary recrystallization and purification.EFFECT: obtaining extremely thin sheets of grain-oriented electrical steel with low losses in iron and small deviations in roll.9 cl, 2 dwg, 4 tbl, 2 ex
ethod of processing metastable austenitic steels by procedure of intensive plastic deformation // 2610196
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used, in particular, for manufacturing items and structures for chemical industry, energy, etc. The method of processing metastable austenitic steels includes stepwise intensive plastic deformation with decreasing the temperature of each subsequent stage, whereing the stepwise intensive plastic deformation is carried out with decreasing the temperature in the range of 450-20°C with the total true deformation degree 6-8 up to obtaining the fully austenitic nanocrystalline structure.EFFECT: invention provides increased strength characteristics and corrosion resistance of metastable austenitic steels, while maintaining a sufficient level of plasticity.1 ex

Austenitic and austenitic-ferritic steel processing method // 2610096
FIELD: metallurgy.SUBSTANCE: method includes ultrasonic non-abrasive steel surface treatment and final surface plastic deformation. Sonication austenitic steels tratement is carried out with the tool pressing force to the surface of 10-12 N and oscillation frequency of 15-20 kHz, forming the surface layer of a two-phase structure with a dislocation density⋅ of 2.5-3.01010 cm-2 consisting of 78-83 % deformation martensite and 17-22 % austenite, and ferrite-austenite steels - with a pressing force to the surface of 15-20N and ultrasonic oscillations frequency 20-25 kHz forming in the surface strengthened layer of a three-phase structure with a dislocation density⋅ of 5.5-6.0 1010 cm-2 comprising 47-53 % ferrite, 40-43 % deformation martensite and 7-10 % austenite. Austenitic steel finish deformation is carried out with compression, providing a hardening depth 70-80 % of the strengthened layer thickness after ultrasonic treatment and forming on the surface of the two-phase structure with the dislocation density⋅ of 6.5-7.0 1010 cm-2 consisting of 84-90 % deformation martensite and 16-10 % austenite, and ferrite-austenite steel - three-phase structure with the dislocation density⋅ of 9.0-9.5 1010 cm-2 comprising 47-53 % ferrite, 44-48 % deformation martensite and 3-5 % austenite.EFFECT: increased steel structural strength.3 cl, 4 dwg, 4 tbl, 7 ex
ethod of producing regular grain-oriented silicon steel with high magnetic induction // 2609605
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, specifically to production of grain-oriented silicon steel. Method includes melting and continuous casting of steel to produce a slab, wherein content of N at melting step is controlled at level of 0.002–0.014 wt%. Method includes hot rolling and cold rolling to obtain a sheet of final thickness. Method includes decarbonisation, annealing and treatment by nitriding, wherein content of embedded nitrogen [N]D satisfies expression: 328–0.14a–0.85b–2.33c ≤ [N]D ≤ 362–0.16a–0.94b–2.57c, where a is content of Als at melting step, in ppm; b is content of N at melting step, in ppm; c is size of primary grains, in mcm. Coating of magnesium oxide is applied on surface of sheet, annealed and insulating coating is applied.EFFECT: steel has high values of magnetic induction B8 of not less than 1,88 T.6 cl, 5 tbl, 29 ex
Gas outlet channel for steel making unit // 2609588
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, in particular, to gas outlet channel of a steel making unit. Gas outlet channel includes at least one sleeve filter with a smoke exhauster, as well as dust-laden gas manifold, cleaned gas manifold and a flue gas gathering manifold, combining bag filters and smoke exhausters into a single system with common dust discharge system. Gas duct from steel-making unit is equipped with series-installed carbon oxide afterburning chamber, water-cooled gas duct, dust-collecting chamber and sucking control valve, electrically connected to a temperature sensor. At inlet pipes of dust-laden gas and outlet pipes of cleaned gas, connecting bag filters with dust-laden gas manifold and cleaned gas manifold, as well as on suction and discharge pipes of smoke exhausters there are cutoff valves.EFFECT: higher reliability of gas outlet channel and efficiency of cleaning process gases.4 cl, 1 dwg

Skip filling system for blast furnace // 2609118
FIELD: metallurgy.SUBSTANCE: invention refers to metallurgy, particularly to skip filling system of a blast furnace. The system includes skip hoist, two skips, cables, skip bridge where two skip stoppers and six cable guiding pulleys are installed, with two pulleys mounted immobile in the middle part of the skip bridge and four pulleys mounted at the top overhanging part of the skip bridge. The system includes also two cable pull compensation devices mounted at the top overhanging part of the skip bridge in blast furnace charging zone, each device including one cable guide pulley on a base mounted on the case. A drive enabling vertical lift of the base and pulley is located below the case.EFFECT: enhanced reliability of system operation.2 cl, 6 dwg

System of energy optimization for plant for production of metals by direct reduction of ore // 2609116
FIELD: metallurgy.SUBSTANCE: invention relates to device (3) for direct reduction of ore, direct-reduced iron in particular. Plant (3) contains reducing reactor (12), device (7, 7a, 7b) for separation of gas mixtures with coupled pressure device (4, 4a, 4b), gas heating device (10) connected upstream of reducing reactor (12). Part of process gas (2, 2a, 2b) is supplied via supply pipeline from one plant (1, 1a, 1b) for melting of cast iron, in particular plant for reduction smelting. Plant (3) is made with possibility of conversion of pressure difference between device (7, 7a, 7b) and reducing reactor (12) into energy suitable for use in injection devices (4, 4a, 4b, 15, 15a, 15b) coupled with device (7, 7a, 7b). Wherein between device (7, 7a, 7b) and gas heating device (10) there is turbine (8, 8a, 8b), in particular, turbine expander.EFFECT: invention provides rational use of unused pressure difference, preventing loss of recycled gas recovered from plant for production of cast iron and reduced power consumption.18 cl, 3 dwg

ethod and device for affecting release of reaction gases in metallurgical vessel // 2608940
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. According to proposed method release of gases (4) of reaction in metallurgical vessel is affected for creation of melted metals from charged materials containing scrap (1) and cast iron (3). Wherein gases (4) of reaction are collected in piling exhaust hood (5) and supplied into exhaust pipeline (6) of dust-catching plant. Method is characterized by measurement of instantaneous reaction gas temperature in piling exhaust hood (5), instantaneous flow rate of reaction gases in exhaust pipeline (6) is measured, reaction gas temperature is measured at point of measuring instantaneous flow rate of reaction gases at moment of time for measuring instantaneous reaction gases flow rate. Considering values of above parameters instantaneous heat power of reaction gases (4) is calculated for regulation of amount of supplied materials during raw material loading in metallurgical vessel. Invention relates to device affecting release of reaction gases (4) according to method according to invention.EFFECT: technical result is increase of gas collection formed as a result of reaction.10 cl, 2 dwg
Reinforcement bar for fabrication of metal grids and frames // 2608927
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. To improve operational properties reinforcement bar of strength class 500–600 N/mm2, diameter 5.5–22 mm, spooled in bundle, is made of hot-rolled steel with carbon content of no more than 0.24 wt%, reinforced by cold non-monotonic deformation accumulated by sign-variable flexure. Rolled section has actual yield strength no less than 500 N/mm2, but does not exceed standardized one by more than 1.2 times, rupture strength to yield point 1.15–1.35, relative uniform elongation at maximum force gap no less than 7.0 %, tolerance for linear mass in negative field from rated value up to 6 % and rolling surface without scale, wherein bundle is formed by power line winding with relative density of 65–80 % and weight of 1.5–8.0 t.EFFECT: invention is aimed at creation of hardened reinforcing bar for making gauzes and frames for reinforcing concrete structures of low-carbon steel.1 cl, 4 tbl

Twip and nanotwinned austenitic stainless steel and its production method // 2608916
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, namely to production of austenite stainless nanotwinned TWIP steel. Austenitic stainless steel is cast containing, wt%: no more than 0.018 C, 0.25–0.75 Si, 1.5–2 Mn, 17.80–19.60 Cr, 24.00–25.25 Ni, 3.75–4.85 Mo, 1.26–2.78 Cu, 0.04–0.15 N, rest is Fe and unavoidable impurities. Steel is brought to temperature below 0 °C and exposed to plastic deformation with deformation degree of at least 30 % to form nanotwins with average distance between them less than 1,000 nm and density more than 35 %.EFFECT: steel with high strength is obtained.13 cl, 9 dwg, 5 tbl

Textured electrical steel sheet // 2608914
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, specifically to a sheet of textured electrical steel, used as material of iron core of a transformer and electric equipment. Sheet is made of steel ,chemical composition of which contains C: less than 0.005 wt% and Si: 2–5 wt%, and, optionally, Mn: 0.005–1.0 wt% and one or more elements, selected from Ni: 0.010–1.50 wt%, Cr: 0.01–0.50 wt%, Cu: 0.01–0.50 wt%, P: 0.005–0.50 wt%, Sn: 0.005–0.50 wt%, Sb: 0.005–0.50 wt%, Bi: 0.005–0.50 wt% and Mo: 0.005–0.100 wt%. Sheet has texture, where on distribution diagram of disorientation angle between orientation of crystals of secondary recrystallized texture and Goss orientation there are at least two peaks. Disorientation angle of second peak is 5–10°, and grain size of secondary recrystallized texture is not more than 15 mm.EFFECT: high magnetic properties and low losses in core.3 cl, 5 dwg, 3 tbl, 2 ex
ethod for manufacturing high-strength structural steel and high-strength structural steel product // 2608869
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, specifically to production of high-strength structural steel. Method of producing high-strength structural steel includes a step of making a steel slab, a heating step (1) for heating said steel slab to a temperature in range of 950 to 1,300 °C, a temperature equalising step (2) for equalising temperature of steel slab, a hot rolling step including a hot rolling stage (5) of type I for hot rolling in n-recrystallisation temperature range below recrystallisation stop temperature (RST), but above ferrite formation temperature A3 and to provide a finish rolling temperature (FRT), a quenching step (6) for quenching hot-rolled steel at cooling rate of at least 20 °C/s to a quenching-stop temperature (QT), which quenching-stop temperature (QT) is between Ms and Mf temperatures, a partitioning treatment step (7, 9) for partitioning hot-rolled steel in order to transfer carbon from martensite to austenite, and a cooling step (8) for cooling hot-rolled steel to room temperature by forced or natural cooling.EFFECT: obtained steel is characterised by high strength and impact viscosity.40 cl, 9 dwg, 3 tbl

ethod of desulphurising steel // 2608865
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used during off-furnace treatment of steel to produce steel with carbon content less than 0.05 wt%. Method involves steps of forming slag on molten steel, bringing vacuum above combination of slag and molten steel to a value less than 5 mm Hg, mixing molten steel and slag and deoxidation and desulphurization of molten steel and slag for degassing steel, reducing content of at least sulphur, nitrogen, oxygen and hydrogen and oxygen activity in molten metal to a value less than 30 ppm and formation of slag composition after degassing steel, wt%: CaO 50–70, SiO2 20–28, CaF2 5–15, MgO not more than 8, Al2O3 not more than 1, and a combination of FeO+MnO not more than 2, where total amount of CaO+CaF2+SiO2+MgO is at least 85 % by weight.EFFECT: invention enables to avoid need for aluminium additives, reduces wear of refractory materials and increases efficiency of melting.21 cl, 6 dwg

ethod for thermal treatment of rolled sheet for bending // 2608445
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. In order to increase crack resistance of steel sheet during production of welded pipes, sheet is subjected to heating to temperature of AC3+(30–50) °C and one-sided accelerated cooling to room temperature, followed by bending with deformation on side of accelerated cooled surface, which is used as inner surface of pipe.EFFECT: high crack resistance of steel sheet.1 cl, 2 dwg
ethod of texturized electric steel sheet production // 2608258
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy. Textured sheet from electrical steel, having good magnetic properties, is produced by industrially suitable method using slab material, which contains, in wt% or ppm. at wt, C: 0.08% or less, Si: from 2.0 to 4.5 % and Mn: 0.5 % or less, S: less than 50 ppm., Se: less than 50 ppm., O: less than 50 ppm.,sol. Al: less than 100 ppm., N within range, corresponding to [sol. Al]×(14/27) ppm. ≤ N ≤ 80 ppm., rest is Fe and incidental impurities; in which after cold rolling and before beginning of secondary recrystallization annealing cold-rolled sheet is subjected to nitride treatment to obtain nitrogen content from 50 ppm. by weight or above, up to 1,000 ppm. by weight or less; and total sulphate of and/or sulphide content in annealing separator is from 0.2 wt% to 15 wt%; holding time in temperature range from 300 °C to 800 °C during heat treatment at secondary recrystallization annealing is from 5 hours or more in order to release silicon nitride (Si3N4) and MnS; and using silicon nitride in combination with MnS as normal grains growth inhibitor in order to considerable reduction in magnetic properties change.EFFECT: change of magnetic properties.3 cl, 1 dwg, 3 tbl

Annealed steel types production device and method of said steel types production // 2608257
FIELD: technological processes.SUBSTANCE: invention relates to annealed steel strip production device and methods of its production. Annealed steel strip production device contains heating zone, including heating section, including first heating plant or induction furnace for heating from 400 to 600 °C and second heating plant for steel strip additional heating from 500 °C up to 1,000 °C, holding section to 120 s inclusive, cooling section, including slow cooling zone from annealing temperature to fast cooling beginning temperature, fast cooling zone is intended for from fast cooling beginning temperature to cooling ending temperature, approximately to 300 °C, third cooling zone from second cooling stopping temperature to temperature between ambient air temperature and 100 °C, optional repeated heating zone, optional annealing zone for local thermal treatment of one or more areas of surfaces in annealed strip longitudinal direction to obtain specified properties in longitudinal direction on annealed strip surfaces one or more sections, annealed strip final cooling zone, area of coating application on annealed strip surface, including, at least, section of electrolytic coating application on annealed strip surface, and winding device for annealed strip winding.EFFECT: technical result consists in creation of device, ensuring small-scale products production in form of steel strip from AHSS and UHSS type steels and said steel strip local heat treatment.22 cl, 6 dwg

ethod for obtaining bainitic rail steels // 2608254
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy, specifically to a rail made of low-alloy steel. Rail made from low-alloy steel, wherein steel structure in head contains 5–15 % by volume of ferrite and multiphase bainite, consisting of upper and lower bainite. In method of making a rail from low-alloy steel from a hot-rolled profile rail head in hot-rolled profile directly after coming out of rolling mill stand is subjected to controlled cooling. First step comprises accelerated cooling from temperature 740–850 °C until achieving a first temperature providing ferrite conversion. Second step comprises holding at first temperature. Third step comprises further cooling to a second temperature to allow formation of multiphase bainite. Fourth step comprises holding at second temperature.EFFECT: rail is characterised by high wear resistance, weldability; constant properties are provided throughout length of rail.28 cl, 3 dwg, 2 ex
ethod of texturized electric steel sheet production and primary recrystallized steel sheet for production of texturized electric steel sheet // 2608250
FIELD: agriculture.SUBSTANCE: invention relates to production of texturized electric steel sheet. To improve steel magnetic properties of optionally performed annealing, steel slab hot rolling, containing, in wt% or ppm. at wt: C 0.08 % or less, Si from 2.0 % to 4.5 % and Mn 0.5 % or less, S, Se and O are each limited by less than 50 ppm., sol. Al less than 100 ppm., and N, content of which satisfies condition sol. Al/(26.98/14.00) ppm. ≤ N ≤ 80 ppm., rest is Fe and incidental impurities. Performing hot-rolled sheet annealing and cold rolling, then, performing cold-rolled sheet nitration, with increasing nitrogen content by value from 50 ppm. or more to 1,000 ppm. or less during primary recrystallization annealing or after it, applying annealing separator onto cold-rolled sheet, wherein holding time in temperature range from 300 °C to 800 °C at heating stage during secondary recrystallization annealing is set equal to 5 hours or more to 150 hours or less to provide for silicon nitride (Si3N4) extraction on grains borders and its use as grains normal growth inhibitor.EFFECT: normal growth of grains.5 cl, 2 tbl, 2 ex, 2 dwg
 
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