etallurgy of iron (C21)

C   Chemistry; metallurgy(315514)
C21            etallurgy of iron(23203)

Hot-pressed thick-sheet steel, product moulded by stamping, and method of manufacturing products moulded by stamping // 2628184
FIELD: metallurgy.SUBSTANCE: steel contains, wt %: C: 0.15 to 0.5, Si: 0.2 to 3, Mn: 0.5 to 3, P: 0.05 or less (except 0), S: 0.05 or less (except 0), Al: 0.01 to 1, B: of 0.0002 to 0.01, N: 0.001 to 0.01%, Ti: in the amount equal to or greater than 3.4[N]0.01% and equal to or less than 3.4[N]0.1%, where [N] is the content (wt %) N, the rest are iron and unavoidable impurities. The average diameter of the equivalent circle of Ti-containing inclusions having an equivalent circle diameter of 30 nm or less among the Ti-containing inclusions contained in the steel sheet is 3 nm or more. The amount of Ti in the inclusions and the total amount of Ti in the steel satisfy the ratio: (the amount of Ti in the inclusions (wt %)-3.4[N])≥0.5×[(total amount of Ti (wt %))-3.4[N]], where [N] is the content (wt %) N in the steel. The share of ferrite in the metallographic microstructure is 30% or more.EFFECT: required balance between high strength and elasticity is provided.6 cl, 1 dwg, 16 tbl, 2 ex

Treatment method for moving ferroalloy sheet and continuous production line for its implementation // 2628182
FIELD: metallurgy.SUBSTANCE: method includes a stage of immersing a moving sheet in a molten oxide bath having a viscosity between 0.3⋅10-3 Pa⋅s and 3⋅10-1 Pa⋅s, while the bath surface is in contact with non-oxidizing atmosphere, and the molten oxides are inert to iron. The residence time of the moving sheet in said bath is at least 1 s, and the residue of the oxides, remaining on the sheet surfaces at the outlet of the bath, are removed. A line for treatment of a ferroalloy sheet by this method is also proposed.EFFECT: improvement of adhesion of a metal or metal alloy coating to steel sheets containing a significant amount of readily oxidizable elements.14 cl, 3 dwg

ethod for manufacturing weld bimetallic cutting tool // 2627837
FIELD: metallurgy.SUBSTANCE: after mechanical and thermal treatment of the tool body blank arc welding is performed at a current of 50 to 56 A and an arc voltage of 5 to 6 V, controlling the transfer of electrode metal in the arc by means of pulse wire feed and synchronized pulsed current regime and the formation of a fused layer thickness from 1 to 2 mm. Accelerated cooling is performed after cladding using copper plates attached to the body of the tool blank. Reinforcing mintage of welded metal is performed with surface striker, which impact energy is 6 to 7J. Local release of the welded high-speed cutting steel and the metal of the thermal effect zone (TEZ) at a temperature of 520 to 540°C.EFFECT: method allows to increase the hardness and strength of the metal of the thermal-affected zone, increase wear resistance of bimetallic tool cutting part and reduce energy consumption for its manufacturing.2 dwg, 9 ex
Wear-resistant heavy plates with excellent low-temperature impact strength and method of their production // 2627830
FIELD: metallurgy.SUBSTANCE: steel has a chemical composition containing in wt %: C: 0.10 to less than 0.20, Si: 0.05 to 0.5, Mn: 0.5 to 1.5, Cr: 0.05 to 1.20, Nb: from 0.01 to 0.08, B: 0.0005 to 0.003, Al: 0.01 to 0.08, N: 0.0005 to 0.008, P: not more than 0.05, S: not more than 0.005, O: not more than 0.008, the rest is Fe and unavoidable impurities. Brinell hardness of steel (HBW10/3000) is 361 or more, and the microstructure contains fine precipitate with a diameter of 50 nm or less with a density of 50 or more per 100 mcm2. The microstructure of the steel from the surface to the depth of at least 1/4 of thickness of the plate is a rack martensite with an average grain size of not more than 20 mcm, the average grain size is the average size of crystalline grains surrounded by large-angle grain boundaries having a difference in orientation of 15° or more.EFFECT: steel has high hardness and low-temperature impact strength.17 cl, 2 dwg, 2 tbl
Wear-resistant sheet steel with excellent low-temperature impact strength and resistance to hydrogen attack and method of its manufacture // 2627826
FIELD: metallurgy.SUBSTANCE: steel contains, wt %: C: 0.20 to 0.30, Si: 0.05 to 0.5, Mn: 0.5 to 1.5, Cr: 0.05 to 1.20, Nb: 0.01 to 0.08, B: 0.0005 to 0.003, Al: 0.01 to 0.08, N: 0.0005 to 0.008, P: not more than 0.05, S: not more than 0.005 and O: not more than 0.008, the rest is Fe and unavoidable impurities. Brinell hardness of steel (HBW10/3000) is 401 or more, and the microstructure contains fine precipitate with a diameter of 50 nm or less with a density of 50 or more particles per 100 mcm2. The microstructure of the steel from the surface to the depth of at least 1/4 of the thickness is a rack martensite with an average grain size of not more than 20 mcm, the average grain size is the average size of crystalline grains surrounded by large-angle grain boundaries having a difference in orientation of 15° or more.EFFECT: steel sheets have high low-temperature impact strength and resistance to hydrogen attack.17 cl, 2 tbl

Device and method of dry granuling of slag // 2627825
FIELD: metallurgy.SUBSTANCE: device comprises a rotary spray granulator having a central axis of rotation, a slag jet delivery device, a slag incidence regulator having a comparator for comparing a predetermined drop position of the slag stream with a predetermined slag position and an output device for outputting the output signal to an actuator for moving the rotary spray granulator in accordance with the result of mentioned comparison, the sensors to determine the predicted position of the slag incidence, the actuator for moving the rotary spray granulator according to the result of comparing the position of the slag incidence, the actuator for moving the rotary spray granulator according to the result of comparing the position of the slag incidence. The rotary spray granulator is provided with a part for receiving a slag jet made in the form of a glass, a disk or an annular piece adapted to rotate about the central axis of rotation.EFFECT: invention allows to change the technological chain of granulated slag distribution, as a result of which the slag pour point is located at or near the side wall of the casing, and allows to reduce the dimensions of the casing of the device for granulation.8 cl, 6 dwg

Device and method for controlling charge in electric arc furnaces // 2627821
FIELD: metallurgy.SUBSTANCE: device is provided with, at least, a registration system of the metal charge pointing profile on the conveyor, with, at least, two means for selective storing and loading the metal charge, spaced apart from each other along the said conveyor. The device also comprises a data processing and controlling system connected to the said registration system of the metal charge pointing profile for detecting empty or insufficiently filled conveyor zones. In addition, the said selective storing and loading means are configured to be selectively activated by the said data processing and controlling system to replenish the metal charge located on the said conveyor with an additional charge in accordance with the said empty or insufficiently filled zones.EFFECT: improving the loading quality.13 cl, 5 dwg
ethod of thermomechanical processing microalloy steels // 2627715
FIELD: metallurgy.SUBSTANCE: method includes heating the workpiece at a rate of 0.01 to 50°C/s to temperatures of Ac3±15°C, single deforming with a degree of 40-50%, or double deforming of 20-30% with an inter-information pause of not more than 5 s at the temperature of Ac3±15°C and the deformation rate of 0.1-50 s-1, cooling.EFFECT: producing a homogeneous ultrafine-grained ferrite-pearlite structure with a high complex of mechanical properties with a reduction in processing time and energy consumption.3 ex

Swaged steel, cold-rolled steel sheet and method for the production of swaged steel // 2627313
FIELD: metallurgy.SUBSTANCE: steel contains, wt %: C - 0.030-0.150, Si - 0.010-1.00, Mn - 0.50- less than 1.50, P - 0.001-0.060, S - 0.001-0.010, N - 0.0005-0.0100, Al - 0.010-0.050 and optionally one or several of the following elements: B - 0.0005-0.0020, Mo - 0.01-0.50, Cr - 0.01-0.50, V - 0.001-0.100, Ti - 0.001-0.100, Nb - 0.001-0.050, Ni - 0.01-1.00, Cu - 0.01-1.00, Ca - 0.0005-0.0050, rare-earth metals - 0.0005-0.0050, iron and unavoidable impurities making the rest. The microstructure of the steel contains from 40% to 95% by the share of the ferrite area and from 5% to 60% by the share of martensite, and also, if necessary, one or more of the following phases: 10% or less perlite, 5% or less of residual austenite by volume fraction and less than 40% by the proportion of bainite area. The amount of the share of the ferrite area and the share of martensite is 60% or more.EFFECT: steel has high formability, high chemical conversion treatment properties and coating adhesion.20 cl, 8 dwg, 5 tbl

ethod for controlling metal charge supplied to smelting furnace and relevant loading device // 2627134
FIELD: metallurgy.SUBSTANCE: method for controlling the supply of a metal charge to the smelting furnace includes a step of storing the metal material to be melted in the storage zone. The step of taking metal material out of the storage zone and loading it onto the material supply means to the furnace is carried out by means of the loading means. At the step of supplying material, the material supplying means load the material data into the smelting furnace. The step of storing provides the separation of the storage zone into separate specialized areas. In each of them metal materials of various types are stored. During the steps of taking and supplying, the data processing device controls the actions of the loading means. They carry out the selection of the selected material types from the specialized areas. The materials are loaded onto the means of supplying the material in accordance with the desired method and quantity. The invention also includes a device for controlling the supply of a metal charge to the smelting furnace.EFFECT: invention use prevents local agglomeration or non-optimum distribution of the charge material inside an electric furnace.13 cl, 2 dwg
ethod of manufacture of high-strengthen corrosive-resistant hot-rolled steel with low specific weight // 2627079
FIELD: metallurgy.SUBSTANCE: blank is prepared from steel containing mass. %: Carbon 0.03-0.07, Silicon 0.5-0.8, Manganese 0.4-0.7, Sulfur no more than 0.01, Phosphorus 0.005-0.015, Aluminium 8.0-11.0, Chromium 6.0-10.0, Nickel 0.005-0.03, Molybdenum 1.01-2.0, Titanium 0.01-0.03, Vanadium 0.05-0.07, Niobium not more than 0.06, Nitrogen 0.005-0.05, Iron and unavoidable impurities are the rest, the sum of [Cr+Al] wt % = 14.1-18, the blank is heated in the range from 1100°C to 1300°C, milling is conducted in at least five stages with a reduction ratio in each step from 10% to 25%, the time between two subsequent milling stages not exceeding 9 s, and the milling end temperature of 810-890°C, then the resulting strip is cooled to ambient temperature.EFFECT: increasing the strength and corrosion resistance of the strip while maintaining low specific gravity.2 tbl

Rotary drive of the tuyere and method of injecting a rotating tuyere // 2627074
FIELD: metallurgy.SUBSTANCE: device contains a rotary drive, a transport tube and a swivel connection. The rotary actuator comprises a main support, a hollow shaft, a drive motor and a tuyere mount. The tuyere attachment comprises a support chute, a locking element, at least one locking mechanism for releasably securing the closure element, a pair of laterally spaced angular elements. Each corner element has a support arm through which the pivot axis extends, the lever arm and the receiving slot.EFFECT: improvement of the dispersion of the reagent and reduction of the process time.8 cl, 29 dwg

High-strength multi-phase steel and method for strip manufacture from this steel with minimum tensile strength at 580 mpa // 2627068
FIELD: metallurgy.SUBSTANCE: invention relates to the high-strength multi-phase steel with the minimum tensile strength 580 MPa, preferably with two-phase structure, to manufacture the cold-rolled or hot-rolled steel strip with thickness 0.50-4.00 mm with improved moulding properties, used, in particular, for automotive industry with the lightweight structures use. Steel consists of elements, wt %: C from 0.075 to ≤0.105, Si from 0.600 to ≤0.800, Mn from 1.000 to ≤2.250, Cr from 0.280 to ≤0.480, Al from 0.010 to ≤0.060, P ≤0.020, N ≤0.0100, S ≤0.0150, the rest - iron, due to the impurity melting. With the strips thickness up to 1 mm the content of Mn is preferably ≤1.500%, with the strips thickness from 1 mm up to 2 mm, the content of Mn is preferably ≤1.750%, and with the strips thickness ≥2 mm, the Mn content is preferably ≥1.500%.EFFECT: uniform mechanical and technological strips properties and its suitability for the hot-dip galvanizing.17 cl, 8 dwg, 4 ex
ethod to produce modified addition alloys neodymium-iron for constant magnets neodymium-iron-borium // 2626841
FIELD: metallurgy.SUBSTANCE: modifier in the form of nanodispersed mechanically activated neodymium oxide powder, iron clad, with the particle size 50-100 nm, in the amount of 0.03-0.07 wt % of the stock mass, is introduced into the stock melting in the furnace, provide the holding of the resulted addition alloy melt, after which the melt is poured into the mould, the heating temperature of which is 100-200°C.EFFECT: invention makes it possible to produce the permanent magnets with higher magnetic properties due to producing the addition alloy with the fine crystalline granular structure.1 dwg

ethod and device for protection from corrosion cracking of welded steel structure // 2626705
FIELD: metallurgy.SUBSTANCE: method involves patching the near-surface cracks by step-by-step impact with pulse current in the zone of tensile residual welding stresses and compressing said zone with dynamic impacts. The device contains a movable portal, provided with movable clamps, compressing springs, two electromagnetic clamps, a capacitor point contact welding machine, two electrodes for one-sided capacitor contact welding, a multi-head caulking stiffener with an air cylinder and a bundle of needle wires fixed to the portal casing, with two springs, located at the top and bottom of the portal to dampen its vibration from the side of the reinforcing pneumatic hammer, and a control unit. In this case, each electrode is fixed in the electrode holder with the ability to move by means of the pneumatic cylinder and connected to the capacitor point contact welding machine. The pneumatic thrust and the pneumatic hammer of the multi-head caulking stiffener are made with the possibility of connecting to a source of compressed air.EFFECT: invention protects welded metal from corrosion cracking.2 cl, 1 tbl, 8 ex

ethod of processing metallurgical production waste // 2626371
FIELD: metallurgy.SUBSTANCE: iron and zinc-containing dust, milling scale, carbonaceous reducing agent and slag forming components are mixed, agglomerated, dried and heat-treated in a rotary-hearth kiln. Zinc sublimations are captured, the exhaust gases are cooled. Oxidation and condensation of zinc oxide in the form of dust and trapping of dust containing zinc oxide are carried out. Granulated cast iron and slag are cooled and separated. The ratio of dust and scale is set to provide total iron content in the mixture of at least 50%. The slag forming components are introduced in an amount providing the basicity of CaO/SiO2 in range of 0.6-1.6 and the sulfur content in cast iron is not more than 0.09. The carbonaceous reductant is introduced in an amount providing carbon content in the cast iron ranging from 1.0 to 4.5%. Heat treatment is carried out by two-stage heating: at 1200-1300°C, then at a temperature increased by 80-200°C.EFFECT: increasing the content of zinc oxide in concentrate extracted from dust and scale, obtaining cast iron with metallic iron content of 94 percent or more, reducing the consumption of reducing agent and fuel.3 cl, 1 dwg, 1 tbl, 1 ex
ethod of smelting low-alloy vanadium containing steel // 2626110
FIELD: metallurgy.SUBSTANCE: in the charge, naturally-alloyed vanadium-containing cast iron of batch production is used, and after the melting slag has been loaded, the carbon oxidation is carried out with non-fluxed vanadium-containing pellets serially produced from titanomagnetite raw materials, after which the vanadium is reduced from slags of oxidation periods and "pure" boiling by introducing ferrosilicon in the period of preliminary deoxidation of metal from the calculation of 2-3 kg of silicon per ton of the spent pellets.EFFECT: invention allows to reduce the cost of alloying vanadium steel, to improve the processability of melting and the quality of the metal due to the low sulfur content of vanadium-containing cast iron and vanadium-containing pellets, which practically excludes additional techniques for desulfurizing the metal, while a much lower content of coloured impurities provides additional increasing the quality characteristics of vanadium-containing steels for castings.4 cl, 3 ex

Nickel-base superalloy preweld heat treatment // 2625921
FIELD: metallurgy.SUBSTANCE: preliminaryheat treatment method before welding of Inconel 939 nickel alloy turbine component comprises heating the turbine component to a first temperature in the range from a temperature 35°C (19.4°C) below the phase dissolution temperature γ' and to the onset temperature of the alloy melting and holding at this temperature, cooling at a rate of 1°F (0.56°C) per minute to a temperature of 1,900°F(±25°F) (1,038±15°C) and holding at this temperature, cooling at a rate of 1°F per minute to a temperature 1,800°F(±25°F) (982±15°C) and holding at this temperature. Then, the component is cooled with a velocity 1°F per minute to a temperature from 1,650°F(±25°F) to 1,450°F(±25°F) ((899-788)±15)°C.EFFECT: cracking under deformation aging during welding and subsequent heat treatment.10 cl, 9 dwg, 2 tbl

ethod of low-temperature ion nitriding steel products in magnetic field // 2625864
FIELD: metallurgy.SUBSTANCE: method of low-temperature ion nitriding of steel products in a magnetic field involves performing vacuum heating of a product in a nitrogen plasma of increased density that is created in the toroidal region of oscillating electrons moving along cycloidal closed trajectories formed in the crossed electric and magnetic fields. Before ion nitriding, an ultrafine-grained structure of the product material is formed by intensive plastic deformation by torsion, which ensures the process of diffusion saturation of the surface layer with nitrogen during nitriding.EFFECT: increasing contact durability and wear resistance due to the formation of ultrafine-grained structure of the material.2 dwg, 1 ex
Production of steel sheets of higher wear resistance // 2625861
FIELD: metallurgy.SUBSTANCE: producing the slabs of steel containing, wt %: 0.17-0.28 C, 0.10-0.30 Si, 0.75-1.50 Mn, 0.60-1.20 Cr, 0.60 -1.20 Ni, 0.20 -0.40 Mo, 0.04-0.10 V, 0.02-0.08 Al, 0.001-0.010 N, 0.01 -0.10 Cu, 0.001-0.020 Nb, 0.002-0.040 Ti, 0.001-0.005 B, no more than 0.010 S, no more 0.015 P, the rest is Fe. Slabs are heated in the temperature range 1180-1250°C, the finish temperature of the finishing rolling is set no higher than 960°C, hardening, including rolling heat, is carried out at a temperature of 920-970°C. To relieve internal stresses after tempering with a temperature vacation 150-250°C.EFFECT: providing high hardness and strength while maintaining sufficient ductility and toughness.2 cl, 4 tbl

Blast-furnace smelting method // 2625620
FIELD: metallurgy.SUBSTANCE: blast-furnace smelting method includes the charging material main components loading and the scar removal by the periodic loading of the iron ore charge, having the washing properties. At the same time iron ore charge with washing properties is used, which contains, wt %: non-fluxed pellets - 50-70, agglomerate - 20-45 and mineral part of the converter slag - 5-10. The mentioned iron ore charge loading provide with the shift to the axial furnace area to prevent the furnace lower part refrigerators burnout, and the scar removing process intensification is provided by the increasing of the air blasting amount and its redistributing around the periphery of the furnace by the tuyeres diameter change.EFFECT: invention allows to increase the air blast furnace service life and output by removing the excess deposits on the stack walls and its profile restore.1 dwg, 2 tbl, 1 ex
Casting austenitic high-strength corrosion-resisting in inorganic and organic environments cryogenic steel and method of its production // 2625514
FIELD: metallurgy.SUBSTANCE: obtain the steel melt, pour it into the mould to obtain the casting and cool it. The steel casting has the following composition, wt %: C 0.05-0.07, Cr 18.0-20.0, Ni 5.0-7.0, Mn 9.0-11.0, Mo 1.4-1.8, Si 0.25-0.35, Cu 3.6-4.0, N 0.14-0.22, Al 0.015-0.035, B 0.05-0.1, S ≤0.0025, P≤0.010, Sn≤0.005, Pb≤0.005, Bi≤0.005, As≤0.005, Fe is the rest. The nitrogen content is related to the contents of chromium, copper, nickel and manganese by the following relationships: at the ratio (Cr+5Cu)/(Ni+Mn)≤2.50, the nitrogen content is N = 0.14-0.18%, and at the ratio (Cr+5Cu)/(Ni+Mn)>2.50, the nitrogen content is N = 0.18-0.22%. The casting mechanical processing, its subsequent heating up to the temperature of 1150-1250°C, and the homogenization of at least 2 hours and hardening to the solid solution with the ferrite content in the structure of steel not more than 5%, is carried out.EFFECT: required strength and corrosion properties in the inorganic and organic media in the cryogenic temperatures field.2 cl,1 tbl,1 ex
Structured casting ausaging steel with high strength-weight ratio and method of its processing // 2625512
FIELD: metallurgy.SUBSTANCE: invention relates to the structured ausaging steel, used in various industries, including the manufacture of lightweight units and structures in transport engineering and in construction. Steel contains, wt %: C 1.5-1.8, Mn 18-22, Al 8-12, Mo 0.8-1.2, Si 0.5-0.8, Cr ≤0.1, Ni ≤0.l, Cu ≤0.05, N ≤0.0020, H ≤0.0002, S ≤0.0020, P ≤0.010, Sn, Pb, Bi and As not more than 0.005 each, "РЗМ" 0.005-0.010, Fe - the rest.EFFECT: steel has high strength-weight ratio.4 cl, 1 tbl, 1 ex
ethod of producing high-strength corrosion-resistant hot-rolled steel // 2625510
FIELD: metallurgy.SUBSTANCE: steel billet containing, wt %: carbon 0.03-0.05, silicon 0.5-0.8, manganese 0.4-0.7, sulfur not more than 0.01, phosphorus 0.005-0.015, aluminium 2.1-5.9, chromium 3.0-10.0, nickel 0.01-0.03, molybdenum 1.01-2.0, titanium 0.01-0.03, vanadium 0.05 -0.07, niobium not more than 0.06, nitrogen 0.005-0.05, iron and unavoidable impurities are the rest, with the total content of chromium and aluminium being [Cr+Al] = 5-15 wt %, being heated in the range of 1100°C to 1200°C, and rolling is carried out in several stages with a reduction ratio of 10 to 25% in each step, and rolling is completed at a temperature of 700-800°C and the strip is cooled to ambient temperature, the time between the two subsequent rolling stages not exceeding 9 s.EFFECT: increasing strength and corrosion resistance.2 tbl
Compacted agent for roller melt treating // 2625379
FIELD: metallurgy.SUBSTANCE: compacted agent contains, wt %: calcium carbide 20-30, ash of soda 10-15, fluorspar 15-30, magnesium addition alloy is the rest. The alloy containing 50% silica, 10% calcium, 10% magnesium, the rest is iron is used as the magnesium addition alloy.EFFECT: invention makes it possible to obtain the high-alloyed cast iron with minimal sulfur content in its composition, nonmetallic inclusions, with the homogeneous structure and properties, which guarantees the increase of the performance criteria of the rolls.2 cl, 2 tbl

Hot-molded component of steel sheet and method of its manufacture and steel sheet for hot moulding // 2625374
FIELD: metallurgy.SUBSTANCE: sheet has the following chemical composition, wt %: 0.100 to 0.340 carbon, 0.50 to 2.00 silicon, 1.00 to 3.00 manganese, 0.050 or less phosphorus, 0.0100 or less sulfur, 0.001 to 1.000 soluble aluminium, 0.0100 or less nitrogen, the rest is iron and impurities. The steel structure of the obtained hot-stamped component contains ferrite, at least one of the phases - tempered martensite or tempered bainite, and martensite. The share of the ferrite area is from 5 to 50%, the total share of the tempered martensite and tempered bainite is from 20 to 70%, the share of martensite area is from 25 to 75%, and the total share of the area of the ferrite, tempered martensite, tempered bainite and martensite is 90% or more, and the share of residual austenite is from 0 to 5%.EFFECT: produced hot-stamped component has a high time resistance, high plasticity and flexibility after hot stamping.5 cl, 1 dwg, 4 tbl

Chamber oven for annealing steel sheet rolls // 2625371
FIELD: metallurgy.SUBSTANCE: chamber oven contains a support base for the roll, on which the end surface of the roll is mounted. The support base supports the roll in an upright position. The inner cap covers the entire roll casing. The cooling pipe extends downward from the top of the inner cap to the interior of the inner peripheral portion of the roll and cools the roll from the inner surface side as the coolant passes through the interior of the cooling pipe.EFFECT: high performance.3 cl, 21 dwg, 1 tbl

Steel sheet for hot forming and method of manufacturing hot-stamped steel elements // 2625369
FIELD: metallurgy.SUBSTANCE: steel sheet includes, in wt %, C: 0.15 to 0.35, Si: 1.0 to 3.0, Mn: 1.0 to 3.0, Al: more than 0 up to 0.10, Ti: from ([N]×48/14) to 0.10, where [N] is the amount of N in the steel sheet, B: from 5 million-1 up to 50 million-1, P: more than 0 up to less than 0.015, S: more than 0 up to 0.010 and N: more than 0 up to 0.010, the residue is iron and related impurities. The average oxygen concentration from the outer surface of the steel sheet to a depth of 10 mcm in the thickness direction of the sheet is 0.70 wt % or more.EFFECT: improved quality of hot stamping due to stable and reliable suppression of scale shedding, peeling during stamping.5 cl, 6 wg, 3 tbl, 2 ex

High impact steel sheet with high stability to delayed failure and low-temperature shock viscosity, and high impact part, manufactured with its use // 2625366
FIELD: metallurgy.SUBSTANCE: sheet is made of steel, containing wt %: C from 0.20 to 0.42, Si from 0.06 to 0.5, Mn from 0.2 to 2.2, Cr from 0.1 to 2.5, B from 0.0005 to 0.01, O from 0.0020 to 0.020, Al from 0.001 to 0.03, Ti from 0.001 to 0.05, N 0.1 or less, P 0.03 or less, S 0.02 or less, the rest is Fe and unavoidable impurities. In steel there are from 5×103 particles per mm2 up to 1×105 particles per mm2 of manganese oxides (Mn), having the maximum length from 1 mcm up to 5 mcm and there are from 1.7×102 particles per mm2 upto 5×103 particles per mm2 of complex Mn-Si oxides, having the short axis length 1 mcm or more and the length in the longitudinal direction of 10 mcm or less.EFFECT: steel has the high stability to delayed fracture and low-temperature shock viscosity.7 cl, 5 dwg, 16 tbl, 8 ex
Production method of the reduced iron agglomerate // 2625362
FIELD: metallurgy.SUBSTANCE: agglomerate, containing the material with iron oxide, the carbon reducing agent, the melting point controller, the material accelerating the melting temperature controller and the binder, are introduced into the under reheating furnace with the moving bottom. The agglomerate is heated to reduce the iron oxide in the agglomerate and the resulting product is melted by additional heating to coalescence iron component. In this case, the agglomerate containing the melting temperature controller is used, which has the average particle size 0.3 mm or less, and in which the content of particles with the diameter 0.5 mm or less is 55% by weight or more. The melting temperature controller is, in particular, dolomite or limestone, and fluorite is the material that accelerates the action of the melting temperature controller.EFFECT: invention allows to improve the yield of reduced iron agglomerate, having the large particle diameter and to reduce its production time.7 cl, 8 tbl, 2 ex
ethod of manufacturing ribbons from difficult-to-form alloy based on chrome // 2625361
FIELD: metallurgy.SUBSTANCE: ingot is obtained from an alloy containing, wt %: Ni 31-35, Ti 0.05-0.3, V 0.1-0.4; W 1-3, impurities - not more than: O 0.08, N 0.04, Si 0.1, Al 0.06, Fe 0.5, Σ(Al+Si) - 0.2, Cr - the rest, the ingot is subjected to homogenizing annealing by heating to a temperature of 1100-1200°C in a vacuum oven at a pressure of 0.1-1.0 Pa, holding and cooling to the shop temperature. The resulting billet is subjected to single or multiple operations in the following sequence: mechanical treatment, placing it in a capsule, degassing the capsule by vacuum treatment, sealing the capsule, heating the capsule with the billet in a furnace with a protective atmosphere to a temperature of 1150-1250°C, pressing the capsule with a billet with an extractive coefficient of 1.7-9.5 and a degree of deformation of 40-90% to obtain a rod of the given size. The capsule is made of structural steel, the yield point of which is 1.5-2 times less than the yield strength of the alloy.EFFECT: improving the quality of the rod, reducing the surface roughness and grinding the structure.1 tbl

Hot straight thick-gauge plate formed by pumping the product and method of manufacturing formed by stamping the product // 2625357
FIELD: metallurgy.SUBSTANCE: invention relates to the field of metallurgy, namely hot-stamped plate steel, suitable for producing a stamped article. Steel contains wt %: C: 0.15 to 0.5, Si: 0.2 to 3, Mn: 0.5 to 3, P: 0.05 or less (except 0), S: 0.05 or less (except 0), Al: 0.01 to 1, B: of 0.0002 to 0.01, N: 0.001 to 0.01, Ti: in the amount equal to or greater than 3.4[N]+0.01 and equal to or less than 3.4[N]+0.1, where [N] is the content (wt %) N, the rest are iron and unavoidable impurities. The average diameter of the equivalent circle of Ti-containing inclusions having an equivalent circle diameter of 30 nm or less among the Ti-containing inclusions contained in the steel sheet is 6 nm or more. The amount of Ti in the inclusions and the total amount of Ti in the steel satisfy the ratio: (the amount of Ti in the inclusions (wt %)-3.4[N]) < 0.5[×(Total amount of Ti (wt %)) - 3.4[N]], where [N] is the content (wt %) N in the steel. The share of ferrite in the metallographic microstructure is 30% or more.EFFECT: products have excellent characteristics of softening resistance in the heat affected zone and the required ratio between high strength and elasticity.6 cl, 1 dwg, 16 tbl, 2 ex

ethod and device for metallurgical slag processing // 2625352
FIELD: metallurgy.SUBSTANCE: method includes a slag flow direction (12) from melting chamber (13) into storage reservoir (17) disposed below at least 5 m vertically from bark aperture (15), wherein in the slag stream is supplied with inertization additives (22) from reservoir (21) by means of tubular rod sprayer (18) associated with means of pneumatic supply (20) and reservoir (21), wherein additives (22) are supplied using a spray gun (18) through its outlet end, which is positioned providing impingement of additives flow (22) and slag flow in vertical elevation of the slag flow discharge point from melting furnace (11) less than or equal 3 m, and providing for additives (22) and a slag flow a space of at least 2 m and time for aggregation and stirring in a dynamic manner during their fall to downstream reservoir (17), and additives (22) by means of a supply (20) at the outlet of sprayer (18) are supplied at a speed of 3 m/s to 50 m/s and a pressure of 0.3 bar (30 kPa) to 6 bar (600 kPa).EFFECT: increased product uniformity and homogeneity, regardless of the slag type and the conditions of its processing.15 cl, 7 dwg

ethod of production of grain-oriented sheet from electrical steel // 2625350
FIELD: metallurgy.SUBSTANCE: method of production of a grain-oriented sheet of electrical steel includes heating a slab containing, wt %: C from 0.0005 to 0.005, Si from 2.0 to 4.5, Mn from 0.005 to 0.3, S and/or Se (in total) of 0.05 or less, dissolved Al from 0.010 to 0.04, N 0.005 or less, the rest is Fe and unavoidable impurities, slab hot rolling to produce a hot-rolled sheet, if required, hot-rolled sheet annealing in the hot zone, cold rolling of the hot-rolled sheet in one, two or more passes with intermediate annealing between them to obtain a cold-rolled sheet of a final thickness, cold-rolled sheet annealing to primary recrystallization, and annealing to secondary recrystallization. The IC index of steel sheet aging prior to final cold rolling is set to 70 MPa or less for efficient growth of Goss-oriented grains.EFFECT: obtaining a grain-oriented sheet of electrical steel with good magnetic properties, without limiting the content of C in a relatively large amount.13 cl, 5 dwg, 5 tbl, 4 ex

ethod for hardening helical cylindrical springs // 2625196
FIELD: machine engineering.SUBSTANCE: method involves winding the spring with a pitch exceeding the pitch of the finished spring, heat treatment, wheel blasting, lumo control, grinding of the ends of the heat-treated spring, compression of the spring until the coils touch. In the final stage, cold work hardening of the outer and inner surfaces of the compressed spring is carried out by blanking and cold work hardening of the compressed spring surface is carried out along the contact line of the coils by means of a hardening device when a compressed spring is located in a die hole. The cold work hardening of the outer and inner surfaces of the compressed spring is carried out by expanding the coils of the spring to the surface of the die hole with the punch entering it, wherein the diameter of the die hole is equal to the diameter of the compressed spring. The gap between the die hole and the punch surface is chosen less than the diameter of the coil spring by 0.2…5 mm. The cold work hardening of the compressed spring surface along the contact line of the coils is carried out by compressing the springs with a force of 5…300F3, where F3 is the spring force at maximum deformation.EFFECT: increased productivity of hardening and the stability of the elastic properties of the spring.3 cl, 3 dwg

elting process starting method // 2624572
FIELD: metallurgy.SUBSTANCE: melting device contains the melting vessel, containing the main chamber, that contains the bath of slag and molten metal with the frozen slag layer. At that the method includes the following steps: (a) inserting of the external ignition source into the main chamber of the melting vessel to form the heating zone in the main chamber, (b) start of supply the cold oxygen containing gas into the main chamber and igniting of the combustible material in the main chamber, (c) start of supply the carbonaceous material into the main chamber and temperature increasing in the main chamber, and melting of the frozen slag layer in the main chamber, and (d) start of supply the metal containing material into the main chamber and melting the metal containing material and producing the molten metal in the main chamber.EFFECT: recognition of the necessity to create the essentially large and stable heating zone for ignition of oxygen and coal in the melting vessel main chamber by means of the independent facilities.21 cl, 2 dwg
Processing method of titanium alloys drill pipes threaded joint // 2624274
FIELD: metallurgy.SUBSTANCE: processing method includes the laser irradiation of the threaded part of the drill pipes, then provide the wear-in of the threaded pipe sections through its circular screwing together - unscrewing. The tightening torque at screwing is set within 90-110% from the pipes maximum operational load, and the number of cycles is set within 5-10.EFFECT: using of the invention helps to reduce the friction and adhesion properties of the drill tools threaded joints.1 cl
ethod of flux bed building in furnace // 2624245
FIELD: metallurgy.SUBSTANCE: invention refers to metallurgy and other industry sectors where furnaces with liquid flux bed are used. Namely, invention refers to a method of flux bed building in furnaces for Vanukov melting process, Romelt process, waste processing in molten slag, coal gasification in bubbled molten slag. For flux bed building in furnace by fuel combustion flare in work space of the furnace between enclosure structures and bottom, part of solid materials forming slag is fed and molten at the inner surface of furnace enclosure structures above melt level in the flux bed. Temperature at the inner surface of enclosing structures exceeds softening temperature of materials forming slag, containing particles with the size under 1 mm, by 20-100 °C.EFFECT: reduced time of furnace launch and fuel consumption.6 ex

Device for pressure-heated treatment of low-hardness shafts // 2623972
FIELD: machine engineering.SUBSTANCE: device contains a staple and a threaded locking mechanism for the workpiece, which is connected to the staple, in the form of two support caps with holes, in which cylindrical rods with thread are installed. The staple is made in the form of a cylindrical pipe with flanges at the ends on which the support caps are placed. The lower cover is fixed firmly. The upper support cover is made of two cams - fixed and movable. The lower support cover consists of two semi-cylindrical supports, which are tightened into the cylinder by a clamp.EFFECT: improving the quality of processing.5 dwg
Heavy plate manufacturing method // 2623945
FIELD: metallurgy.SUBSTANCE: steel making, continuous casting, slab heating, roughing and finishing rolling, accelerated cooling are performed. Slab heating prior to rolling is carried out at a temperature of 1190-1230°C for 5-10 hours, roughing is completed at a rolling temperature of at least 940°C and the thickness of the transfer bar is 38-45% of the slab thickness, finishing begins at a temperature of 920-980°C and finish at a temperature of at least 910ºC and the rolled product thickness of 19-25% of the slab thickness. Then the accelerated cooling of the rolled product is carried out at a rate of 55-110°C/min down to a temperature of 20-50°C, then the rolled product is heated up to a temperature of 610-660°C, at which it is held for at least 5 hours, and after that cooled in air at a rate of no more than 1.5°C/min to get a structure consisting of bainite and residual martensite, the proportion of which does not exceed 5%.EFFECT: provision in a rolled product of a thickness of more than 60 mm of a yield strength of at least 900 MPa, tensile strength of not less than 970 MPa, relative elongation of not less than 15 percent, increased cold resistance of KCV and good weldability.7 cl

Oxygen converter for processing iron and metal scrap with increased content of harmful impurities // 2623934
FIELD: metallurgy.SUBSTANCE: oxygen converter for processing a batch with increased content of harmful impurities contains a cylindrical metal body lined by the inner refractory and belted from the outside with two bandages and a gear ring with a spherical bottom and a truncated cone neck that can be rotated in a vertical plane on two support pins and rotated on the centering rollers with respect to the longitudinal axis of symmetry with the help of individual drives located on the working platform. The converter is equipped with a powdered lime feed system in a jet of oxygen through a water-cooled tuyere containing mechanisms for moving and tilting the tuyere, as well as a metering device. In addition, it is additionally equipped with a gas-dynamic cut-off system for the final process slag during the discharge of the melt through the neck into a ladle containing two rigidly interconnected rockers fixed to the horizontal shaft mounted in bearing supports perpendicular to the vertical plane, in which the longitudinal axis of symmetry and the converter body lie. Moreover, the rockers are provided with C-shaped guide rails with rollers mounted therein, rotatably mounted on the end portions of the cylindrical gas distribution chamber having slotted holes and rigidly connected to one end of the gas supply pipe, the other end of which is fixed in a hinge support. At the rear ends of the rockers there are counter-loads, and on the front axles, the levers that are engaged, when turning the converter body with the supports fixedly mounted on its support ring, are fixed by means of the axles.EFFECT: improving the quality of the melted steel and decreasing the wear rate of the ladle lining.7 dwg
ethod of thermal processing of products with metallic coating // 2623929
FIELD: machine engineering.SUBSTANCE: pre-hardening, tempering and coating the product with a vacuum spraying method, cryogenic treatment of the product in a nitrogen gas environment at a temperature of -153 to -196°C for more than 24 hours followed with heating in it to room temperature are carried out, then a low temper is carried out at a temperature of 150 to 180°C followed by air cooling.EFFECT: increase of products wear resistance and increase of operational durability.2 cl, 2 tbl

ethod to strengthen cylindrical helical springs // 2623847
FIELD: machine engineering.SUBSTANCE: method involves winding the spring with a pitch which exceeds the pitch of the finished spring, lumocontrol, grinding the ends of the heat-treated spring, shot blasting and predeformation. In the final stage, after predeformation, the outer and inner surfaces of the spring are hardened in one operation by pressing using a hardening device when the spring is in the die hole by swelling the spring coils to the surface of the die hole by the punch entering it. The gap between the die hole and the punch surface is chosen to be less than the diameter of the spring coil by 0.2…5 mm.EFFECT: increased stability of the spring elastic properties.1 dwg
ethod of heat treatment of cold rolled products made of low-carbon steel // 2623572
FIELD: metallurgy.SUBSTANCE: simple heating is carried out in a protective atmosphere from a temperature of 200-220°C to the annealing temperature Tann=550+3100°C, where 550 and 3100 are empirical factors obtained experimentally, C is the fraction of carbon in steel, wt %, holding time in the furnace of t=0.18×m+10, where 0.18 and 10 are empirical factors obtained experimentally, m is the average mass of a roll in the load, t, heating stop, heating hood removal, holding under the cooling hood for 15-30 minutes, after which accelerated cooling under the muffle at a rate of 20-30°C/h for 14-22 hours. In addition, accelerated cooling under the muffle is carried out from a temperature of not more than 530°C, and unpacking is performed at a temperature of not more than 90°C.EFFECT: increase in the performance of hood furnaces and a reduction in the consumption of energy resources while guaranteeing the required complex of mechanical properties of cold-rolled strip, a significant reduction in the sorting for the welding sticker patches.3 cl, 1 tbl

Plate steel for main pipe and main pipe // 2623569
FIELD: metallurgy.SUBSTANCE: invention relates to plate steel of thickness of 25 mm or more for making the main pipe. Steel contains wt %: C 0.040-0.080, Si 0.05-0.40, Mn 1.60-2.00, P 0.020 or less, S 0.0025 or less, Mo 0.05-0.20, Ca 0.0011- 0.0050, Al 0.060 or less, Nb 0.010-0.030, Ti 0.008-0.020, N 0.0015-0.0060, O 0.0040 or less, the rest is Fe and unavoidable impurities. Ratio of Ca content to S content [Ca/S] is from 0.90 to 2.70, and ratio of Ti content to N content [Ti/N] is from 2.20 to 5.00. Value of carbon equivalent Ceq is from 0.380 to 0.480. In the position of 1/4 of sheet thickness, ferrite fraction (F1) is 20 to 60%, the rest is bainite, wherein ferrite average grain diameter is 2.0 to 15.0 mcm. In the position of 1/2 of sheet thickness, ferrite fraction (F2) is 5 to 60%, the rest is bainite or bainite and martensite, wherein ferrite average grain diameter is 5.0 to 20.0 mcm. Ratio (F1/F2) is from 1.00 to 5.00. Hardness in the position of 1/2 of sheet thickness is 400 Hv or less, and the length of MnS in the position of 1/2 of sheet thickness is 1.00 mm or less.EFFECT: steel has high resistance to hydrogen cracking, strength and toughness.4 cl, 1 dwg, 4 tbl

High strength sheet steel having low ratio of yield strength to tensile strength, excellent as of resistance to post-deformation aging, method of its production and high strength welded steel pipe made thereof // 2623562
FIELD: metallurgy.SUBSTANCE: steel has a chemical composition containing in wt %: C: 0.03-0.08, Si: 0.01-1.0, Mn: 1.2-3.0, P: 0.015 or less, S: 0.005 or less, Al: 0.08 or less, Nb: 0.005-0.07, Ti: 0.005-0.025, N: 0.010 or less, O: 0.005 or less, Fe and unavoidable impurities are the rest. The steel has a metallographic structure including the bainite phase, island martensite and polygonal ferrite phase in the surface areas within 5 mm from the top and the bottom surfaces. The share of the island martensite area is 3-15%, and the equivalent diameter of the island martensite circle is 3.0 mcm or less. The share of the polygonal ferrite phase area in the surface areas is 10-80%. Steel has a change in Vickers hardness in the thickness direction of ΔHV30 or less, a change in Vickers hardness in the width direction of ΔHV30 or less, maximum in Vickers hardness in the steel sheet surface areas of HV230 or less, yield strength to strength limit ratio 85% or less, and elongation 22% or more with a full thickness tensile test.EFFECT: steel has high strength and resistance to post-deformation aging.4 cl, 1 dwg, 4 tbl, 1 ex

High strength sheet steel having low ratio of yield strength to tensile strength, excellent as of resistance to post-deformation aging, method of its production and high strength welded steel pipe made thereof // 2623551
FIELD: metallurgy.SUBSTANCE: steel has chemical composition comprising, in wt %: C 0.03-0.08, Si 0.01-1.0, Mn 1.2-3.0, P 0.015 or less, S 0.005 or less, Al 0.08 or less, Nb 0.005-0.07, Ti 0.005-0.025, N 0.010 or less, O 0.005 or less, Fe and unavoidable impurities - the rest. The steel has a metallographic two-phase structure consisting of a phase of bainite and island martensite. The portion of the island martensite phase area is 3-15%, and the size of the island martensite grains in the form of an equivalent circle diameter is 3.0 mcm or less. Steel has a change in Vickers hardness in the thickness direction of ΔHV30 or less, a change in Vickers hardness in the width direction of ΔHV30 or less, maximum in Vickers hardness in the steel sheet surface areas of HV230 or less, yield strength to strength limit ratio 85% or less, and elongation 22% or more with a full thickness tensile test.EFFECT: steel has high strength and resistance to post-deformation aging.4 cl, 1 dwg, 4 tbl, 1 ex

ethod of band workpiece heating and device for its implementation // 2623525
FIELD: metallurgy.SUBSTANCE: method of band workpiece heating includes the winding of the band workpiece into the reel block, heating of the band workpiece on the reel block in the furnace up to the predetermined rolling temperature Tpr=870÷950°C, holding of the band workpiece on the reel block in the furnace for the temperature equalization along its entire length and winding of the heated band workpiece from the reel block for the rolling. The band workpiece is wound layer-by-layer with tension on the reel block in the furnace, preheated up to the temperature Trb, exceeding Tpr 100÷150°C, the working cylindrical surface of the reel block, while changing the layer-by-layer winding speed Vwin of the band workpiece on the reel block, which is found according to the proposed formula.EFFECT: increase of the speed and uniformity of the band workpiece heating, while reducing the total energy costs for its heating and rolling.6 cl, 6 dwg, 1 ex

Device and method of metal band continuous processing // 2623520
FIELD: metallurgy.SUBSTANCE: device for continuously processing of the metal band (1), in particular the metal band made of aluminium, or the aluminium alloy, or the non-ferrous metal or the non-ferrous metal alloy, contains the temperature maintaining device (2) through which passes the suspended metal band (1) and the adjustment device (7) of the band middle position, by means of which it is possible to control or adjust the metal band (1) middle position in the band moving plane and across the band moving. The temperature maintaining device (2) has at least one heating section (3) from the input side, and the cooling section (4) from the output side. The band position adjustment device (7) according to the invention is located inside the cooling section (4).EFFECT: provision of the band stable movement in the heating device and the exclusion of its damage.15 cl, 3 dwg

Cast-iron melt processing method by nanosecond electromagnetic impulses (nemi) // 2623390
FIELD: metallurgy.SUBSTANCE: in the method the melt is heated up to the temperature of 1500°C, it is hold at this temperature for 5 min, and then the melt is cooled up to the temperature of 1350°C, at which the electromagnetic processing of the melt is performed by nanosecond electromagnetic impulses. After heating up to 1500°C add 8 wt % of the chromium in the form of ferrochromium grade FX025 into the melt, then after cooling and electromagnetic processing for 15…20 minutes introduce the silicon containing magnesium modifier, FSMg7 in the amount of 0.25 wt % with further cooling of the melt up to the solid state.EFFECT: invention allows to increase the cast iron abrasion resistance and heat resistance.2 tbl, 2 ex
 
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