119results about How to "Uniform tissue performance" patented technology

The invention discloses a low-compression ratio hot-rolled 9Ni steel thick plate and a manufacturing method thereof. The low-compression ratio hot-rolled 9Ni steel thick plate comprises, by mass, 0.035-0.075% of C, 0.15-0.25% of Si, 0.50-0.80% of Mn, less than or equal to 0.006% of S, less than or equal to 0.008% of P, 8.9-9.5% of Ni, 0.020-0.045% of Al and the balance Fe and impurities. The manufacturing method comprises the following steps of converter smelting, LF and RH refining, continuous casting of a thick plate blank having the thickness of 150mm, two-stage rolling, rolled workpiece laminar cooling, and heat treatment adopting an out-line quenching and tempering technology. The low-compression ratio hot-rolled 9Ni steel thick plate has simple alloy components and a low cost. Based on a low-compression ratio, the steel thick plate having the thickness above 35mm is rolled and has a good plate shape. After heat treatment, transverse impact energy at a temperature of -196 DEG C is greater than or equal to 160J. The low-compression ratio hot-rolled 9Ni steel thick plate has a good strength-toughness matching degree.

The invention relates the method for producing seamless axle steel pipe. The method uses seamless steel pipe billet, and the billet adopts low-alloy high-strength steel, which comprises C 0.14-0.18%, Si 0.3-0.55%, Mn 1.4-1.8%, V 0.02-0.08%, Nb 0.02-0.08%, Ti 0.02-0.08%, and Al 0.015-0.03%. The method comprises the following steps: 1 normalization heat trematment; 2 acid cleaning and lubricating; 3 fluid pressure shaped cold-drawing, thickening four corners of the steel pipe, the rate of the wall thickness and the corner thickness being 1:1.15-1.2; 4 heat treating product. The hardening temperature is 880-950Deg.C, keeping temperature is 20-30min, the cooling temperature is 350-450Deg.C, drawing temperature is 500-600Deg.C, and keeping temperature is 40-60min. The invention has homogeneous integral structure property and strong combination mechanics property.

The invention discloses a production method of a graphene-aluminum composite, and belongs to the field of metal-matrix composites. Aluminum alloy powder with the semisolid temperature interval and graphene are adopted as raw materials. The method mainly includes the steps of 1, chemical nickel plating of the graphene; 2, mixing; 3, pressing; and 4, semisolid extruding. According to the graphene-aluminum composite produced through the method, the wettability and the metallurgical bonding strength of the nickel-plated graphene and aluminum alloy are high, the nickel-plated graphene is uniformly distributed in the matrix aluminum alloy, the microstructure is compact, the specific strength and the specific stiffness are high, and the thermal conductivity and the electrical conductivity are good. Thus, the graphene-aluminum composite has wide application prospects in the fields of the national defense and military industry, aerospace, electricity and heat exchange.

The invention relates to a large-thickness lamellar tearing-resistant modulated high-strength steel plate with 960 MPa-level yield strength and a production method thereof. The chemical components ofthe large-thickness lamellar tearing-resistant modulated high-strength steel plate with 960 MPa-level yield strength comprises, by weight, 0.15-0.20% of carbon, 0.10-0.40% of silicon, 0.90-1.30% of manganese, 0.010-0.040% of niobium, 0.010-0.045% of vanadium, smaller than or equal to 0.010% of titanium, 0.03-0.06% of aluminum, 0.50-1.00% of nickel, smaller than or equal to 0.1% of copper, 0.30-0.80% of chromium, 0.20-0.70% of molybdenum, 0.001-0.005% of boron, 0.001-0.005% of calcium, smaller than or equal to 0.010% of phosphorus, smaller than or equal to 0.002% of sulphur, smaller than or equal to 0.002% of oxygen, smaller than or equal to 0.004% of nitrogen, smaller than or equal to 0.00015% of hydrogen and the balance iron and inevitable impurity elements. The technological steps of thesteel plate comprises smelting, secondary refining, vacuum degassing, calcium treatment, continuous casting, heating, rolling, steel plate slow cooling, quenching and tempering. The large-thickness lamellar tearing-resistant modulated high-strength steel plate with 960 MPa-level yield strength has high comprehensive mechanical property; the yield strength is greater than or equal to 960 MPa; thetensile strength is greater than or equal to 1000 MPa; the Charpy impact power at a low temperature of minus 40 DEG C is greater than or equal to 30J; the Z-direction tensile fracture surface shrinking rate is greater than or equal to 35%; and the lamellar tearing-resistant property is good.

The invention discloses a method for producing a 65Mn hot rolled steel plate, which comprises the steps of smelting, refining, thin slab casting, soaking, high pressure water descaling, hot continuous rolling, cooling and reeling based on the process of thin slab casting and rolling. The molten steel superheat temperature is T superheat (30 DEG C <T superheat < / = 45 DEG C), the charging temperature of casting blanks is T charging (900 DEG C < / = T charging < / = 1050 DEG C), the final rolling temperature is T final (850 DEG C < / = T final < / = 950 DEG C), the reeling temperature is T reeling ( 550 DEG C < / = T reeling < / = 650 DEG C), the liquid core pressure of casting blanks is L pressure (2 < / = L pressure < / = 20mm), and the depth of a single-surface decarburized layer is 0.3 to 0.9 percent of the depth of the steel plate. The chemical constitutes of molten steel after being alloyed in a refining process comprise 0.62-0.70 wt.% of C, 0.17-0.37 wt.% of Si, 0.90-1.20 wt.% of Mn, less than or equal to 0.035 wt.% of P, less than or equal to 0.035 wt.% of S, less than or equal to 0.25 wt.% of Cr, less than or equal to 0.25 wt.% of Ni and the balance of Fe and inevitable impurities. The 65Mn hot rolled steel plate produced in the method has the characteristics of uniform structure property, high thermal stability and high strength, and the quality of the 65Mn hot-rolled steel plate is obviously improved.

The invention relates to super-thick EH36 steel for an offshore wind power pipe pile. The super-thick EH36 steel for the offshore wind power pipe pile comprises the following chemical components in percentage by mass: .015 to 0.18 percent of C, 0.15 to 0.30 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.0070 percent of P, less than or equal to 0.0030 percent of S, 0.050 to 0.070 percent of Nb, 0.015 to 0.030 percent of V, 0.08 to 0.020 percent of Ti, 0.030 to 0.050 percent of Al, 0.15 to 0.40 percent of Ni, 0.10 to 0.20 percent of Cr, and the balance of Fe. A production process flow comprises the following steps: performing converter operation, performing LF refining, performing vacuum degasifying, performing Ca treatment, performing continuous casting, dehydrogenizing, rolling, performing air cooling, performing high-temperature hot straightening, and normalizing. According to the production process flow, the super-thick EH36 steel of 90 to 120 mm for the offshore wind power pipe pile, which is high in unit weight, high in strength, high in impact toughness, small in thickness tolerance and high in straightness and does not have a surface defect is obtained.

The invention discloses a preparing method of a TiAl alloy turbine blade. The method comprises the steps that a three-dimensional model of the turbine blade is built, slicing treatment is carried out,and layer cutting data are obtained; secondly, secondly, a forming cavity of an electronic beam area selection rapid forming device is subject to vacuum pumping, and a forming substrate is preheated;thirdly, TiAl alloy powder is laid on the preheated forming substrate, and preheating is carried out; fourthly, the preheated TiAl alloy powder is subject to area selection melting scanning, and a single-layer solid piece layer is formed; fifthly, the third step and the fourth step are repeated, and an electronic beam area selection melting forming part is formed; sixthly, after cooling, the TiAlalloy turbine blade is obtained. The TiAl alloy turbine blade is prepared through the electronic beam area selecting rapid forming method, preheating of the forming substrate and the TiAl alloy powder is achieved, forming temperature of the TiAl alloy turbine blade is controlled, internal heat stress of the TiAl alloy turbine blade is reduced, deforming and breaking of the TiAl alloy turbine blade are avoided, and matching of strength and plasticity of the TiAl alloy turbine blade is enhanced.

The invention provides a 2400-MPa-strength prestressed steel strand and a production process thereof. The 2400-MPa-strength prestressed steel strand comprises the following chemical components in percentage by mass: 0.88-1.02% of C, 0.10-1.30% of Si, 0.30-0.90% of Mn, 0.10-0.50% of Cr, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.01-0.08% of Al, 0.01-0.10% of V, and thebalance Fe and inevitable impurities. Through processes such as slat bath, the problems that a bad structure and large difference in property of a whole wire rod due to the fact that the cooling rateof the air-blown wire rod is low and uneven are solved, rapid cooling and isothermal phase change of the wire rod are achieved, and the strength and uniformity of the structure property are greatly improved; segregation is at a low level, the structure property is more uniform, no quenching structures influencing use, such as a network carbide and a martensite, exists, and good plasticity is stillmaintained while high strength is ensured; and after the wire rods is subjected to drawing, pulling, stranding, and stabilizing treatment, the strength of the strand reaches 2300 MPa or above and 2400 MPa or above, and can be used for producing the superstrength prestressed steel strands of 2300 MPa and 2400 MPa.

The invention provides a process for producing an aluminum alloy conductor, comprising the following steps: proportioning materials, melting, refining, carrying out horizontal continuous casting, cleaning, extruding continuously, quenching on line, carrying out small cold deformation stretching on line and ageing manually. By carrying out small cold deformation stretching on line and ageing manually according to the characteristics of continuous extrusion and large shearing deformation, the conduction with small textures, uniform properties and excellent surface quality is obtained. The process has the advantages of simple steps, convenience of operation, high yield and low production cost. The product produced by adopting the process has uniform properties and excellent surface quality. The process provided by the invention is used for producing the aluminum alloy conductor.

The invention provides a prestressed steel strand with the strength of 2100 MPa and a production process. The prestressed steel strand comprises the following chemical components of, in percentage bymass, 0.84%-0.90% of C, 0.10%-1.00% of Si, 0.30%-0.90% of Mn, 0.10%-0.50% of Cr, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.01%-0.08% of Al, 0.01%-0.10% of V, and the balance Fe and inevitable impurities. Through special component design, a wire rod obtained through the production method is segregated into quenched structures such as network carbide and martensite which are low in level, uniform in structure and free of influences on use, good plasticity is still kept while high strength is guaranteed, and the production cost is reduced by one heating, after the obtained wire rods with the specifications of 13 mm and 14 mm are subjected to drawing, stranding and stabilizing treatment, the strength of the stranded wire can reach 2000 MPa-2100 MPa and 2100 MPa-2200 MPa respectively, and the stranded wires can be used for producing high-strength prestressed steel strands with the grades of 2000 MPa and 2100 MPa respectively.

The invention relates to a forging forming method for magnesium alloy rings. The method includes the steps of blanking, homogenization treatment of blanks, pretreatment of the blanks and a die before forging, multidirectional free forging performing, die forging and finish forging forming and the like. In order to solve the problems of magnesium alloy ring part forming process complexity, easiness in cracking of forging forming and the like, forged magnesium alloy rings are successfully produced by combining multidirectional free forging performing with die forging and finish forging forming, by means of reasonably selecting technological parameters of forging temperature, press-down rate, deformation and the like, and by mutual linking and matching of processes. Auxiliary processes such as extrusion breakdown and the like are omitted, forming processing of the forged rings can be completed only on one hydraulic press, production efficiency is high, the rings are good in size precision and stability, the produced rings are full in mold filling, free of defects such as cracks, folds and the like, and compact in internal texture.

The invention discloses a manufacturing method of a stainless steel square pipe. A forged round ingot is adopted as a pipe billet and subjected to hot extrusion, cold deformation, heat treatment and surface treatment to form a finished product. The method comprises the specific steps that 1, a semi-finished round pipe corresponding to the finished product in size is prepared from the stainless steel pipe billet through the seamless forming technology comprising hot extrusion and cold rolling / cold drawing; 2, a square pipe meeting size requirements is prepared from the semi-finished round pipe through a two-pass drawing method, wherein the first pass is sink drawing, and the second pass is short mandrel liner drawing; and 3, heat treatment is carried out, wherein a roller bottom type heat treatment furnace is adopted for the finished product for solid solution heat treatment, and the heat treatment process comprises four stages. The stainless steel square pipe can be applied to waste heat exhaust heat exchangers of third-generation nuclear reactors such as AP1000, CAP1000, CAP1400 and Hualong One, has the special section shape, high corrosion resistance, high surface smoothness and high boundary dimension precision and is required to pass strict ultrasonic flaw detection and liquid penetrating tests.

The invention discloses a heat treatment process of a titanium alloy, and belongs to the technical field of material science. The heat treatment process is mainly as follows: the heating temperature T of the first heating treatment is greater than or equal to (Tbeta-50) DEG C and less than or equal to (Tbeta+60) DEG C, the holding time t is equal to eta 1*delta max, the delta max is the maximum section thickness of a titanium alloy forged piece, the eta 1 is a heating coefficient, the value of the heating coefficient is 0.6-1.5min / mm, after the heat preservation on the forged piece is completed, the forged piece is discharged from a furnace and is subjected to air cooling, wind cooling, oil cooling or water cooling to a room temperature; the heating temperature T of the second heating treatment is greater than or equal to 650 DEG C and less than 780 DEG C, the holding time t is equal to (eta 2*delta max) / 2, the delta max is the maximum section thickness of the titanium alloy forged piece, the eta 2 is a heating coefficient, the value of the heating coefficient is 0.3-1.2min / mm, after the heat preservation on the forged piece is completed, the forged piece is discharged from the furnace and is subjected to air cooling to a room temperature; and the heating temperature T of the third heating treatment is greater than or equal to 480 DEG C and less than 650 DEG C, the holding time t is greater than or equal to 240min and less than or equal to 600min, and after the heat preservation on the forged piece is completed, the forged piece is discharged from the furnace and is subjected to air cooling to a room temperature. The heat treatment process solves the problems that after near-beta, metastable beta-type and fully-stable beta-type titanium alloys are subjected to solution treatment and ageing, the side and heart of the forged piece have large difference in structure properties, and is particularly suitable for preparing the high-strength titanium alloy forged piece with uniform structure properties and a large section / variable cross section.

The invention relates to a high-strength ultra-thick steel plate and a production method thereof. The chemical components of the steel plate include, by weight, 0.0025-0.025% of C, 0.16-0.36% of Si, 0.85-1.15% of Mn, 2.1-4.5% of Ni, 0.8-1.2% of Cu, 0.008-0.035% of Ti, 0.8-1.2% of Al and the balance Fe and unavoidable impurities. The high-strength ultra-thick steel plate adopts an ultra-low carbon component, the alloy contents of Ni, Cu, Al and Ti are reasonably configured, a normalizing plus tempering process is adopted, and three nanoscale intermetallic compounds of Ni3Al, Ni3Cu and Ni3Ti and a Cu-rich phase are sufficiently formed in the tempering process. The thickness of the steel plate made from the components and through the process is larger than or equal to 100 mm, the yield strength Rp0.2 is larger than or equal to 900 MPa, the tensile strength Rm is larger than or equal to 1000 MPa, the percentage elongation after fracture is larger than or equal to 12%, the welding performance, cold bending performance and a plate profile are good, the grain performance in the thickness direction is uniform, and a plate thickness effect is avoided. The steel plate produced through the method can be widely applied to various large-thickness steel plate application fields such as heavy engineering machinery, large building structures and bridge structures.

The invention discloses a manufacturing method of cold-rolled medium-high carbon alloy structural steel with the thickness ranging from 0.1 mm to 0.4 mm. The cold-rolled medium-high carbon alloy structural steel is prepared from components in percentage by weight as follows: 0.25%-0.55% of C, 0.15%-0.35% of Si, 0.10%-2.0% of Mn, 0.10%-2.0% of Cr, 0.010%-0.030% of Alt, less than or equal to 0.015% of P, less than or equal to 0.005% of S, no more than 0.3% of other added alloy elements and the balance of Fe and inevitable impurity elements. The manufacturing method comprises steps as follows: smelting, refining, continuous casting, heating, finish rolling, pickling, cold rolling, intermediate annealing, cold rolling, intermediate annealing, cold rolling and finished product annealing. Through control on inclusions in the steel, three times of cold rolling and three times of annealing, a cold-rolled medium-high carbon alloy structural steel strip with the thickness ranging from 0.1 mm to 0.4 mm is obtained. The total reduction rate of first-time cold rolling and second-time cold rolling is controlled to be larger than or equal to 50%, and the single-pass reduction rate is larger than or equal to 10%, so that lamellar carbide in different areas are crushed, the carbide is evenly separated out in the shape of fine particles through long-time low-temperature intermediate annealing, the strength is further reduced, and the plasticity is further improved.

The invention relates to a production technology of a power transmission material, in particular to a manufacturing method of a high-strength and high-conductivity aluminum-magnesium-silicon alloy contact tube bus. The manufacturing method is characterized in that a selected bus blank is prepared from, by weight, 0.40-0.90% of Mg, 0.50-0.9% of Si, 0.10-0.30% of Cu, 0.03-0.08% of B, 0.10-0.25% of rare earth, 0.01-0.1% of Be, smaller than or equal to 0.25% of Fe, smaller than 0.05% of Cr+V+Ti+Mn and the balance Al; then, preparing materials comprising the components are subjected to smelting and semicontinuous casting to form the tube blank, and the tube blank is subjected to planetary rolling, drawing and artificial aging treatment to form the alloy tube bus. By means of the method, the property uniformity of the alloy tube bus is improved, the production efficiency is improved, and the yield is increased; the tube bus produced with the method greatly exceeds the national standard and is widely applied to the power industry.

The invention discloses low-temperature engineering steel with yield strength not lower than 550MPa. The low-temperature engineering steel with yield strength not lower than 550MPa comprises the following components in percentage by weight: 0.04%-0.18% of C, 0.15%-0.50% of Si, 1.63%-2.00% of Mn, not more than 0..015% of P, not more than 0.008% of S, 0.05%-0.12% of Nb+Ti, 0.20%-0.4% of Mo+Cr, and 0.015%-0.05% of Als; the production steps are as follows: smelting and continuously casting to form blank, heating up the casting blank; rolling in a segmented manner by adopting a TMCP (Thermo-Mechanical Control Process); cooling; and straightening for the future use. The low-temperature engineering steel with yield strength not lower than 550MPa disclosed by the invention is not only capable of producing a steel plate with the thickness bigger than 80mm; the steel plate is uniform in tissue performance in the thickness direction, better in low-temperature impact toughness, i.e., impact power being not less than 100J at (-)60 DEG C, suitable for manufacturing engineering machinery that works in an extremely cold environment. The casting blank has center segregation C lower than 1.5 level and center porosity lower than 0.5 level; the low-temperature engineering steel is free of Ni and relatively low in content of Cr, Mo and other micro alloys, so that the cost is greatly lowered; the TMCP is adopted for producing without the processes including thermal treatment, PRC (Pre-stressed Reinforced Concrete), stacking slow-cooling and the like, and any other equipment is not needed to be added, so that the production process is simple and the production efficiency is high.

The invention discloses a manufacturing method of a 0.4-0.8 mm thick high-carbon alloy structural steel. The structural steel comprises the following components in percentage by weight: 0.25-0.55% of C, 0.15-0.35% of Si, 0.10-2.0% of Mn, 0.10-2.0% of Cr, less than or equal to 0.030% of Alt, less than or equal to 0.020% of P, less than or equal to 0.010% of S, no more than 0.3% of other added alloy elements, and the balance of iron and inevitable impurity elements. The manufacturing method comprises finish rolling, acid pickling, first cold rolling, intermediate annealing, second cold rolling, and finished product annealing. The product of the target thickness specification, which is obtained through twice cold rolling and twice annealing for a hot-rolled product that is previously pickled with acid, has good formability and surface quality; precise parts complex in shape and high in precision can be manufactured; in addition, the technical problems of a failure in interpenetration caused by deformation due to a high thickness and a low single-pass cold-rolling reduction ratio of a cold-rooked product and poor formability of the steel strip due to no annealing after the completion of the second cold tooling in the prior art are solved.

The invention discloses a 75Cr hot-rolled plate coil produced from thin sheet billets through continuous casting and continuous rolling and a production method thereof. The 75Cr hot-rolled plate coil comprises the following chemical ingredients in percentage by weight: 0.73-0.78% of C, 0.25-0.40% of Si, 0.65-0.90% of Mn, not higher than 0.020% of P, not higher than 0.012% of S, 0.30-0.60% of Cr, 0.015-0.03% of Als and the balance of Fe and inevitable impurities. The production method has the advantages that the production problems of large liquid level fluctuation, caking, unstable heat flow and the like appearing during the continuous casting of thin sheet billets under the condition of high pulling rate and the quality problems of surface crackle, center segregation, center porosity and the like of casting blanks are solved, and a stable production technology for 75Cr steel in a thin-sheet continuous casting and continuous rolling production line is realized. The 75Cr plate coil has the advantages that the surface quality is good, cracks and slag inclusions are not discovered, the structure property is uniform, the tensile strength is 920-1010MPa, the yield strength is 490-820MPa, the elongation percentage is 13-24%, and the Brinell hardness is 270-320HBW.

The invention discloses a 1200MPa-grade ultra-fast cold-rolled double-phase steel plate and a preparation method thereof. The steel plate comprises the chemical components of, by mass, 0.12-0.17% of C, 0.3-0.6% of Si, 2.0-2.4% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.03-0.06% of Als, 0.03-0.06% of Ti, less than or equal to 0.005% of N, and the balance being Feand unavoidable impurities. The preparation method includes smelting, continuous casting, hot rolling, cold rolling, annealing, and leveling processes. By adoption of the design of Ti-microalloying and low-alloying composition, the continuous retreating process is utilized; the water-cooling is ultra-fast; the hardenability of the steel plate is improved; a cold-rolled dual-phase steel with ferrite and martensite biphasic structure morphology is obtained; the structure is uniform; the strength of extension reaches 1200 MPa or more; and the mechanical properties are excellent.

The invention relates to a method for continuously extruding and molding zinc alloy structural materials, belonging to the technical field of plastic molding of zinc alloy tubing, section bar and wire stocks. In the technology, the plastic processing performance of zinc and alloy thereof can be dramatically improved by the method of modified fine grain strengthening and polishing, and deformation strengthening-great cutting deformation mode is in favor of refining crystals. Sufficient extruding force and heat quantity can be generated by utilizing strong friction of the continuously extruding technique on the zinc alloy structural material stock such as rod materials, granules or molten metal and the like and the rotary extruding wheels of the extruding device, thus directly extruding the zinc alloy structural material stock into finished products by the great cutting deformation mode. The invention solves the problems of long flow, high energy consumption caused by multiple heating, low material utilization rate, high production cost and the like existing in the current conventional techniques.

The invention relates to a device for continuously extruding and compositing a laminar composite electric contact material. The device comprises an extruding wheel, and a compacting wheel and a groove-sealing block, which are arranged along a material transporting direction around the periphery of the extruding wheel, wherein an extruding wheel groove is formed in the periphery above the extruding wheel, a plug head is arranged in front of the extruding wheel groove, an extruding channel for enabling a composite layer blank to generate plastic deformation is formed in a section of the extruding wheel grooved surrounded by the groove-sealing block and the plug head, an inlet mould and an outlet mould are arranged under the extruding channel, the place at which the inlet mould is over against an outlet under the extruding channel is provided with a material inlet, the material inlet is the place at which the inlet mould is contacted with the outlet mould, and the material inlet between the inlet mould and the outlet mould forms a composite cavity. A seal block is arranged at the right of the inlet mould, a seal block inlet is provided with a cutter, an air inlet hole is formed in the seal block, an extruding boot base is arranged under the inlet mould and the outlet mould, and the groove-sealing block, the plug head inlet mould and the plug head outlet mould are arranged inside the extruding boot base. After the device provided by the invention is used, the compositing which is high in efficiency, low in energy consumption as well as simple and effective in technology can be realized.

The invention belongs to the technical field of preparation of titanium alloy wires, and particularly relates to a method for controlling homogeneity of structure properties of high-strength and high-plasticity TB6 titanium alloy wires. The method comprises the following steps: carrying out multi-pass large deformation hot rolling on a TB6 titanium alloy bar with the specification of phi 40mm- phi45mm* 800mm-1200mm at first to obtain a bar with the specification of phi 9 mm-phi 10 mm; then carrying out single-phase region solid-solution treatment and then carrying out cold rolling, and controlling total deformation of cold rolling to be 15-36% to obtain a wire with the specification of phi 6 mm-phi 7 mm; and finally, carrying out ageing treatment on the wire at the temperature of 520-560 DEG C. The method is simple in process parameter setting, convenient to operate and high in process controllability, and the tensile strength sigma b of the wire in an aged state at the room temperature is greater than or equal to 1050 MPa, the yield strength sigma 0.2 is greater than or equal to 1000 MPa, the elongation delta 5 is greater than or equal to 15%, the percentage reduction of area psiis greater than or equal to 50%, the batch stability is high, and the repeatability is good.

The invention discloses 355MPa-grade low-alloy high-fatigue-strength steel and relates to the technical field of steel smelting. The thickness of a steel plate is 6-60 mm. The chemical ingredients ofthe 355MPa-grade low-alloy high-fatigue-strength steel comprise, by mass percentage, 0.12%-0.23% of C, 0.10%-0.60% of Si, 0.80%-1.90% of Mn, smaller than 0.018% of P, smaller than 0.008% of S, 0-0.060% of Nb, 0-0.15% of V, 0-0.12% of Ti and 0.010%-0.050% of Al. The adopted alloy ingredient design is to conduct controlled rolling and controlled cooling to obtain uniform and fine ferrite+pearlite structure, and then good mechanical performance and anti-fatigue performance are obtained.

The invention discloses a round steel all-purpose method rolling technology, comprising the steps that raw blanks are rolled into round blanks with middle fracture surfaces in a rough rolling unit; and the round blanks with the middle fracture surfaces are subjected to all-purpose method continuous rolling deformation or all-purpose method reciprocating rolling deformation for no less than two passes to be rolled into round steel products. By using the round steel all-purpose method rolling technology, the product size precision can be obviously improved, the problem that the out-of-roundness of the round steel products is severer is solved, the production specification ranges of smooth round bars and deformed steel bars are widened, the deformation of each pass is improved, the rolling deformation pass is reduced, the production efficiency is improved, the surface quality of rolled round steel is improved, the internal stress of rolled pieces after rolling is improved, the product yield is improved, and the rolling load, the production energy consumption and the production cost are reduced.

The invention relates to a method for continuously extruding and compositing a laminar composite electric contact material. The method comprises the following steps of: firstly, selecting precious-cheap metal combination, pretreating, and compositing a precious metal blank with a cheap metal blank in the sate of semi-fusion under the drive of a frictional force of an extruding wheel to obtain a composite product with high interface combination quality, so as to obtain a required electric connect component. After the method provided by the invention is used, the laminar compositing of the electric contact material can be realized according to the continuously extruding and compositing, so that the precious metal can be saved, the combination property of the material can be further improved, the product with high interface combination quality and high size precision can be produced, and the serialization, the short technological process and the near net shape can be further realized; therefore, the method is novel and used for preparing the laminar composite electric contact material.

The invention provides a low-cost and high-performance titanium alloy short process forging process. The process includes the following steps that first, ingot casting is heated to be 1150 DEG C to 1200 DEG C, one heating number forging is conducted, and a forging stock is obtained after cogging; second, the blank obtained in the first step is heated to be 1000 DEG C to 1050 DEG C, and one heatingnumber reversing forging is conducted to obtain a forging stock; third, the blank obtained in the second step is heated to be 1000 DEG C to 1050 DEG C, and one heating number reversing forging is conducted to obtain a forging stock; and fourth, the forging stock in the third step is heated to be 30 DEG C to 50 DEG C below the beta phase transformation point temperature, and 1-3 heating number forging is conducted to obtain a forging stock with uniform structure properties. According to the low-cost and high-performance titanium alloy short process forging process, the technical problems of titanium alloy structure homogenization and fine crystallization through less forging heating numbers are successfully solved, the cost is lowered, and at the same time, the performance index of a titanium alloy is ensured.

The invention provides a method for producing high-quality 75Cr1 hot-rolled sheet steel based on the continuous thin slab casting and rolling process, which mainly adopts the following process flow: smelting, refining, continuous thin slab casting, soaking, hot continuous rolling, cooling and coiling. The superheat T of molten steel is larger than 30 DEG C and less than or equal to 45 DEG C, the charging temperature T of the cast slab is larger than or equal to 900 DEG C and less than or equal to 1050 DEG C, the finish rolling temperature T is larger than or equal to 850 DEG C and less than or equal to 950 DEG C, the coiling temperature T is larger than or equal to 550 DEG C and less than or equal to 630 DEG C, and the drawing speed S of continuous casting is larger than or equal to 3.5m / min and less than or equal to 5.5m / min; mold flux casting is adopted; and the chemical composition of molten steel is as follows: 0.70 percent to 0.80 percent by weight of C, 0.20 percent to 0.45 percent by weight of Si, 0.60 percent to 0.90 percent by weight of Mn, 0.025 percent by weight or less of P, 0.025 percent by weight or less of S, 0.30 percent to 0.60 percent by weight of Cr and 0.02 percent to 0.08 percent by weight of V. When the method is adopted to produce the 75Cr1 hot-rolled sheet steel, the segregation, porosity and cracks of the cast slab are reduced, and the 75Cr1 hot-rolled sheet steel is characterized by uniform microstructure and properties and high fatigue resistance.