721results about How to "Reduce plasticity" patented technology

This invention relates to an electromagnetic progressive shaping method for plate moving coils and a device, in which, said device includes a computer control system, an electromagnetic force generation system and a three-shaft digital control shaping system including a plate clamping elevating device, a supporting model frame and an electromagnetic shaping clamping rod, in which, the computer controls the coil to move downward along the contour of a model profile from the top according to the contour data of the model profile and the plate is formed partly relying on the magnetic force of coil till to the bottom of the model and finish the entire process.

The invention relates to a low-carbon ultra-deep punching cold-rolling steel sheet and a production method thereof, belonging to the technical field of steel smelting and calendaring. The steel sheet comprises the following chemical components in weigh percentage: 0.006%-0.012% of C, 0.15%-0.20% of Mn, 0.030%-0.070% of Als, 0.015% of Si or less, 0.012% of P or less, 0.010% of S oe less, not more than 0.0030% of N or less, 0.0035% percent of O or less and the balance of Fe and inevitable impurities. Based on a ZSP sheet blank continuous casting and rolling process, the production method comprises the following working procedures of steel smelting, continuous casting, heating, hot rolling, cooling and curling, acid washing and cold rolling, and annealing and flattening. The steel sheet has excellent mechanical property and stamping forming property and simple chemical component and is suitable for punching products needing ultra-deep punching, such as fuel tank caps of automobiles; and the production method has the advantages of easy operation, low production cost, energy saving and consumption reduction and is beneficial to generalization and application.

A composite system comprises a base layer, a capping layer, and at least one core geocell layer. The base layer and capping layer are stacked below and above the core geocell layer, which is infilled with a low quality material. In specific embodiments, the base layer and capping layer are each geocells infilled with a high quality material. This composite system meets engineering specifications economically.

The invention discloses a B-P-T steel tube and a preparation method thereof. The steel tube comprises carbon, manganese, chromium, silicon, aluminum, sulphur, phosphorus and ferrum. The preparation method comprises steps of performing alloying for above components, producing a Bainite steel tube through a converter, refining and rolling and obtaining the B-P-T steel tube through a P process and a B process. The plastic property of the steel tube can be increased by more than 50% compared with former plastic property, the steel tube can be applied in the field of conveying of high-performance and high-abrasion steel tubes and the current technical problem of low plastic property is solved. The process is simple, the cost is low and the product quality is good.

The invention discloses economical high-strength binding strip steel with tensile strength more than or equal to 1,000 MPa, and a manufacturing method thereof. The steel comprises the following components in percentage by weight: 0.25 to 0.42 percent of C, 1.0 to 2.0 percent of Mn, less than or equal to 0.45 percent of Si, less than or equal to 0.04 percent of S, less than or equal to 0.04 percent of P, less than or equal to 0.08 percent of Al, and the balance of Fe and inevitable impurities. The manufacturing method comprises a steelmaking process for clean steel smelting controlled in inclusion forms, a hot rolling process, a cold rolling process and a bluing-annealing process. The manufacturing method can realize the clean production of high-strength binding strip steel, reduces production processes, improves the production efficiency, and can obtain the economical high-strength binding strip steel with well matched strength and plasticity and the tensile strength more than or equal to 1,000 MPa while significantly reducing production cost.

The invention provides Al-Mg high magnesium alloys for automobile body sheets and a manufacturing method thereof, belonging to the technical field of alloy materials. The invention solves the following problem: the existing 5083 series alloys have insufficient strength and poor impact resistance and surface quality when being used for the automobile bodies. The alloys comprise the following components in percentage by weight: 0.01-0.2wt% of Cu, 0.6-0.9wt% of Mn, 4.9-5.6wt% of Mg; 0.05-0.2wt% of Cr, 0.1-1.5wt% of Zn, 0.005-0.01wt% of Be, 0.05-0.2wt% of Ti, 0.05-0.2wt% of Zr, not more than 0.2wt% of Si, not more than 0.3wt% of Fe and the balance Al. The alloys have the advantages of high strength and good plasticity and corrosion resistance.

The invention relates to hot-work die steel for an extrusion wheel and a manufacturing method of the die steel. The invention adopts the technical scheme that the manufacturing method comprises the following steps: hot-forging after scrap steel or molten iron and scrap steel are smelted in an electric furnace and are subjected to electroslag remelting or vacuum induction melting and then carry out spheroidizing annealing at a temperature of 700-880 DEG C; quenching at a temperature of 1,020-1,120 DEG C and tempering at a temperature of 530-650 DEG C, wherein the hot-work die steel has a hardness of up to 40-52HRC and a tensile strength of up to 1,850-1,955MPa. The hot-work die steel comprises the following chemical components in percentage by weight: 0.30-0.50wt% of C, 0.80-1.20wt% of Si, 0.2-0.5wt% of Mn, 3.00-5.00wt% of Cr, 1.00-1.50wt% of Mo, 0.70-1.20wt% of V, 0.005-0.03wt% of N and less than 0.030wt% of P, less than 0.030wt% of S and the balances of Fe and inevitable impurities. The steel has the characteristics of low cost, good thermal fatigue property, high heat stability and excellent comprehensive property and can be used for manufacturing the extrusion wheel of a continuously-extrusion-molded coating machine and other hot-work dies.

The invention relates to a corrosion resistant niobium-titanium alloy, and a method for manufacturing plates and pipes with the corrosion resistant niobium-titanium alloy, wherein the corrosion resistant niobium-titanium alloy contains the following components by weight: 0.1-4.9% o Nb, not more than 0.08% of C, not more than 0.03% of N, not more than 0.012% of H, not more than 0.1% of O, not morethan 0.1% of Fe, and the balance of Ti. In Ti-(0.8-6%) Nb alloy pipes disclosed by the invention, titanium is as a matrix; little niobium is added; mechanical property of the niobium is improved by asolid-solution strengthening way; shearing strength and tensile strength of the alloy are higher than pure titanium; the tensile strength is increased by 10-20%; good plasticity and formability are kept; cold working performance is excellent; the niobium is added to further increase corrosion resistance of titanium and enlarge corrosion resistant range of titanium, so that the corrosion resistantniobium-titanium alloy is a good easily-formed corrosion resistant material.

The invention relates to a post-rolling cooling control method for high-Cr (the alloy content accounts for 0.30 percent-0.35 percent) SWRH82B wire rods. The method comprises the steps that post-rolling spinning temperature, cooling speed before spinning phase change, phase-transition temperature range, phase-transition cooling speed, Stelmor roller speed, fan delivery and Jialing air distribution are combined and controlled, and production equipment is adjusted to stabilize spinning mode so that the purpose of the stable production can be achieved. The spinning temperature is controlled to range from 860 DEG C to 880 DEG C. The cooling speed before post-rolling phase-transition is controlled to range from 10.0 DEG C/s to 14.0 DEG C/s. The phase-transition temperature is controlled to range from 580 DEG C to620 DEG C. The cooling speed in a phase-transition area is controlled to range from 1.5 DEG C/s to 3.0 DEG C/s. The base speed of the inlet segment of a Stelmor roller bed is controlled to range from 0.6 m/s to1.0m/s. After the technical scheme of the post-rolling cooling control of the wire rods is applied and implemented, it can be guaranteed that high strength is achieved, and plasticity does not decrease but is improved. Moreover, the situation that as cleaning rods are cooled in a non-uniform mode, so that the local positions produce low-temperature shift tissue such as martensite is avoided, and the uniformity of the cleaning rod tissue and the mechanical performance is guaranteed.

The invention discloses high-strength nodular cast iron QT900-6 which consists of the following elements in percentage by weight: 3.2-3.7% of C, 2.4-2.8% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.03% of P, 0.005-0.02% of S, 0.8-1.4% of Cu and the balance of Fe and unavoidable trace elements. The high-strength nodular cast iron QT900-6 has high compressive strength, high yield strength and excellent mechanical property.

The invention discloses 600 MPa level automobile axle housing steel and a production method of the 600 MPa level automobile axle housing steel. Compositions of the steel comprise, by weight, 0.21 percent to 0.26 percent of C, 0.51 percent to 0.6 percent of Si, 1.1 percent to 1.5 percent of Mn, 0.01 percent to 0.06 percent of Al, P smaller than or equal to 0.02 percent, S smaller than or equal to 0.01 percent, 0.05 percent to 0.06 percent of V, 0.012 percent to 0.016 percent of N, and the balance Fe and inevitable impurities. The ratio of V to N is smaller than or equal to 5:1. According to the method, the accurate V content, the accurate N content and the controlled rolling and controlled cooling process window are designed, hot rolling strip steel for a 600 MPa level automobile axle housing is produced, the strip steel has the good strength and toughness, and meanwhile various mechanical performance indexes of the axle housing after hot forming at the temperature more than 800 DEG C can be ensured. The method can be applied to automobile axle housing production, the thickness of materials can be effectively reduced, and on the premise that the safety of an automobile is ensured, the lightweight aim can be effectively achieved.

The invention relates to low-density ultrahigh-strength steel and a preparation method thereof, and belongs to the field of metal materials. The steel comprises the following chemical components in percentage by mass: 0.6 to 1.6 percent of C, 5 to 10 percent of Al, 15 to 30 percent of Mn, 0.01 to 0.2 percent of Nb, 0.1 to 3 percent of Mo, less than or equal to 5 percent of Cr, less than or equal to 0.5 percent of Ti, less than or equal to 2 percent of Si, less than or equal to 0.6 percent of B, and the balance of Fe and unavoidable impurity elements. According to the low-density ultrahigh-strength steel and the preparation method thereof, a NbMoC phase which is finely dispersed precipitates by compounding and adding the Nb and the Mo; precipitation is strengthened by cooperating with a kappa-carbide; the tensile strength reaches over 1,350 MPa, the elongation reaches over 10 percent and the density is 6.8 to 7.0 g/cm<3>; the low-density ultrahigh-strength steel is low in cost, is suitable for light weight of traffic transportation tools, such as vehicles and airplanes, and meets the development concept of energy conservation and emission reduction.

The invention relates to a superlarge thickness hydrogen chromium molybdenum steel plate for hydrogenation equipment and a manufacture method thereof, and belongs to the technical field of ferrous metallurgy. A technical scheme is as below: the steel plate comprises the following components by weight: no more than 0.15% of C, no more than 0.10% of Si, 0.300.60% of Mn, no more than 0.007% of P, no more than 0.005% of S, 2.00-2.50% Cr, 0.90-1.10% of Mo, no more than 0.02% of Nb, no more than 0.20% of Cu, no more than 0.20% of Ni, no more than 0.003% of Sb, no more than 0.005% of Sn, no more than 0.016% of As, no more than 0.003% of O, N no more than 0.008%, no more than 0.0002% of H, no more than 0.03 of Ti and the balance of Fe and unavoidable impurities; a round steel ingot with piece weight of 80 tons is produced by electric arc furnace smelting and casting; and the steel ingot is subjected to forging cogging, rolling and a heat treatment process including normalizing, accelerated cooling and tempering to prepare the superlarge thickness chromium molybdenum steel plate with a maximum thickness of 256mm for hydrogenation equipment. A finished steel plate has maximum single weight reaching 60 tons, good cold bending property, no cracking during material manufacture and good resilience. The method provided by the invention reduces labor intensity, saves time and improves the utilization rate of materials.

The invention discloses a production process of rebar for concrete. The production process comprises the following steps of: removing scales on a hot rolling steel wire rod; straightening the hot rolling steel wire rod after forming with die drawing or roller die drawing, or directly straightening the hot rolling steel wire rod without drawing; leading the hot rolling steel wire rod to continuously pass through a heating ring and a cooling water ring by a high-medium frequency induction furnace; heating the rebar to Ac1 above so as to carry out austenization; quenching and cooling the rebar by spraying water; executing drawing temper, and applying tension on the rebar when tempering; and cooling the rebar by spraying water to obtain the rebar for the concrete.

The invention discloses a thick chromium-molybdenum steel plate for hydrogenation equipment, and also discloses a production method of a steel plate. The steel plate comprises the following components by weight percent: 0.12%-0.15% of C, 0.02%-0.07% of Si, 0.50%-0.60% of Mn, less than or equal to 0.007% of P, less than or equal to 0.005% of S, 2.35%-2.50% of Cr, 0.95%-1.10% of Mo, 0.012%-0.02% ofNb, less than or equal to 0.20% of Cu, less than or equal to 0.20% of Ni, less than or equal to 0.003% of Sb, less than or equal to 0.005% of Sn, less than or equal to 0.016% of As, less than or equal to 0.003% of O, less than or equal to 0.008% of N and less or equal to 0.0002% of H, the balance of Fe and inevitable impurities. For the steel plate, an electroslag remelting technology is adopted,electroslag ingot with the maximum piece weight being 50t is melted, and the maximum thickness of the produced thick chromium-molybdenum steel plate for the hydrogenation equipment can achieve 198mm,and the maximum piece weight of the single-piece finished steel plate can achieve 37.2t by a heating-rolling technology and thermal-processing production equipment of normalizing plus accelerated cooling plus tempering.

The invention discloses a high-strength and high-plasticity magnesium alloy. The high-strength and high-plasticity magnesium alloy comprises the following components in percentage by mass: 3.0-4.5% of Ni, 4.0-5.0% of Y, 0.01-0.1% of Zr, not more than 0.15% of inevitable impurities and the balance of magnesium. According to the high-strength and high-plasticity magnesium alloy disclosed by the invention, Y and Ni elements are simultaneously added into a magnesium matrix, and in the smelting and molding process of the alloy, Y and Ni form Mg2Ni and Mg12YNi phases with the magnesium matrix, wherein the Mg12YNi phase is a long-period stacking ordered structure (LPSO), so that the strength of the alloy can be improved, and the plasticity of the alloy can also be improved; and Mg2Ni can improve the strength of the alloy by a strengthening mechanism of the second phase. According to the high-strength and high-plasticity magnesium alloy disclosed by the invention, an appropriate amount of Zr element is further added into the alloy, and zirconium can be dispersed and distributed in the matrix in an elemental form by controlling the smelting and molding process to play a role in refining grains.

The invention designs a composite material. The composite material comprises carbon-fiber perform, matrix carbon, filler and diamond-like carbon, wherein the matrix carbon is uniformly adhered on the carbon fiber of the perform to form the carbon-fiber perform with the matrix carbon; the filler fills the inside of the carbon-fiber perform with the matrix carbon and coats the outside of the carbon-fiber perform with the matrix carbon to form a semifinished product; the diamond-like carbon comprises a diamond-like carbon layer coated on the semifinished product; and the filler contains a Ti element, a Si element, a C element and a Mo element. The composite material has the advantages that a method of combining four processes of CVI, SI, RMI and PECVD to prepare a finished product with the advantages of high compactness, low thermal expansion coefficient and friction coefficient, high self-lubricating property, high thermal conductivity, oxidation resistance, thermal shock resistance, ablation resistance, wear resistance, high strength and toughness and the like; and simultaneously, the process is simple, the preparation period is short, the equipment requirement is low, the cost is low, net shaping can be realized and convenience is brought for large-scale industrial application.

The invention relates to a low silver copper base medium temperature brazing filler metal applicable to braze welding of workpieces such as copper and copper alloy, copper and steel, belonging to the field of medium temperature brazing material. The formula and content of the low silver copper base medium temperature brazing filler by weight percentage is as follows: Ag: 1.8-5%, P: 5.5-7.5%, In: 0.5-2.5%, Ni: 0.01-1%, the rest: Cu. The invention has the advantages of rational design of formula, low manufacture cost, relatively low melting temperature of the brazing filler metal when welding copper and copper alloy and copper and bundy tubes, good wetting property and fluidness, smooth and bright surface of soldered connection, high mechanical strength, fine processing property of braze welding, stable quality and good uniformity and capability of replacing noble metal silver brazing filler metal BAg25CuZnSn.

The invention relates to a steel metallurgical material, in particular to a tinning substrate for deep-punching food cans and a production method thereof. The tinning substrate comprises the following chemical element compositions in percentage by weight: less than or equal to 0.04% of C; less than or equal to 0.02% of Si, 0.20-0.25% of Mn, less than or equal to 0.02% of P, less than or equal to 0.018% of S, 0.005-0.040% of Als, and the balance iron and unavoidable inclusion. The production method comprises the following processes: smelting, continuous casting, heating, hot rolling, cooling and reeling, pickling and cold rolling, and annealing and leveling, wherein the heating temperature is 1210 DEG C, the primary rolling temperature is 1100-1150 DEG C, the final rolling temperature is 890+/-10 DEG C, the reeling temperature is 560+/-15 DEG C, the annealing temperature is 670-690 DEG C, and others are performed as conventional processes. The invention has small production control difficulty, low cost, stable performance and high can manufacturing percent of pass, and is suitable for manufacturing deep-punching food cans and can covers with more complex transformation.

The invention relates to a Mo-La-Ce rare-earth molybdenum alloy wire and its process for preparing. The invention is characterized in that the said molybdenum alloy wire contains 0.4 %-1.0% lanthanum oxide and cerium oxide(mass %) and the proportion by weight of lanthanum oxide and cerium oxide is 4:1. The process for preparing is different from the traditional powder metallurgy productive technology, which includes performing vacuum drying and liquid-solid doping for molybdenum dioxide, lanthanum nitrate and cerium nitrate solution, then performing secondary reduction to prepare binary rare-earth doping molybdenum powder, finally preparing rare-earth doping molybdenum wire with Mo-La-Ce of 0.5-0.8mm diameter by impression, agglomeration and pressure processing procedure. The raw materials of this invention is cheap and facile, and the prepared molybdenum wire is of high tensile strength, strong abrasive resistance and simple process and is inflexible, and has high rate of finished products, good compatibility and long durability.

The invention relates to the technical field of steel and iron materials and in particular relates to an ER70S-6 hot rolled wire rod and a preparation method thereof. In the process steps, deoxidation treatment is performed on the liquid steel by use of a non-calcium alloy material to avoid the increase of the calcium content in the steel, and furthermore, splashing in the process of welding is avoided. The carbon content in the steel is reduced so that the strength of the wire rod can be reduced; the percentage of area reduction and the percentage elongation of the wire rod are increased, in other words, the plasticity of the wire rod is improved, and consequently, the wire rod can be drawn into a welding wire directly without annealing and the production cost of a welding wire factory is reduced; besides, in the preparation process, the quality of the ER70S-6 hot rolled wire rod is improved by controlling the contents of various elements, such as carbon, silicon and magnesium, so that the welding property of the welding wire is improved; in the cooling process of rolling, draught fans on an air cooling line are all turned off and thermal insulation covers are all closed so that the highest tensile strength of the wire rod does not exceed 550MPa and the plasticity of the wire rod is good.