49results about How to "High work hardening rate" patented technology

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 belongs to the technical field of steel materials, and relates to an ultralow-yield-ratio cold-rolled dual-phase steel and a manufacturing method thereof. Internal control chemical components of the dual-phase steel comprise 0.13%-0.18% of C, 0.30%-0.60% of Si, 1.7%-2.0% of Mn, 0.02%-0.070% of Al, 0.02%-0.05% of Nb and the balance Fe and other inevitable impurities. Simple chemical component design is adopted, the hot-rolling deformation heat treatment TMCP and the flexible continuous annealing process are combined to obtain a microscopic structure with fine grain ferrite, island martensite and 5%-7% of retained austenite, and therefore the uniform deformation capacity of materials is increased while the strong plasticity of the cold-rolled dual-phase steel is improved. The ultralow-yield-ratio cold-rolled dual-phase steel has the beneficial effects that good stamping performance, low process sensitivity and the ultralow yield ratio YS/TS which is smaller than or equal to 0.51 are achieved, springback generated after stamping can be reduced, and later deep machining of the automobile industry is facilitated.

The invention discloses a cold-rolled high-strength dual-phase sheet steel with 400MPa-level tensile strength for a car and a preparation method thereof, and belongs to the field of steel materials. The double-phase sheet steel adopts a ferrite-martensite dual-phase structure serving as the main structure and contains 4 to 9% of martensite and comprises the following chemical components by mass percent: 0.01 to 0.05% of C, 0.1 to 0.4% of Si, 1.2 to 1.6% of Mn, 0.1 to 0.4% of Cr, 0.02 to 0.05% of Als, not greater than 0.005% of N, not greater than 0.02% of P, not greater than 0.01% of S, and the balance of Fe and inevitable residual impurity elements. The preparation method comprises the steps of hot rolling, acid pickling, cold rolling and heat treating. The produced cold-rolled double-phase sheet steel has the yield strength of 200 to 250MPa, tensile strength of 400 to 450MPa and percentage of elongation of 30 to 35%.

The invention relates to a multi-pass drawing process method for manufacturing magnesium and magnesium alloy filaments. The prior production method has many middle annealing times, low production efficiency, low yield of a finished product, and high cost. The multi-pass drawing process method for manufacturing the magnesium and the magnesium alloy filaments comprises: a raw material of a fine crystal magnesium or magnesium alloy wire material with diameter of between phi 2 and 3 is selected; the raw material and a wire drawing mould are lubricated through a grease-type lube and are subjected to cold drawing for 5 to 12 times, and the cold drawing speed is between 120 and 150 mm/s; the raw material is recrystallized and annealed, the annealing temperature is between 400 and 420 DEG C, and the annealing time is between 1 and 3 minutes; and the process is repeated till the process is finished. The method is used for manufacturing the magnesium and the magnesium alloy filaments.

The invention discloses hot-rolled dual-phase steel in the 590MPa tensile strength grade and a method for manufacturing the hot-rolled dual-phase steel. The steel comprises, by weight, from 0.04% to 0.10% of C, from 1.10% to 1.50% of Mn, from 0.10% to 0.20% of Si, from 0.015% to 0.070% of Als, from 0.03% to 0.08% of P, lower than or equal to 0.008% of S, from 0.5% to 1.2% of Cr, the balance Fe and inevitable impurities. The method for manufacturing the steel includes molten iron desulfurization, converter smelting, vacuum treatment, continuous casting, sizing, plate blank heating, hot continuous rolling, laminar cooling and reeling. As proved by practice, the steel is high in tensile strength, low in yield ratio and excellent in cold stamping forming performance and fatigue resistance, a technological process of the method is simple, and the production cost is low.

The invention relates to low-density Ti3Al strengthened super-strength steel and a preparing method thereof, and belongs to the field of metal materials. The chemical components of the steel comprise, by mass percent, 0.5% to 1.5% of C, 15% to 30% of Mn, 5% to 10% of Al, 5% to 20% of Ti, not larger than 5% of Cr, not larger than 0.2% of Nb, not larger than 2% of Si, not larger than 0.6% of B and the balance Fe and inevitable impurities. Through adding of Ti, Ti3Al is formed, the Ti3Al and k-carbide can jointly generate precipitation strengthening, the steel has the super-high strength and the good plasticity while the density is effectively reduced, the tensile strength reaches above 1350MPa, the ductility reaches above 10%, the density ranges from 6.5 g/cm<3> to 6.9 g/cm/<3>, and the manufacturing requirement of automobile structural parts is met.

The invention discloses a method for producing tough iron-chromium-aluminium ferritic electrothermal alloy, which comprises the following steps: 1) raw material selection; 2) technological processes: a, vacuum melting; b, high-temperature vacuum refining; c, reductive slagging; d, temperature reduction and solidification; e, temperature rise and deoxidation; f, quenching and tempering and homogenization; and g, casting ingots. The product produced by the method has excellent corrosion resistance as well as good toughness, and is as applied to the material of a heating wire; and the heating wire has lower cost, the used temperature 300 DEG C higher, and longer service life than a nickel-chromium heating wire.

The invention discloses a high manganese steel which contains tungsten, and the high manganese steel contains chemical constituents in the following mass percent: C: 1.05%-1.35%, Si: 0.3%-0.9%, Mn: 11%-19%, W: 0.5%-1.5%, P<=0.070% and S<=0.045%, and the rest is Fe, furthermore, the high manganese steel also can contain a rare earth element RE, and the content of the RE is 0.01%-0.3%. The high manganese steel also can contain Cr and the content of the Cr is 1.2-2.5%. The high manganese steel which contains the tungsten of the invention is added with the elements of tungsten, rare earth element RE and chrome in particular when the content of the Mn is 16%-19%, which enables the whole high manganese steel to have the advantages of good toughness, high yield strength, high work hardening degree, better abrasive resistance and the like compared with the existing steel, and thereby the application range of the high manganese steel is enlarged. The high manganese steel of the invention is suitable for preparing fitting parts which are used in the working condition of abrasion and in particular to impact abrasion.

The invention relates to a non-heat treatment medium-strength aluminum alloy conductor material and a preparation method thereof, and belongs to the technical field of electrotechnical materials. The non-heat treatment medium-strength aluminum alloy conductor material comprises the following elements in percentage by weight: 0.35%-0.50% of iron, 0.10%-0.25% of copper, 0.01%-0.04% of magnesium, 0.001%-0.002% of boron, 0.02%-0.04% of rare earth (lanthanum or yttrium), impurity element silicon less than or equal to 0.11%, s(chromium+manganese+vanadium+titanium) less than or equal to 0.015%, less than or equal to 0.03% of each of other impurity elements and the balance of aluminum. The non-heat treatment medium-strength aluminum alloy conductor material disclosed by the invention can be used for enhancing the processing hardening rate of an aluminum alloy material to enhance the strength through an iron-containing second phase, copper and magnesium atom enrichment regions and dislocation interaction and enhancing the conductivity and elongation of an aluminum alloy through the matching of the iron, the copper, the magnesium, the rare earth lanthanum or yttrium and the boron. A medium-strength aluminum alloy wire manufactured by adopting the non-heat treatment medium-strength aluminum alloy conductor material can be used for solving the problem of continuous production bottleneck generated due to heat treatment, saving the power consumption and time consumption of heat treatment and reducing the cost and achieves the outstanding economic benefit.

The invention discloses high-toughness hot-rolled medium manganese steel with strength-ductility balance greater than 60 GPa.% and a preparation method, and belongs to the field of high-toughness automobile steel. The steel comprises the following chemical components of, in percentage by weight, 0.35-0.40% of C, 6.00 -6.30% of Mn, 2.20-2.35% of Al, 0-0.027% of Nb, 0.030 -0.074% of Si, 0.05% of P,0.02% of S, and the balance Fe and inevitable impurities. The preparation method comprises the steps of raw material preparation, smelting, casting, forging, hot rolling and two-phase region annealing. According to the high-toughness hot-rolled medium manganese steel, strength of extension is 1039-1183 MPa, after-fracture elongation rate is 43.5-64.8%, strength-ductility balance can reach more than 60 GPa.%, but not greater than 72GPa.%. Through reasonable component proportion and optimized two-phase region annealing process, morphology and proportion of a two-phase structure are controlled, TRIP and TWIP effects are effectively simulated to reach a high work hardening rate, the strength and the toughness of the medium manganese steel are greatly improved, and performance indexes of different components of an automobile are met.

The invention discloses a high-strength plastic vanadium microalloyed dual-phase steel seamless pipe and an on-line preparation method thereof. The seamless pipe is composed of the following chemical components in percentage by mass: 0.10-0.18% of C, 0.1-0.6% of Si, 1.1-1.6% of Mn, 0.16-0.20% of V, 0.01-0.03% of N, at most 0.006% of P, at most 0.005% of S, and the balance of Fe and other inevitable impurities. The intermediate-frequency induction heat treatment device of the thin-wall steel pipe is utilized and assisted by the vanadium microalloyed component design to produce the dual-phase steel seamless pipe with favorable comprehensive mechanical properties; the advantages of low yield-tensile ratio, high rate of work hardening, favorable strength and favorable elongation percentage of the dual-phase steel are matched and successfully applied to the field of production of steel pipes to efficiently substitute solid components with hollow components, thereby implementing light weight of the automobile; and meanwhile, the seamless pipe promotes further development of the internal high-pressure forming technique, and has wide application prospects.

The invention discloses 450MPa-grade hot-dip galvanized dual-phase steel and a production method thereof, and belongs to the field of galvanized automobile steel manufacturing, the 450MPa-grade hot-dip galvanized dual-phase steel adopts a low-carbon-low-manganese component design of trace Si, low Mo and high Cr, processes of coiling at a low temperature of 520-560 DEG C, slow cooling at a temperature of 640-660 DEG C and rapid cooling at a temperature of more than or equal to 10 DEG C are carried out, and the 450MPa-grade hot-dip galvanized dual-phase steel is prepared by matching a dew point in a furnace at a temperature of less than or equal to-40 DEG C and an oxygen content of less than or equal to 5ppm. And obtaining the 450MPa-grade hot-dip galvanized dual-phase steel under the atmosphere that the dew point of a furnace nose is not more than-20 DEG C. According to the produced hot-dip galvanized dual-phase steel with the tensile strength of 450 MPa, the uniform elongation is 18%-23%, the work hardening rate n value is not lower than 0.19, the after-fracture elongation A80 reaches up to 28%-33%, and the hot-dip galvanized dual-phase steel is suitable for being used as a high-drawing and high-flanging complex forming automobile part.

The invention relates to a high-work-hardening-ratio hot rolling Q&P steel plate and a preparing method thereof. According to the technical scheme, the high-work-hardening-ratio hot rolling Q&P steelplate comprises chemical components including, by weight percent, 0.15 to 0.20% of C, 0.60 to 1.0% of Si, 1.2 to 2.0% of Mn, 0.03 to 0.06% of Al, 0.03 to 0.06% of Nb, not larger than 0.020% of P, notlarger than 0.005% of S and the balance Fe and inevitable impurities. A casting blank is placed in a heating furnace, the charging temperature ranges from 700 DEG C to 900 DEG C, heating to 1180 DEG Cto 1230 DEG C is achieved, heat preservation is carried out for 50 to 90 min, heavy reduction is carried out in the first three passes, the reduction rate ranges from 40 to 60%, the final rolling temperature ranges from 800 DEG C to 880 DEG C, cooling to 650 DEG C to 720 DEG C is achieved, air cooling relaxation is carried out for 4 to 8 s, ferrite is precipitated, cooling to 340 DEG C to 400 DEGC is achieved, partition treatment is carried out, the partition treatment time is 10 to 60 s, water quenching to the room temperature is achieved, and the high-work-hardening-ratio hot rolling Q&P steel plate is obtained. The process is simple, the cost is low, and the made product is high in work hardening rate, good in mechanical property, high in strength and ductility product and excellent in forming performance.

The invention discloses a malleable iron-chromium-aluminum ferritic electrothermal alloy, which comprises the following chemical compositions in percentage by mass: less than or equal to 0.01 percent of C, less than or equal to 0.05 percent of N, less than or equal to 0.1 percent of Si, less than or equal to 0.08 percent of Mn, 21.5 to 31 percent of Cr, less than or equal to 3.0 to 6.0 percent of Al, less than or equal to 0.030 percent of P, less than or equal to 0.030 percent of S, and the balance of Fe and inevitable impurities. The malleable iron-chromium-aluminum ferritic electrothermal alloy not only has excellent corrosion resistance, but also has good toughness, lower cost than a nickel-chromium electric stove wire, service temperature 300 DEG C higher than the nickel-chromium electric stove wire and long service life.

The invention belongs to the technical field of alloys, and particularly relates to a high-strength, high-elasticity and bending-resistant copper alloy as well as a preparation method and application thereof. The high-strength, high-elasticity and bending-resistant copper alloy is prepared from the following elements in percentage by mass: 0.02-3.2% of Zn, 0.01-2.2% of Mg, 1.5-2.0% of Sn, 0.05-0.3% of Fe, 0.05-0.19% of Ni, 0.001-0.003% of Pb, 0.01-0.05% of P, 0.01-0.1% of strengthening elements and the balance of Cu, wherein the strengthening element is one or more of Ti, Co and V. The embodiment shows that the high-strength, high-elasticity and bending-resistant copper alloy has the tensile strength of 280-680 MPa, the ductility of 3-40%, the conductivity of 30-35% IACS, the elastic modulus of 108-113 GPa, and is bending-resistant.

The invention discloses a Ti-Al-Mo-Cr series beta titanium alloy with the ultralow elastic modulus and the ultrahigh work hardening rate. The Ti-Al-Mo-Cr series beta titanium alloy is composed of the following components of, in percentage by mass, 4.5%-5.5% of Al, 6.0%-7.0% of Mo, 2.5%-3.5% of Cr and the balance Ti and inevitable impurity elements. The invention further discloses a heat treatment process for carrying out solution treatment on the Ti-Al-Mo-Cr series beta titanium alloy at the temperature of (T-50 DEG C) to (T + 50 DEG C). According to the Ti-Al-Mo-Cr series beta titanium alloy with the ultralow elastic modulus and the ultrahigh work hardening rate, by designing the components and content of the titanium alloy, martensite phase transformation is easily induced when the titanium alloy deforms at room temperature, so that the elastic modulus of the alloy is reduced, and the ultrahigh work hardening rate is achieved; and according to the Ti-Al-Mo-Cr series beta titanium alloy with the ultralow elastic modulus and the ultrahigh work hardening rate, the solution treatment temperature of the Ti-Al-Mo-Cr series beta titanium alloy is controlled, so that the Ti-Al-Mo-Cr series beta titanium alloy is in an easily unstable state within a large temperature range, and the ultralow modulus and the ultrahigh work hardening rate performance of the Ti-Al-Mo-Cr series beta titanium alloy are guaranteed.

The invention provides a particle reinforced titanium-aluminum composite based on spinning deformation and a preparation method thereof. The preparation method comprises the following steps that a cold-rolled titanium alloy TA18 plate and an aluminum alloy LY12 plate serve as initial blanks for explosive welding, the cold-rolled titanium alloy TA18 plate is mechanically polished, and the aluminum alloy LY12 plate is subjected to pickling and passivating treatment; and the treated TA18 plate and the treated LY12 plate are subjected to explosive welding, the TA18 plate is arranged below while the LY12 plate is arranged above, the surface of the LY12 plate is coated with heat-resisting grease serving as a protective layer, an ammonium nitrate explosive mixture is adopted for explosive welding, and then the TA18 plate and the LY12 plate are subjected to softening annealing, cold rolling machining, heat treatment strengthening and multi-roller leveling treatment to obtain a titanium-aluminum composite; and a titanium-aluminum composite plate serves as a spinning billet to be installed on a particle reinforcer core film, and the particle reinforced titanium-aluminum composite based on spinning deformation is obtained through a hot spinning blooming forging method. The titanium-aluminum composite prepared through the preparation method is high in strength, low in weight and excellent in comprehensive performance.

The invention discloses a method for efficiently preparing blind rivet steel, and relates to the technical field of preparation of the blind rivet steel. The preparation method comprises the followingsteps of preparation of raw materials; primary drawing; heat treatment, wherein water bath quenching is adopted, the length of a quenching section is changed in the quenching process, staged heatingis adopted in the heat treatment process, steel wires form good oxide skin in the first two stages, and structural transformation is completed in the later four stages; secondary medium drawing, wherein the total drawing compression ratio is controlled within 70%, and the compression ratio of the last pass is controlled within 10%; powder removing, wherein residual soap powder of the drawn steel wires is removed through a powder removing box; and reeling. The method has the advantages that water bath quenching is adopted during heat treatment and is more environmentally friendly, staged heating is adopted during heat treatment, the quenching section length is changed, and the performance of the steel wires is well controlled; it is guaranteed that the surface quality of finished products reaches the standard, and the out-of-tolerance problem of the diameter is effectively reduced; and the content of residual soap powder on the surfaces of the steel wires is effectively reduced, and thepreparation efficiency is high.