505results about How to "Improve plastic toughness" patented technology

The invention relates to a high-strength and high-toughness weather-proof hot-rolled steel plate comprising the chemical components in percentage by weight: (wt,%): 0.05%-0.10% of C, 0.10%-0.50% of Si, 1.00%-1.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.30%-0.70% of Cr, 0.10%-0.40% of Ni, 0.25%-0.50% of Cu, 0.020%-0.050% of Al, 0.010%-0.040% of Nb, 0.010%-0.030% of Ti and the balance Fe and unavoidable impurity elements. Meanwhile, the traditional hot strip rolling process is adopted, and a preparation method specifically comprises the steps: deep desulphurization of molten iron until S is less than or equal to 0.0050%, converter top and bottom combined blowing, alloy fine adjustment, LF secondary refining, slab continuous casting, heating, two-rack rough rolling and seven-rack finish rolling, laminar cooling and reeling. The steel plate disclosed by the invention has the mechanical properties that ReL is 450-500MPa, the Rm is greater than or equal to 550MPa, A is 25.0%-30.0%, the -60 DEG C longitudinal Charpy V-shaped gap impact power is greater than 300J, the high-strength and high-toughness weather-proof hot-rolled steel plate has good matching of strength and toughness, good cold bending forming and welding properties and favorable atmosphere corrosion resistance, and the corrosion resistance of the high-strength and high-toughness weather-proof hot-rolled steel plate is twice as high as that of Q345B steel.

The invention belongs to the technical field of preparation of metal and alloy, and provides a preparation method for high-strength and high-toughness ultra-fine grain aluminium alloy. The preparation method comprises the steps that aluminium alloy is firstly cast to form a cast-state blank; then the cast-state blank is turned into an ECAP (Equal Channel Angular Pressing) blank, and then the ECAP blank is subjected to homogenization treatment and curing quenching treatment; and then the blank subjected to the curing quenching treatment is subjected to 1-8 passes of ECAP dynamic ageing treatment at temperatures ranging from the room temperature to 300 DEG C. According to the preparation method, through the ECAP dynamic ageing treatment at different temperatures, the grain size of the alloy is obviously refined; and the form and distribution of a nanometer ageing precipitated phase are more reasonable, so that the strength of the alloy is greatly improved, and meanwhile the alloy has excellent ductility and toughness.

The invention discloses a high-toughness weather-resistant steel plate with the yield strength of 550MPa and a preparation method of the high-toughness weather-resistant steel plate. The high-toughness weather-resistant steel plate is prepared from the following chemical components by weight percent: 0.05 to 0.10 percent of C, 0.10 to 0.40 percent of Si, 1.20 to 1.70 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.008 percent of S, 0.40 to 0.80 percent of Cr, 0.15 to 0.40 percent of Ni, 0.25 to 0.40 percent of Cu, 0.015 to 0.040 percent of Als, 0.030 to 0.070 percent of Nb, and 0.010 to 0.040 percent of Ti, and the balance of Fe and unavoidable impurities, wherein Pcm is equal to C+Si/30+(Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10+5B and less than or equal to 0.20 percent. The microscopic tissue of the weather-resistant steel plate obtained according to the method disclosed in the invention is composite-phase tissue of ferrite, granular bainite and little pearlite,the ReL is 560 to 650MPa, Rm is 680 to 780MPa, A is 22.0 to 26.0 percent, and the longitudinal Charpy V-type impact power KV2 is greater than 70J at the temperature of -40 DEG C, and the high-toughness weather-resistant steel plate has excellent welding performance, cold bending forming performance and atmospheric corrosion resistance.

The invention relates to drill collar steel and a preparation method thereof. The drill collar steel comprises the following components based on the total weight of drill collar steel: 0.41-0.47wt% of C, 0.15-0.3wt% of Si, 0.95-1.2wt% of Mn, 0.95-1.2wt% of Cr, 0.15-0.3wt% of Mo, 0.02-0.04wt% of Al, 0.01-0.03wt% of Ti, less than or equal to 0.02wt% of P, less than or equal to 0.015wt% of S, less than or equal to 0.2wt% of Ni, less than or equal to 0.2wt% of Cu, less than or equal to 0.05wt% of Sn, less than or equal to 0.0002 wt% of H, less than or equal to 0.007wt% of N and the balance of Fe;and T[O] is less than or equal to 0.0020wt%, and the A,B,C and D impurities are less than or equal to 1.5 levels. By using the preparation method, the problem that the strength of the drill collar steel is not matched with plastic toughness is solved.

The invention relates to nickel-free high-toughness 80kg-grade high-strength steel and a manufacturing method thereof. A component system of ultralow C, ultralow Si, medium Mn and Ti, V and B microalloy steel is used as a basis; the acid-soluble Als content in steel is properly improved, the Als is not less than 10*[(%Ntotal)-0.292(%Ti)], Mn/C is not less than 12, (%C)*(%Si) is not more than 0.01, and [(%Cr)+1.3(%Mo)]*[(%V)+(%C)] is not less than 0.087; Ca treatment is carried out, the Ca/S ratio is 1.00-3.00, and (%Ca)*(%S)<0.18> is not more than 2.5*10<-3>; F*DI index number * zeta is not less than 2.0* finished steel plate thickness, wherein zeta is on-line DQ (direct quenching) hardenability contribution factor, and F is B element hardenability contribution factor; DQ (thermo mechanical control process: TMCP) and off-line tempering process (T) are optimized; the microscopic structure of the steel plate is fine low-carbon tempered martensite and tempered lower bainite; the steel has the average colony size below 20 mu m, has excellent strength and plasticity and strong toughness, and is particularly suitable for hydroelectric pressure water pipes, steel branch pipes, scrolls, ocean platforms, large-sized engineering machines and other large-sized steel structures and equipment.

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 the composite technical field, in particular to a manufacturing method of metal matrix nanocomposites with high toughness. According to the manufacturing method, the size, distribution, interface structure of reinforcement bodies and the metal matrix micro-structure are effectively controlled by the combined composite process of twice ball-milling, discharging plasma in situ reaction sintering and the large strain plastic deformation technology, so that ultra-fine grain metal matrix composites with evenly distributed in situ authigenic nanoparticles and good interface combination are manufactured, and good matching of intensity and toughness is obtained.

The invention relates to high-nitrogen non-magnetic austenitic stainless steel. The high-nitrogen non-magnetic austenitic stainless steel comprises following chemical components including, by weight percent, 0.01% to 0.10% of C, not larger than 1.0% of Si, 17.0% to 24.0% of Mn, not larger than 0.035% of P, not larger than 0.015% of S, 1.0% to 4.0% of Ni, 17.0% to 24.0% of Cr, not larger than 1.0%of Mo, 0.50% to 0.80% of N and the balance Fe and inevitable impurities. The manufacturing method comprises the steps that the electric furnace+AOD+LF manner is adopted for smelting, continuous casting or die casting is adopted for making a slab ingot, and during continuous casting, the superheat degree is controlled to be smaller than 50 DEG C; a continuous casting blank or die casting slab ingotis put into a stepping type heating furnace to be heated, hot rolling on a rolling machine is carried out to form a board of the needed specification, the final rolling temperature ranges from 800 DEG to 950 DEG C, the hot-rolled board is subject to acid pickling, and the high-nitrogen non-magnetic austenitic stainless steel hot-rolled board finished product is obtained. The product has high yield strength, good ductility and toughness, corrosion resistance and wide application field and has no magnetism.

The invention provides a magnesium-lithium alloy with an enhanced long-period structure phase and a preparation method thereof. The method adopts pure Mg, pure Li, pure Zn and Mg-Y intermediate alloy as raw materials and comprises the following steps of: proportionally putting the raw materials into a vacuum induction melting furnace, filling a protective gas, heating and smelting, and casting the smelted melt into a metal die to obtain an as-cast alloy; performing heat treatment at 490-510 DEG C for 5-10 hours to obtain a casting alloy with an LPSO structure phase through phase transformation; and performing extrusion deformation processing at 260-280 DEG C to obtain a magnesium-lithium alloy which comprises the following components in percentage by mass: 5.5-10% of Li, 4-10% of Y, 1-4% of Zn, less than 0.03% of inevitable impurities Fe, Cu, Ni and Si in total and the balance of Mg, wherein the mass content ratio of Y to Zn is 1-6. According to the invention, by reasonably selecting the alloy elements, the LPSO structure phase is introduced into a magnesium-lithium alloy substrate, and a magnesium-lithium alloy material with low density, high strength, high plasticity and good heat resistance is prepared.

The invention discloses a production method of a 150-400mm thick steel plate for plastic moulds and belongs to the field of metal materials. Continuous cast slab is used as raw material to produce the 150-400mm thick steel plate by the production method and comprises, by weight percent, 0.20-0.40% of C, 0.20-0.50% of Si, 1.00-1.60% of Mn, not more than 0.008% of S and P, 0.10-0.50% of Mo, 1.40-2.0% of Cr, 0.01-0.04% of V, and not more than 0.20% of other alloy elements (Nb, Ti and Ni). The high thickness slab can be produced by full-vacuum electron beam welding or by combined process of gas shielded welding, submerged-arc welding and vacuum electron beam welding and is then subjected to heating, rolling, slow cooling and heat treatment procedures, ultrasonic testing qualified rate of the produced steel plate for plastic moulds reaches more than 98%, the hardness is even, and the steel plate has excellent machinability, wear resistance and polishability and is suitable for production of various plastic moulds.

The invention relates to a production method of a copper-steel composite plate. The production method comprises the following steps of: performing surface cleaning, performing texturing treatment, spraying a binding layer, rolling and annealing, wherein before rolling, alloy plating layers are respectively plated on the surfaces of a steel plate and a copper plate, which need to be compounded through an immersion plating or spray coating way, the thickness of each plating layer is 4-8 mu m, and each alloy plating layer contains the following components: 6-8 parts by weight of Zr, 25-50 parts by weight of Zn, 5-30 parts by weight of Al, 10-40 parts by weight of Fe, 0.5-1 part by weight of Si and 0.4-0.6 part by weight of Mo. The production method disclosed by the invention has the beneficial effects that as the bonding layers with the mixture ratio are adopted, the direct bonding property between the steel plate and the copper plate is good; in addition, the compounding temperature is lower, the rolling reduction is smaller and the working cost is saved; and the composite copper-steel material prepared by the method disclosed by the invention has the advantages of high strength, high plasticity and toughness and excellent stress and corrosion resistance.

The invention discloses ultrahigh-strength martensitic stainless steel and a preparation method thereof. The ultrahigh-strength martensitic stainless steel is high in yield strength, high in tensile strength, good in ductility and good in impact toughness. The preparation method comprises the steps as follows: Step 1, a raw material is prepared from stainless steel components in percentage by weight according to the burnt value, is smelted in the vacuum environment and is poured to form a steel ingot; the steel ingot is prepared from components in percentage by weight as follows: 0.10%-0.25% of C, 11.0%-17.0% of Cr, 0.5%-2.0% of Mn, 1.1%-3.0% of Si, 0.1%-4.0% of Ni, 0.1%-0.3% of Cu, less than or equal to 0.02% of P, less than or equal to 0.02% of S and the balance of Fe and inevitable impurity elements; Step 2, forging of the steel ingot is started at 1,050-1,200 DEG C, the finish forging temperature ranges from 880 DEG C to 920 DEG C, the forging ratio is larger than or equal to 5, and air cooling is performed after forging; Step 3, a forging is subjected to heat preservation at 950-1,050 DEG C for 2-4 h, is subjected to water quenching and then is tempered at 200-300 DEG C for 2-4 h, and the ultrahigh-strength martensitic stainless steel is obtained after natural cooling.

The invention discloses a brake pad material for a high-speed railway passenger train and a preparing method thereof and belongs to the technical field of powder metallurgy friction materials. The brake pad material is prepared by the following steps: after drying and sieving powdery raw materials, feeding the raw materials into a mixer, and spraying an adhesive; after mixing the materials, placing the materials in a steel mould, and carrying out pressing; and then, carrying out sintering at a reduction atmosphere, and then, carrying out heat treatment in a reduction atmosphere, wherein the powdery raw materials comprise copper powder, iron powder, Ti2AlC powder, chromium powder, nickel powder, manganese powder, silicon dioxide, graphite, boron nitride and molybdenum disulfate. The invention further provides the preparing method of the brake pad material. In the invention, in-situ TiC obtained through the Ti2AlC is used as a main friction component, the material of an in-situ nanometer TiC layered framework is prepared, the copper is accordingly used as a matrix, a small quantity of other metals is added, the content of lubricating components, such as the graphite, is regulated, and a novel material with a great brake effect and a low wear rate is finally obtained. The material is suitable for being used as the brake pad material for the high-speed railway passenger train.

The invention discloses a functional gradient aluminum-based composite material with a multilevel gradient structure. The functional gradient aluminum-based composite material comprises a wrought aluminum alloy layer and an aluminum-based composite material layer, wherein the aluminum-based composite material layer is used for separating out reinforced aluminum alloy as a matrix, and adopting boron carbide as an enhancement phase. The aluminum-based composite material layer is provided with a plurality of layers, the content of boron carbide in each layer of the aluminum-based composite material layer is different, the content gradient of the boron carbide is increased, and the content of each layer of the boron carbide is lower than 20% of the mass of the corresponding aluminum-based composite material layer. The invention further provides a preparation method of the functional gradient aluminum-based composite material with the multilevel gradient structure. According to the method,an electric field auxiliary sintering technology is adopted, and a voltage sintering method of direct current pulse current is utilized, so that the low-temperature rapid sintering can be realized, fine and uniform tissues can be obtained, the density of a sintered body is high, and the mechanical property is good.

The invention provides a steel plate with super-low cost, 800MPa-grade high toughness and excellent weldability and a manufacture method thereof. According to the manufacture method, metallurgical technical control methods of selecting super-low C-super-low Si-high Mn-highAls-(low Mo+high Cr) alloying-(Ti+Nb+V+B)microalloying composition system as basis, properly increasing the content of acid solution Als in steel, performing Ca treatment and leading the value of [(%C)+(%Mn)/6+(%Si)/24+(%Ni)/40+(%Cr)/5+(%Mo)/4+(%V)/14+7.3(%B)]*V cooling speed/(T starting cooling temperature-T terminating cooling temperature)*t to be more than or equal to 0.60 and less than or equal to 1.00, and the like are adopted, a specific controlled-rolling and online tempering process is optimized, the tempered steel plate has excellent weldability while the strength, low-temperature toughness, obdurability and plasticity of the tempered steel plate are matched, the problem of the weldability of a nickel-free tempered steel plate can be successfully solved, the welding HAZ has high strength, high toughness and excellent plasticity. The steel plate is especially suitable for hydroelectric pressure pipelines/volute casings/steel bifurcated pipes, marine platforms, large maritime working machinery and other large steel structures and equipment.

The invention relates to a heat treatment technology for preparing a high-performance low-residual stress aluminum alloy, and belongs to the technical field of aluminum alloy thermomechanical treatment. The method comprises the steps that 1, after an aluminum alloy sample is subjected to solution treatment and heat preservation, then is subjected to low-temperature quenching, and the transfer timedoes not exceed 10 seconds; 2, the sample obtained in the step 1 is subjected to cryogenic deformation to obtain a cryogenic deformation sample, the cryogenic deformation treatment temperature is lower than minus 120 DEG C, and the cryogenic deformation is equal or greater than 5%; 3, the cryogenic deformation sample obtained in the step 2 is put into a hot medium, the cryogenic deformation sample is vibrated by a vibration exciter, heat preservation and vibration maintaining are carried out, and the sample after the vibration reverse quenching treatment is obtained; and 4, the sample after the vibration reverse quenching treatment in the step 3 is subjected to aging treatment, and a finished product is obtained. The aluminum alloy prepared by the heat treatment technology has high comprehensive performance and low residual stress, and the stability of the material in service process is remarkably improved.

The invention discloses a high-strength wear-resisting heat-resisting aluminium alloy material and a preparation process thereof. The material comprises, by weight, 4.0-6.5% of copper, 0.06-0.4% of titanium, 0.08-0.6% of manganese, 0.03-0.4% of antimony, 0.4-0.6% of nickel, 1.2-1.8% of cobalt, 0.2-0.3% of zirconium, 0.2-1.8% of rare earth and the balance aluminum. During preparation of the material, a special heat treatment process is used. The material has the advantages of being capable of improving the mechanical strength, the abrasive resistance and the high-temperature deformation resistance of an aluminium alloy simultaneously, the material can be used for cast members which are required to bear a certain high temperature and have high mechanical performance requirements, and a new field of application of the aluminium alloy material is developed.

The invention discloses a mixed scale TiCN and TiB2 particle strengthened low alloy steel. The mixed scale TiCN and TiB2 particle strengthened low alloy steel is prepared from, by mass, 0.38-0.50% ofC, 0.50-0.80% of Mn, 0.17-0.37% of Si, 0.035% or less of P, 0.035% or less of S, 0.8-1.1% of Cr, 0.25% or less of Ni, 0.25% or less of Cu, 0.018-0.28% of Al, 0.009-0.16% of TiCN and TiB2 and the balance Fe. The invention provides a preparation method of the mixed scale TiCN and TiB2 particle strengthened low alloy steel. Mixed scale TiCN and TiB2 particle intermediate alloy is added in low alloy steel melt, the percentage composition of components in the alloy steel is optimized, the mixed scale TiCN and TiB2 particle strengthened low alloy steel is obtained, and plasticity and toughness of the low alloy steel is improved on the premise that the strength of the low alloy steel is ensured by means of the synergistic effect of multi-phase mixed scale particles.

The invention discloses a martensite wear-resistant steel plate with high wear resistance, belonging to the technical field of steel manufacturing. According to a technical scheme in the invention, the martensite wear-resistant steel plate comprises the following chemical components by weight: 0.32 to 0.38 % of C, 0.02 to 0.30% of Si, 0.8 to 1.0% of Mn, 0.6 to 0.8% of Ti, 0.02 to 0.03% of Nb, 0.15-0.20% of Mo, 0.35-0.45% of Cr, 0.0010-0.0020% of B, no more than 0.003% of S and no more than 0.012% of P, with the balance being Fe and unavoidable impurity elements. In the process of hot continuous rolling in the invention, TiC particles precipitated through continuous casting are gradually fragmented and homogenized along a rolling direction; through rolling fragmentation and solid-state precipitation of nano-sized TiC, most of the micron-sized TiC particles precipitated through continuous casting disappear; and nano-sized TiC can refine original austenite grains and improve ductility andtoughness.

The invention relates to the technical field of fire-resistant weather-proof steel plates for building structures, in particular to a fire-resistant weather-proof steel plate for 690MPa-grade buildingstructure and a manufacturing method thereof. The steel plate consists of the following chemical components in percentage by weight: 0.05%-0.10% of C, 0.10%-0.40% of Si, 1.20%-1.80% of Mn, less thanor equal to 0.010% of P, less than or equal to 0.003% of S, 0.7%-1.1% of Ni, 0.65%-1.10% of Cu, 0.20%-0.60% of Mo, 0.07%-0.12% of Nb, 0.05%-0.075% of V, 0.02%-0.035% of Ti, less than or equal to 0.0025% of B, 0.01%-0.04% of Al, and the balance of iron and inevitable impurities. The fire-resistant weather-proof steel plate adopts a two-phase region once thermal treatment process to obtain a reversetransformed austenite structure which is proper in proportion and stable, so that a multi-phase structure which consists of tempered-state martensite, a nano precipitated phase and retained austeniteis finally obtained. A smelting and continuous-casting process scheme realizes low-phosphor low-carbon control. The product has high strength and toughness, high plasticity, a low yield ratio, and excellent fire resistance, weather resistance and lamellar tearing resistance.