41 results about "Maraging steel" patented technology

The application discloses a kind of martensitic age steel of additive manufacturing and preparation method thereof, the martensitic age steel, according to mass percentage, its composition is as follows: Ni 16~22%, Co0-5%, Mo 2~6%, Ti 0.2~2.5%, Al 0~1.5%, Re 0~0.3%, wherein Re is selected from at least one of Y or La, the balance is Fe and inevitable impurities.In the application, by reducing Co element, adjusting the ratio of Ni, Ti and Mo in the alloy, while adding a small amount of rare earth (Y and La) element, the alloy has higher M s Under the premise, the raw material cost of alloy powder and the preparation cost of alloy are greatly reduced, and the fine equiaxed grains and high-density nano precipitates formed after aging are formed by combining with the process parameter control of additive manufacturing, so that the mechanical properties of the martensitic age steel are greatly better than those of the traditional casting process.

The invention discloses an ultrahigh-strength maraging steel wire as well as a preparation method and application thereof, and belongs to the field of steel product manufacturing. The steel wire alloy comprises the following components in percentage by weight: 0.02%-0.05% of C, 0.10%-0.35% of Si, 0.20%-0.60% of Mn, 0.60%-2.50% of Cr, 18.5%-22.0% of Ni, 8.0%-13.0% of Co, 1.2%-2.0% of Ti, 3.0%-5.5% of Mo, 0.10%-0.50% of Al, less than or equal to 1.50% of Cu, less than or equal to 1.50% of Nb, less than or equal to 0.05% of V, less than or equal to 0.04% of N, less than or equal to 0.02% of La + Ce and the balance of Fe and inevitable impurity elements. And the equivalence ratio Nieq / Creq of nickel to chromium is greater than or equal to 1.80. The steel wire provided by the invention has ultrahigh strength, excellent toughness and plasticity, wear resistance, heat resistance, drawing performance and bending and twisting performance.

The invention relates to the technical field of metallurgical engineering, in particular to a recycling method of high-cobalt-molybdenum metallurgical iron waste and martensite ultrahigh-strength steel. The low-carbon low-phosphorus ultra-pure Co-Fe alloy with different Co contents is produced through the recycling method of the high-cobalt molybdenum metallurgical iron waste, the Co-Fe alloy can be used for producing high-cobalt high-added-value martensite ultra-high-strength steel such as NiMark250, NiMark300 and 18Ni which are higher in value, and the production cost of the high-added-value martensite ultra-high-strength steel is reduced while recycling of Co resources is achieved. According to the method, pyrometallurgy is combined with the purity requirement of the high-cobalt-nickel maraging steel, the high-cobalt metallurgical waste is recycled, waste resources are recycled, and the subsequent production cost of the high-cobalt maraging steel is also reduced; the problems that in the prior art, high-cobalt-molybdenum metallurgical iron waste is difficult to recycle, and the production cost of high-cobalt-molybdenum maraging steel is high are solved.

The invention relates to the technical field of metallurgical engineering, in particular to a production method of nickel-iron alloy for metallurgy. The method comprises the following steps that the high-nickel-titanium metallurgical waste is divided into a plurality of categories according to the nickel content and the titanium content; and the multiple types of waste materials are subjected to smelting and post-treatment correspondingly, and finished nickel-iron alloy products with different nickel contents are obtained. According to the method, high-valued recovery of nickel and titanium resources in the waste is achieved through fine classification, multi-stage refining control and vacuum purification of the waste, the produced high-purity nickel-iron alloy can be directly used for smelting high-end maraging steel, degradation use is effectively avoided, the raw material cost is remarkably reduced, and the resource utilization rate is increased.

Provided is a maraging steel powder with which it is possible to obtain a laminated molded article having excellent thermal fatigue life characteristics and little deformation after molding while minimizing Co content. A maraging steel powder for laminate molding, which contains, in mass%, 0.02% or less of C, 0.1%-0.3% of Si, 16%-20% of Ni, 0.1% or less of Co, 2.7%-3.5% of Mo, 1.5%-2.5% of Ti, 0.01% or less of Al, and the balance of Fe and unavoidable impurities, and a laminate molded article of maraging steel, which contains, in mass%, 0.02% or less of C, 0.1%-0.3% of Si, 16%-20% of Ni, 0.1% or less of Co, 2.7%-3.5% of Mo, 1.5%-2.5% of Ti, 0.01% or less of Al, and the balance of Fe and unavoidable impurities. The steel sheet comprises 0.02% or less of C, 0.1%-0.3% of Si, 16%-20% of Ni, 0.1% or less of Co, 2.7%-3.5% of Mo, 1.5%-2.5% of Ti, 0.01% or less of Al, and the balance Fe and unavoidable impurities.

The invention relates to an explosive welding preparation method of a high-strength steel / high-toughness steel layered composite material, and belongs to the technical field of metal layered composite materials. The maraging steel and the austenitic stainless steel which are subjected to solution treatment are subjected to explosive welding and aging treatment to obtain the composite material with matched strength and toughness. The maraging steel obtains a supersaturated low-carbon lath martensite structure through solution treatment, the hardness is low and the plasticity is good in the state, and a good bonding interface can be formed during explosive welding; aging treatment is integrally carried out after welding, so that nanoscale intermetallic compounds are separated out from martensite phases, the strength and toughness of a welded plate are remarkably improved, meanwhile, embrittlement of a welding heat affected zone is avoided, and overall toughness synergy of the composite material is achieved.

The invention relates to a direct energy deposition additive manufacturing method for super-strong maraging steel, and belongs to the technical field of additive manufacturing. In the method, in order to obtain the excellent performance of the super-strong maraging steel, the super-strong maraging steel is subjected to heat treatment, formed super-strong maraging steel is obtained by optimizing 3D printing process parameters, and a formed sample is subjected to solution treatment, subzero treatment and aging treatment to obtain a super-strong maraging steel finished product. The influence of heat treatment on the structure and performance of the 3D printing super maraging steel is verified through phase analysis, microstructure observation, tensile test, impact test and contrastive analysis.

A kind of granular enhanced martensitic age steel cored filling wire for double-wire electric arc additive manufacturing and method, it relates to the field of additive manufacturing.Cored filling wire 1: manganese powder 0.5%-1%, cobalt powder 34%-36%, titanium powder 4%-5%, aluminum powder 1%-2%, molybdenum powder 47%-48%, the balance is iron powder;The outer skin is selected with low-carbon steel strip, and the carbon content is less than 0.03%;Cored filling wire 2: cobalt powder 18%-19%, ceramic particles 0.5%-2%, the balance is iron powder;The outer skin is made of iron-nickel alloy steel strip, and the mass ratio of Fe and Ni is 1:1;The filling rate is 20%-30%.The current control range is 160A-200A.The wire feeding speed is 150mm / min-160mm / min.Martensitic age steel component with good corrosion resistance and high strength can be obtained.

This invention relates to the field of steel materials technology, and discloses a high-strength and high-toughness synergistically optimized martensitic aging steel and its preparation method. The martensitic aging steel comprises, by mass percentage: Co: 15.5~17.0%, Ni: 17.0~19.0%, Mo: 6.0~8.0%, Ti: 1.0~2.0%, Al: 0.5~1.0%, Mn: 0.1~0.5%, Zr: 0.01~0.05%, with the balance being Fe and unavoidable impurities. This invention can synergistically improve the strength and toughness of martensitic aging steel while reducing the difficulty of its preparation.

Embodiments of this application provide a maraging steel, a method for preparing a maraging steel, and an electronic device. The maraging steel includes the following alloy elements: Co, Mo, and Ti. By weight percentage, content of Co ranges from 12 wt% to 17 wt%, content of Mo ranges from 6 wt% to 8 wt%, and content of Ti ranges from 0.4 wt% to 1.5 wt%. The maraging steel further includes the following alloy elements: Ni, Al, Fe, and an impurity element. By weight percentage, content of Ni ranges from 15 wt% to 18 wt%, Al≤0.3 wt%, and the remainder is Fe and the impurity element. Embodiments of this application provide the maraging steel, the method for preparing a maraging steel, and the electronic device, so that the maraging steel can have both a high strength and high plasticity.

The invention relates to the field of welding materials, in particular to a stainless steel flux-cored wire for a high-temperature welding environment and a preparation method of the stainless steel flux-cored wire, which are used for solving the problem that the corrosion resistance of a common welding material is obviously influenced in the high-temperature welding environment. The stainless steel flux-cored wire comprises powder and a welding skin, the powder is obtained by mixing cobalt-grafted carbon alloy composite powder, molybdenum powder, ferrochrome powder, manganese powder and the like, the high-temperature stability of the flux-cored wire is improved through the cobalt-grafted carbon composite carbon material, and the high-temperature stability is jointly improved through addition of ferroboron powder, vanadium nitride powder and niobium-zirconium alloy powder; the welding skin is prepared by mixing 18Ni300 maraging steel powder and 0Cr18Ni9 austenite steel powder, so that the heat resistance and the corrosion resistance of the welding wire are improved; when the welding wire is used for welding, the welding wire is decomposed at a high temperature, released gas forms a protective layer, meanwhile, molten powder is mixed with a welding skin to form a high-quality welding seam, and it is ensured that the stable and reliable welding effect can also be obtained in a high-temperature environment.

To provide a metal powder material for additive manufacturing, capable of generating an additive manufactured object having properties of a steel material before aging treatment of maraging steel, such as high strength and toughness and excellent moldability at the time of manufacturing by a powder bed fusion method, having appropriate hardness, having high dimensional accuracy with residual stress being released, and having properties of maraging steel by an aging treatment carried out as necessary, and to provide a method for manufacturing an additive manufactured object.SOLUTION: According to the present invention, a metal powder material for additive manufacturing is provided which comprises C (carbon): more than 0.03 mass% and 0.4 mass% or less, Si (silicon): 0.1 mass% or more and 0.5 mass% or less, Mn (manganese): 0.2 mass% or less, Co (cobalt): 0.1 mass% or less, Ni (nickel): 17 mass% or more and 19 mass% or less, Mo (molybdenum): 1.5 mass% or more and 2.5 mass% or less, Ti (titanium): 0.5 mass% or more and 2.0 mass% or less, and Al (aluminum): 0.8 mass% or more and 1.1 mass% or less, with the balance consisting of Fe (iron) and inevitable impurities.SELECTED DRAWING: Figure 4

To provide maraging steel exhibiting high thermal conductivity while being substantially free of cobalt, and to provide powder composed of the maraging steel.SOLUTION: The maraging steel contains 9.0≤Ni≤12.0 mass%, 4.0≤Mo≤7.0 mass%, and 0.3≤Al+Ti≤1.4 mass%, with the remainder consisting of Fe and unavoidable impurities. The maraging steel preferably further contains at least one element selected from the group consisting of 0.05≤Nb≤0.3 mass%, 0.1≤V≤1.0 mass%, and 0.5≤W≤5.0 mass%. The powder is produced from the maraging steel.SELECTED DRAWING: Figure 2

The application discloses a functional gradient material and a preparation method and application thereof. The functional gradient material comprises, in sequence, a martensitic stainless steel base material layer, a transition layer, a nickel-based alloy layer, a composite gradient layer and a maraging steel layer. The transition layer is made of nickel-based alloy and austenitic stainless steel; the composite gradient layer is made of nickel-based alloy and maraging steel; and the microhardness of the martensitic stainless steel base material layer, the transition layer and the nickel-based alloy layer satisfies the following relationship: martensitic stainless steel base material layer < transition layer < nickel-based alloy layer; in the composite gradient layer, at least two sublayers with different compositions are included; and from the nickel-based alloy layer to the maraging steel layer, the mass percentage of nickel-based alloy in each layer decreases by 20-40 wt% in turn. The functional gradient material effectively solves the problem of interface hardness mutation during deposition of the maraging steel, and makes the material have excellent yield strength, elongation and wear resistance.

The present application relates to the field of aviation equipment maintenance, and particularly relates to an aircraft refueling control valve nut inner thread repairing device and a manufacturing method thereof, which comprises a base plate, further comprises a positioning gyroscope connected with a piston and a screw tap tenon, a cylindrical gyroscope handle with the same shape as the through hole of the piston is arranged on the positioning gyroscope, and a gyroscope disc with the same shape as the groove of the piston is arranged on the positioning gyroscope, the shape of the positioning gyroscope is gyroscope, and the specific steps are as follows: S1, size design; S2, positioning gyroscope model creation; S3, model data processing; S4, 18Ni300 die steel powder preparation; S5, positioning gyroscope rapid preparation; S6, aircraft refueling control valve nut inner thread repairing device assembly; the positioning gyroscope with the size of the piston accessory and the screw tap accessory is designed to be gap fit with both, 18Ni300 maraging steel material is selected, laser selection melting forming technology is adopted for rapid manufacturing, and finally the aircraft refueling control valve nut inner thread repairing device with variable range of clamping angle is obtained.

A method of making a tool having a joining a maraging steel joining partner and a cemented carbide joining partner by brazing and a tool made according to the method is provided. The method includes depositing a Ni coating onto the maraging steel joining partner prior to applying the filler material having at least 70 wt % Cu. The braze joint shows excellent shear strength.

The present invention relates to a rotary cutting tool insert comprising a carrier body made of maraging steel and at least one cutting element having at least one cutting edge, the rotary cutting tool insert further comprising a braze joint joining the carrier body and the at least one cutting element, the braze joint comprising Ti, and a Ti-containing bonding layer having a thickness of 0.03 to 5 μm adjacent to the cutting element.

The invention relates to the technical field of powder metallurgy materials and intelligent manufacturing, in particular to high-strength corrosion-resistant maraging steel powder for injection molding and high-strength corrosion-resistant maraging steel prepared from the high-strength corrosion-resistant maraging steel powder. The high-strength corrosion-resistant maraging steel powder for injection molding is prepared from the following chemical elements in percentage by mass: 17 to 19 weight percent of Ni, 12 to 13 weight percent of Cr, 5 to 5.5 weight percent of Mo, 1.4 to 1.6 weight percent of Ti, 0.3 to 0.5 weight percent of Al, 0.05 to 0.1 weight percent of N, 0.15 to 0.30 weight percent of O, less than or equal to 0.02 weight percent of C, and the balance of Fe and inevitable impurity elements. The prepared high-strength corrosion-resistant maraging steel meets the extreme requirements of high strength (larger than or equal to 1800 MPa), high plasticity (the ductility ranges from 4.0% to 5.4%) and high salt spray corrosion resistance (larger than or equal to 4 hours).

The invention relates to high-thermal-conductivity die-casting die additive manufacturing metal powder and a preparation method. The high-thermal-conductivity metal powder for additive manufacturing of the die-casting die comprises the following chemical components in percentage by mass: 0.25-0.35% of C, 1t of Si, 1t of P, 1t of S, 1t of P, 1t of S, 1t of P, 1t of S and the balance of Fe and inevitable impurities. 0.1%, Mn: lt; 0.20%, Ni: lt; 3.00%, Cr: lt; 2.00%, W: 1.80-2.50%, and V: lt; the steel comprises the following components in percentage by weight: 0.1% of Fe, 2.50-3.80% of Mo, less than or equal to 0.02% of S, less than or equal to 0.025% of P, less than or equal to 0.025% of O and the balance of Fe and inevitable impurities. The metal powder has the beneficial effects that the obtained metal powder is suitable for 3D printing and is suitable for direct manufacturing of a high-load die-casting die conformal waterway insert, the application bottlenecks of existing H13 steel and 18Ni300 maraging steel in the aspects of formability, heat-conducting property and cost are solved, the forming qualification rate and heat-conducting property of an additive manufacturing inlay die are remarkably increased, the service life of the additive manufacturing inlay die is remarkably prolonged, and the metal powder is suitable for 3D printing and direct manufacturing of the high-load die-casting die conformal waterway insert. And the safety and efficient heat management requirements of the integrated die-casting die on the conformal waterway are met.

Embodiments of this application provide a maraging steel, a method for preparing a maraging steel, and an electronic device. The maraging steel includes the following alloy elements: Co, Mo, and Ti. By weight percentage, a content of Co ranges from 12 wt % to 17 wt %, a content of Mo ranges from 6 wt % to 8 wt %, and a content of Ti ranges from 0.4 wt % to 1.5 wt %. The maraging steel further includes the following alloy elements: Ni, Al, Fe, and an impurity element. By weight percentage, a content of Ni ranges from 15 wt % to 18 wt %, Al≤0.3 wt %, and the remainder is Fe and the impurity element. Embodiments of this application provide the maraging steel, the method for preparing a maraging steel, and the electronic device, so that the maraging steel can have both a high strength and high plasticity.

Provided are a maraging steel having an excellent aging behavior and a method for manufacturing the maraging steel. The maraging steel has a chemical composition containing, by mass %, C: 0.02% or less, Si: 0.1% or less, Mn: 0.1% or less, P: 0.01% or less, S: 0.01% or less, N: 0.01% or less, Ni: 12% to 25%, Co: 5% to 12%, Mo: 2% to 7%, Ti: 0.5% to 1.5%, Al: 0.01% to 0.1%, and the balance being iron and incidental impurities, the steel having a steel microstructure containing, in terms of area fraction, 90% or more of a strain-induced martensite phase.

The present application belongs to the field of metallic structural materials, and particularly relates to an oxide dispersion strengthened maraging steel and a preparation method thereof. The alloying components of the steel are as follows in terms of percentage by weight: Ni: 18.0-21.0%, Mo: 2.5-3.5%, Ti: 1.0-1.8%, 0.05≤Y2O3≤0.5, C≤0.01%, Si≤0.10%, Mn≤0.10%, S≤0.008%, P≤0.008%, and Fe in the rest. Y2O3 is uniformly distributed in the matrix in the form of supersaturated solid solution or amorphous state by mechanical alloying; firstly, a number density of 10 21 ~10 23 / m 3 of nanometer oxides is precipitated in the process of thermal solidification forming; then a large number of nanometer Ni3Ti is precipitated again after solid solution and aging treatment; finally, a high-density composite strengthening phase of nanometer oxides and Ni3Ti is formed, and the average grain size is ≤300 nm, so that a maraging steel with super-high strength and good high-temperature thermal stability is obtained.

The invention discloses a direct energy deposition additive manufacturing method for corrosion-resistant maraging steel based on different laser intensities, which is characterized by comprising the following steps of: forming metal powder by adopting BK1900 matched with a plasma rotating electrode technology (PREP) powder manufacturing process, then adopting a direct energy deposition forming process method, respectively setting the laser power as 3000W, 3500W, 4000W, 5000W and 6000W, setting the scanning speed as 600mm / min, and carrying out direct energy deposition forming on the surface of the metal powder to obtain the corrosion-resistant maraging steel. The method comprises the following steps of: forming under the condition of controlling other process parameters to be unchanged, and carrying out full immersion corrosion and chemical corrosion experimental analysis on a formed part, so that the BK1900 steel grade adopts a PREP powder preparation process, the laser power is 3500W, and under the condition of not adjusting other process parameters, the BK1900 steel grade has the characteristics of high yield, high quality and the like, and the quality of the BK1900 steel grade is ensured to be higher than that of the BK1900 steel grade by using the PREP powder preparation process and the laser power is 3500W. And a formed part with the best corrosion resistance can be obtained in the additive manufacturing process.

The present invention relates to a cutting tool insert including a carrier body made of maraging steel. The carrier body has at least one rake face, at least one flank face and at least one pocket, wherein the at least one cutting element is situated in the at least one pocket. The cutting element has at least one cutting edge and can be made of any material known in the art of cutting. The cutting tool insert further includes a braze joint joining the carrier body and the at least one cutting element, wherein the braze joint includes Ti and a Ti containing joining layer with a thickness of between 0.03 and 5 μm adjoining to the cutting element.

The invention relates to a manufacturing process of ultrahigh-strength maraging steel formed by metal powder injection, and the maraging steel comprises the following raw materials in percentage by mass: 15-20% of Ni, 10-15% of Co, 4.0-6.0% of Mo, 0.5-2.5% of Ti, 0.05-0.3% of Al, less than or equal to 0.05% of C, less than or equal to 0.5% of Mn and the balance of Fe and inevitable impurity elements. Comprising the following steps: S1, feed preparation; s2, forming; s3, degreasing is conducted; s4, sintering; and S5, heat treatment. The density gt of a metal tensile sample piece finished product is prepared through the process; the Rockwell hardness gt is 8.05 g / cm < 3 >; the HRC is 54.5 HRC, and the tensile strength is gt; the pressure is 2300 MPa, and the yield strength is gt; and the ductility is 6-8% under the pressure of 2200 MPa.

The application relates to the field of powder metallurgy materials and intelligent manufacturing technology, in particular to a high-strength corrosion-resistant maraging steel powder for injection molding and a high-strength corrosion-resistant maraging steel prepared by using the same. The mass percentage content of each chemical element of the high-strength corrosion-resistant maraging steel powder for injection molding is as follows: 17-19wt% of Ni, 12-13wt% of Cr, 5-5.5wt% of Mo, 1.4-1.6wt% of Ti, 0.3-0.5wt% of Al, 0.05-0.1wt% of N, 0.15-0.30wt% of O, C: <=0.02, the balance of Fe, and inevitable impurity elements. The high-strength corrosion-resistant maraging steel prepared by the application meets the extreme requirements of high strength (>=1800MPa), high plasticity (elongation 4.0-5.4%) and high salt mist corrosion resistance (>=4 hours).

This invention relates to the field of martensitic aging steel production technology, specifically disclosing a martensitic aging steel wire with a pressure of 2.3 GPa or higher and its preparation method. The preparation method includes: forming a steel ingot into a coil with a diameter of 8-10 mm; subjecting the coil to solution treatment, cooling it to room temperature, and then performing surface processing to obtain a first intermediate wire; subjecting the first intermediate wire to multiple drawing cycles to obtain a wire with a diameter of 1-2 mm; wherein the drawing cycle treatment includes: cold drawing followed by online solution heat treatment. This invention produces martensitic aging steel wire products with a diameter of Φ1.0~2.0mm and a Pa value of 2.3GPa or higher by gradient adjustment of the drawing diameter reduction of wire rod and wire and intermediate solution annealing treatment, thereby controlling the grain size of the wire to 3~6µm. The yield strength Rp0.2>2.3GPa, tensile strength Rm>2.4GPa, and elongation A≥5% of the wire after aging treatment are achieved. Furthermore, the preparation method is designed based on the equipment conditions of metal wire manufacturing manufacturers, making it easy to operate, highly efficient, and with high product quality stability.

The application belongs to the field of metal structural materials, and particularly relates to a bimodal heterogeneous structure maraging steel and a preparation method thereof. The alloy components of the bimodal heterogeneous structure maraging steel are as follows in percentage by weight: Ni: 18.0-21.0%, Mo: 2.5-3.5%, Ti: 1.0-1.8%, 0.01<=Y<=0.2, C<=0.01%, Si<=0.10%, Mn<=0.10%, S<=0.008%, P<=0.008%, and Fe balance. The preparation method has a process route of: atomization spraying-powdering, low-energy ball milling, packaging and air extraction, hot isostatic pressing solidification molding, forging and rolling, solid solution + aging heat treatment. Pure Y powder is added in the low-energy ball milling process, and by controlling the rotation speed and ball milling time, the powder particles form a bimodal grain size core-shell structure with fine crystals on the surface and coarse crystals in the center. The oxide formed by the Y element pins the grain boundary, and the stability of the grain boundary is ensured, so that the bimodal grain size structure characteristics can be guaranteed even after the later hot isostatic pressing solidification molding, heat treatment and heat treatment.

Provided are a maraging steel having an excellent aging behavior and a method for manufacturing the maraging steel. A maraging steel, the steel having a chemical composition containing, by mass%, C: 0.02% or less, Si: 0.1% or less, Mn: 0.1% or less, P: 0.01% or less, S: 0.01% or less, N: 0.01% or less, Ni: 12% to 25%, Co: 5% to 12%, Mo: 2% to 7%, Ti: 0.5% to 1.5%, Al: 0.01% to 0.1%, and the balance being iron and incidental impurities, the steel having a steel microstructure containing, in terms of area fraction, 90% or more of a strain-induced martensite phase.

The invention discloses additive manufacturing Fe-Mn-Ni based maraging steel and a preparation method of the additive manufacturing Fe-Mn-Ni based maraging steel. The aging steel comprises the following chemical components in percentage by mass: 8%-12% of Mn, 3%-7% of Ni, 1%-3% of Al, 0.5%-1.5% of Mo, 0.25%-1.25% of Ti and the balance of Fe and inevitable impurities. According to the invention, Ni is partially replaced by Mn, so that a martensite matrix is ensured, and meanwhile, stable austenite is introduced to realize the obdurability balance of the material; meanwhile, by means of the synergistic effect of Al, Mo and Ti elements, a high-density nanoscale precipitated phase is formed in the aging process to guarantee the strength of the material. According to the alloy, Co-free maraging steel is achieved, and the raw material cost is greatly reduced. After optimization, the tensile strength of the material is not lower than 1250 MPa, the percentage elongation after fracture is not lower than 20%, and excellent balance of strength and plasticity is achieved.