259 results about "Formability" patented technology

The invention discloses a 340MPa grade P-containing hot-dip galvanized iron alloy high-strength IF steel, the chemical composition of which is as follows by weight: C: ≤0.003%, Si: ≤0.03%, Mn: 0.35-0.65%, P: 0.03-0.075%, S≤0.010%, Als: 0.020-0.045%, Nb: 0.008-0.015%, Ti: 0.02-0.03%, B: 0.0004-0.0010%, N≤0.0035%, and the remainder is Fe and unavoidable impurities; The elements also meet the following restrictions: calculated according to the corresponding weight percentage of each element, 10C+3N+2S≤Ti+2Nb≤12C+3N+2S, 60B≤P≤80B; the present invention adds P element to IF steel, and through composition and process optimization control, obtains a P-containing hot-dip galvanized iron alloy high-strength IF steel with a yield strength of 180-320 MPa, a tensile strength of 340-440 MPa, an elongation of 35-46%, a value (average plastic strain ratio) ≥1.8, high surface quality, high formability, and good cold brittleness.

The invention belongs to the field of metal materials, and provides 800MPa-grade alloyed galvanized complex phase steel with ultrahigh reaming performance for automobiles and a preparation method of the 800MPa-grade alloyed galvanized complex phase steel, and the steel plate comprises the following components in percentage by weight: 0.12%-0.17% of C, 1.90%-2.25% of Mn, 0.30%-0.65% of Si, 0.020%-0.040% of Ti, less than or equal to 0.030% of P, less than or equal to 0.002% of N, less than or equal to 0.005% of S and the balance of Fe and inevitable impurities. The preparation method comprises the steps of smelting, hot rolling, acid pickling, cold rolling, continuous annealing galvanizing and finishing. The microstructure of the steel plate produced by the method is mainly composed of bainite and tempered martensite, and the steel plate has ultrahigh hole expansion rate and excellent forming performance.

A kind of titanium alloy plate local heat / electricity / ultrasonic multi-field coupling assisted progressive forming device and its use method, relate to a kind of titanium alloy plate progressive forming device and its use method.The present application is to solve the technical problems of the existing titanium alloy plate progressive forming method relatively slow heating speed, high energy consumption, poor product quality.The device of the present application realizes two-stage heating by local non-contact heating and pulse current self-resistance heating, improves the heating rate, improves the material plasticity by the "electroplasticity" effect generated by pulse current, reduces the material deformation resistance by the "ultrasonic softening" effect generated by ultrasonic field, improves the formability, and improves the forming quality by multi-field coupling.The present application realizes the reduction of material deformation resistance and plasticity by the coupling of heat, electricity and ultrasonic multi-energy field in the deformation process of sheet metal, and significantly improves the formability of material.

The invention belongs to the technical field of material forming and manufacturing, and discloses a hot gas expansion-explosion composite forming method for forming a complex deep-cavity thin-wall component. According to the hot air expansion-explosion composite forming method, a mold unit, an air pressure loading unit and an explosion unit are needed; the method comprises the following steps: mold preheating; feeding and die assembly are carried out; compressed air is filled, and pre-expansion is carried out; fuel is sprayed, and explosion forming is conducted; releasing pressure; and opening the mold and taking the part. The method has the advantages that hot gas bulging forming utilizes metal high-temperature plasticity and evenly-distributed flexible air pressure loading, and the plate forming performance is improved; explosive forming has a very high deformation rate, high plastic deformation can be achieved within a very short time, and the forming performance of the plate can be further improved through the combined action of the strain rate effect and the inertia force. According to the method, the plastic deformation capacity of the material can be remarkably improved by combining the two, and forming of the complex deep-cavity thin-wall component is facilitated.

The invention discloses a 420MPa-grade steel strip for a high-corrosion-resistance photovoltaic support based on Ti microalloying and low-aluminum high-magnesium coating synergistic reinforcement and a preparation method of the 420MPa-grade steel strip, and relates to the technical field of metal materials. Aiming at the requirements of a distributed photovoltaic bracket, a microalloy component taking a Ti element as a core is designed, and the microalloy component is matched with a low-aluminum high-magnesium micro-titanium coating system to prepare the 420MPa-grade steel belt for the high-corrosion-resistance photovoltaic bracket, which is based on Ti microalloying and low-aluminum high-magnesium coating synergistic reinforcement and has balanced performance and good corrosion resistance. And meanwhile, controlled rolling and controlled cooling and low-temperature annealing are adopted in the preparation process, so that the problem of poor formability of traditional steel is solved, energy consumption is reduced by utilizing a low-temperature rapid plating process, and the production efficiency is improved. While the alloy cost is reduced, balanced optimization of strength-corrosion resistance-forming-welding performance is achieved, and low cost and greenization of a photovoltaic support material are promoted.

The application discloses a high-strength steel part hot stamping forming method, and solves the problem of considering strength and plasticity of a steel plate part. The hot stamping forming method comprises the following steps: heating a plate to complete austenitization and rapid precooling; secondary heating and holding: the pre-cooled plate is heated and held again, the temperature is 500-800 DEG C, and the time is 30-180 s, so that the plate enters a diffusion phase change zone, part of the austenite is converted into ferrite or bainite (soft phase), at this time, the plate has good formability and small deformation resistance; the plate is rapidly transported to a die and formed and quenched, at this time, the remaining austenite is converted into martensite (hard phase), the strength of the part is increased; finally, the die is opened, and the part is taken out. The application adjusts and controls the temperature and time in the hot forming process, can meet the double indexes of the strength and plasticity of the part, controls the component proportion of the soft phase and the hard phase, and can realize the accurate control of the strength and elongation of the final part.

The present invention provides a high-strength steel sheet having a tensile strength of 1180 MPa or higher, and excellent formability, impact resistance, and axial crushing properties. Therefore, the composition, in mass%, includes C: 0.15-0.30%, Si: 0.10-1.50%, Mn: 1.50-4.00%, P: 0.020% or less, S: 0.0020% or less, sol.Al: 0.100% or less, and N: 0.0150% or less. The total content of ferrite and bainite is 10% or less, tempered martensite is 80% or more, retained austenite is 10.0% or less, and fresh martensite is 10% or less. The C concentration in retained austenite is 0.50% by mass or less, and the Fe carbide content is 0.10-0.30% by mass.

A method for producing a steel sheet, the method containing the following successive steps:providing a cold-rolled steel sheet, the chemical composition of the steel containing in weight %: 0.15%≤C≤0.23%, 2.0%≤Mn≤2.8%, 1.0%≤Si≤2.1%, 0.02%≤Al≤1.0%, with 1.7%≤Si+Al≤2.1%, 0≤Nb≤0.035%, 0≤Mo≤0.3%, 0≤Cr≤0.4%, the remainder being Fe and unavoidable impurities,annealing the steel sheet at an annealing temperature TA so as to obtain a structure comprising at least 65% of austenite and up to 35% of intercritical ferrite,quenching the sheet at a cooling rate of at least 20° C. / s from a temperature of at least 600° C. down to a quenching temperature QT comprised between Ms−170° C. and Ms−80° C.,heating the sheet up to a partitioning temperature PT between 350° C. and 450° C. and maintaining the sheet at this temperature for a partitioning time Pt comprised between 80 s and 440 s,immediately cooling the sheet down to the room temperature,the steel sheet having a final microstructure consisting of, in surface fraction:between 40% and 70% of tempered martensite,between 7% and 15% of retained austenite,between 15% and 35% of ferrite,at most 5% of fresh martensite,at most 15% of bainite.

Provided are: a tailored blank material that comprises a joining section with excellent formability and that is formed from metal materials of different strengths; and a method for manufacturing the tailored blank material simply and efficiently. Also provided is a press-molded article for which this tailored blank material is used. This method for manufacturing a tailored blank material is characterized in that one member and another member are joined by linear friction welding and in that the difference between the tensile strengths of the one member and the other member is at least 150 MPa. When the welding pressure applied during the linear friction welding is P, the temperature at which the tensile strength of the one member reaches P is T1 (° C.), and the temperature at which the tensile strength of the other member reaches P is Y2 (° C.), it is preferable for P to be set so that the difference between T1 and T2 is 100° C. or less.

The present invention provides a steel sheet having a tensile strength of 1310 MPa or more and excellent press formability in a steel having a martensite structure as a main body and excellent delayed fracture resistance. The steel sheet is characterized by having a composition consisting of, in mass%, C: 0.12% to 0.40%, Si: 1.5% or less, Mn: 1.7% or less, P: 0.05% or less, S: 0.010% or less, sol. Al: 1.00% or less, N: 0.010% or less, Ti: 0.002% to 0.080%, and B: 0.0002% to 0.0050%, with the remainder being Fe and inevitable impurities, and a metal structure in which the area ratio of a martensite to the entire structure is 95% or more, the length L S of sub-block boundaries in the martensite is 0.5 to 2.0 μm, and the ratio L B / L S of the length L B of the sub-block boundaries to the length L of the block boundaries satisfies a prescribed formula (1), and the tensile strength is 1310 MPa or more.

The application discloses a method suitable for improving the structure uniformity of an arc additive manufacturing AZ series magnesium alloy, and the method comprises the following steps: 1, selecting a hot-rolled AZ31 plate as a substrate; 2, performing three-dimensional modeling and slicing processing according to a target magnesium alloy workpiece, and designing a deposition path; 3, preheating the substrate, adjusting the distance between an electrode and the substrate and inputting a protective gas; and 4, performing arc additive manufacturing in an inner layer rotary deposition mode according to the deposition path to obtain the AZ series magnesium alloy workpiece. The application takes plasma arc welding as a heat source, has the advantages of fast preparation rate, accurate heat input control, good arc stiffness, effectively reduced spatter, good workpiece formability, and the like; the rotary deposition mode is adopted to effectively control heat cycle, avoid abnormal structure growth, and simultaneously adopt an auxiliary interlayer hammering deformation means to optimize a deposition interface, so that the obtained AZ series magnesium alloy workpiece has the advantages of uniform structure, small grain, few defects, excellent strength and plasticity, and the like, and the process is simple and easy to popularize.

This invention relates to the field of aluminum alloy materials technology, specifically to a low-zinc-content 6-series aluminum alloy sheet and its manufacturing method. The components and their weight percentages in the low-zinc-content 6-series aluminum alloy sheet are as follows: Si content 0.90-1.20%, Mg content 0.45-0.65%, Cu content 0.12-0.20%, Zn content 0.05-0.10%, Fe content ≤0.28%, Mn content 0.02-0.20%, Cr content ≤0.10%, Ti content ≤0.15%, containing at least one of In, Cd, La, and Ce, and the total content of In, Cd, La, and Ce is 0.01-0.10%; the content of a single impurity ≤0.03%; the total content of other impurity elements ≤0.1%; and the balance is Al. This 6-series aluminum alloy sheet, with a low zinc content (Zn ≤0.10%), possesses excellent formability, high bake hardening value, and high batch stability.

The invention relates to the technical field of metal materials, in particular to a 5-series aluminum alloy plate with low-temperature baking hardening response and a preparation method of the 5-series aluminum alloy plate. The content of Zn is 1.5%-3.5%; the content of Cu is 0.3%-1.2%; the content of Mn is 0.1 to 0.3 percent; the content of Cr is 0.03 to 0.15 percent; the content of Zr is 0.05 to 0.15 percent; the content of Ti is 0.01 to 0.10 percent; si content is less than or equal to 0.2%; fe content is less than or equal to 0.25%; the La content is less than or equal to 0.2%; the Ce content is less than or equal to 0.2%; the content of Yb is less than or equal to 0.2%; the balance is Al; the bake hardening response efficiency function phi BH of the 5-series aluminum alloy plate is 0.15-1.2; the steel plate has low yield strength, high elongation, high formability and high sinking resistance, and baking varnish hardening is guaranteed.

The invention provides an evaluation method for rapidly predicting the formability of a plate. The evaluation method comprises the following steps: S1, preparing a standard dumbbell-shaped uniaxial tensile sample; s2, preparing a plane strain tensile sample; s3, performing uniaxial tension on the standard dumbbell-shaped uniaxial tension sample; s4, performing uniaxial tension on the plane strain tensile sample; s5, calculating abscissa and ordinate values of three key feature points in the forming limit curve according to the material thickness t, the first correction coefficient and the second correction coefficient; s6, correcting the numerical value of the ordinate in the key feature point by using the first correction coefficient and the second correction coefficient to obtain a corrected ordinate; s7, drawing a forming limit judgment curve; and S8, the forming limit judgment curve is input into finite element simulation analysis software. The method greatly improves the analysis efficiency and prediction precision of the formability of the sheet metal, is especially suitable for the occasion of forming analysis of metal sheet parts, and widely meets the application requirements of engineering practice and scientific research work.

This invention provides a 5-series aluminum alloy sheet and its preparation method, relating to the field of aluminum alloy technology. The preparation method includes: S1, mixing the metal raw materials of the 5-series aluminum alloy sheet according to a specified ratio and sequentially melting and casting to obtain an aluminum alloy ingot; S2, sequentially subjecting the aluminum alloy ingot to homogenization treatment, hot rolling treatment, first cold rolling treatment, intermediate annealing, and second cold rolling treatment to obtain a cold-rolled sheet; S3, sequentially subjecting the cold-rolled sheet to final annealing, cooling treatment, and straightening treatment to obtain the 5-series aluminum alloy sheet; wherein the Fe element content in the 5-series aluminum alloy sheet is not less than 0.25% by mass, the final annealing temperature is 520~550℃, the final annealing holding time is 10~60s, the final annealing heating rate is 5~15℃ / s, and the cooling rate of the cooling treatment is 8~16℃ / s. The prepared 5-series aluminum alloy sheet exhibits excellent mechanical properties, formability, and surface quality.

The disclosed specification relates to a ferritic stainless steel having improved formability by controlling the average grain diameter through alloy components and manufacturing processes and to a method for manufacturing same. A ferritic stainless steel having improved formability, according to an embodiment, may comprise, in percentage by weight: C: 0.0005-0.02%; N: 0.005-0.02%; Si: 0.01-1.0%; Mn: 0.01-1.0%; P: 0.001-0.05%; Cr: 10.0-30.0%; Nb: 0.05-0.5%; Ti: 0.05-0.5%; and the remainder being Fe and inevitable impurities, wherein an Erichsen height may be 6-50 mm.

The application belongs to the technical field of magnetic material preparation, and particularly relates to a high-saturation low-loss soft magnetic composite material and a preparation method and application thereof. The preparation method comprises the following steps: (1) uniformly mixing first powder and second powder to obtain a mixture; wherein the composition of the first powder comprises iron, silicon and chromium, and the composition of the second powder comprises iron and nickel; (2) mixing the mixture with resin, pressing and heat treating; and the temperature of the heat treatment is not higher than 220 DEG C. The application can prepare a soft magnetic material with high saturation characteristics, low loss and high pressing density, and the soft magnetic material has good formability and is not prone to cracking during heat treatment. The application does not need to go through a relatively complex step such as coating when preparing the high-saturation low-loss material, thereby simplifying the process.

The present invention discloses a high-throughput evaluation and optimization method for the formability of suspended structures in additive manufacturing, comprising the following steps: establishing a high-throughput evaluation model for suspended structures; preparing the evaluation model using target process parameters; determining the limit forming dimensions based on the formability of different suspended lengths, and establishing a high-throughput optimization model for the corresponding structural dimensions of suspended structures with actual component suspended lengths greater than the limit forming dimensions; preparing the optimization model using the corresponding process parameters; and preparing a verification part based on the optimized model structure with the best formability. The present invention can efficiently screen the formability of suspended structures of different materials and the corresponding optimization targets. While ensuring minimum machining allowances and optimal forming quality, it can quickly obtain a characteristic structural model suitable for additive manufacturing, significantly reducing optimization time.

The application provides a Cr-Nb series 590MPa grade high-coating steel plate for automobile exposed parts and a preparation method thereof, and belongs to the field of hot-rolled pickling plates.The composition of the application comprises C, Si, Mn, P, S, Als, Cr, Nb, Fe and inevitable impurity elements;1.7%<=Mn+Cr<=2.1%, 2.0<=Mn / Cr<=3.0, 19<=Cr / Nb<=30 are controlled;in production, the heating, rolling and pickling processes are optimized.Compared with the prior art, the application adopts Cr-Nb composite micro-alloying, cooperates with Mn / Cr and Cr / Nb control, improves the strength and formability;the Cr-Nb composite addition makes the iron oxide scale on the surface of the steel plate thinner and more uniform, the production process is optimized, and the high strength, high formability and good coating performance are obtained.

Provided is a high-strength steel sheet having excellent member strength, stretch flangeability, bendability, and delayed fracture resistance under atmospheric corrosion and in a coated state. The steel sheet has a prescribed component composition, microstructure and the like, the average value [tau q] of the plastic deformation initiation stress [tau q] measured by nanoindentation at a position 1 / 4 of the sheet thickness of the steel sheet is 2.50-4.10 GPa, the standard deviation [sigma q] of the tau q is 0.30 GPa or less, and the average value [tau q] of the plastic deformation initiation stress [tau q] is 0.30 GPa or less. When [tau s] is the average value of the plastic deformation start stress [tau] s measured by the nanoindentation method at a position 10 [mu] m from the surface of the steel sheet, the ratio of measurement points less than 0.85 * [tau s] is 25.0% or less.

The invention discloses a vacuum induction melting method for AlSn20Cu, and relates to the technical field of aluminum alloy preparation. The method aims to solve the problems of high gas content, more inclusions, tin segregation and poor formability of cast ingots caused by traditional atmospheric smelting. The method comprises the following steps: preparing raw materials and a mold of a lining graphite pipe, and preheating; the pure aluminum, the AlCu50 intermediate alloy and the AlSn50 intermediate alloy are loaded in sequence; after vacuumizing, inert gas is filled, and furnace burden is melted through furnace baking and melting; after stirring and standing at 760 DEG C, cooling to 720 DEG C, and carrying out vacuum degassing refining; and finally, carrying out electrified casting to a mold at 700 DEG C under the vacuum degree of 2000-3000 Pa. According to the method, vacuum induction melting is combined with a specific graphite pipe lining mold, gas and inclusions are effectively reduced, the density and the structure uniformity of the cast ingot are improved, the process is simplified through process integration, and the obtained cast ingot is accurate in component and few in defect and meets the requirement of a high-performance sliding bearing material.

The application discloses a kind of steel plate materials resistant to 700 DEG C, wet hydrogen sulfide environment, component includes by weight percentage: C:0.07-0.13%, Si:0.20-0.50%, Mn:0.30-0.60%, Cr:7.0-9.0%, Mo:1.00-1.20%, W:1.50-2.00%, Nb:0.06-0.10%, V:0.15-0.25%, N:0.040-0.100%.Its preparation method includes: smelting, casting, heating, rolling, heat treatment is normalized heat treatment after martensite is decomposed again, then stabilization treatment is carried out.The steel plate material prepared by the application has high-temperature tensile strength of 410-450 MPa at 700 DEG C, transverse elongation after fracture of 31.0-34.0%, and longitudinal elongation after fracture of 33.0-35.0%.

This invention belongs to the field of metal rolling technology, specifically a method for producing corrosion-resistant hot-rolled metal composite profiles. It involves preparing a metal composite billet using one solid metal round billet and N layers (N≥1) of metal tube billets, and obtaining the metal composite profile through hot continuous rolling. This method allows for the economical production of corrosion-resistant hot-rolled metal composite profiles according to national standards. The combined rolling process using an asymmetric three-roll Y-type mill and a two-roll continuous rolling mill causes the metal composite billet to undergo plastic deformation under triaxial asymmetric compressive stress, achieving metallurgical bonding at the metal interface and resulting in good strength. The process is characterized by a short flow, low metal loss and energy consumption, simple equipment structure, and low investment and production costs. The produced corrosion-resistant hot-rolled metal composite profiles exhibit good machinability, plastic formability, and excellent corrosion resistance.

Provided are: a steel sheet and member having excellent press formability and collision characteristics, and having tensile strength of 1180 MPa or more; and methods for producing the steel sheet and member.　This steel sheet has: a component composition containing prescribed amounts of C, Si, Mn, P, S, sol. Al, and N, with the balance being iron and inevitable impurities; and a steel structure in which the area ratio of polygonal ferrite is less than 10%, the area ratio of bainite is 10% to 60%, the area ratio of tempered martensite is 70% or less (excluding 0%), the area ratio of retained austenite is 5% to 20%, the total area ratio of the remaining structure is 5% or less (including 0%), the average amount of solute C in retained austenite adjacent to bainite or ferrite is 0.60 mass% or more and less than 1.20 mass%, and the number density of retained austenite adjacent to bainite or ferrite is 2.0 × 105 per 1 mm2 or more.

This invention discloses a method for producing easily formable ultra-high strength steel plates for engineering machinery, belonging to the field of metal material processing technology. This invention employs a medium-carbon + multi-element microalloying system, and through converter steelmaking + refining, continuous casting, billet heating, two-stage controlled rolling, and quenching + tempering heat treatment, produces ultra-high strength steel plates with a thickness of 5-20 mm. The resulting steel plate has a matrix structure of ultra-fine-grained lath martensite with an effective grain boundary size of 1.2-1.5 μm, a yield strength ≥1500 MPa, a tensile strength ≥1800 MPa, an elongation >10%, an impact energy >50 J at -40℃, and meets the requirements of D=6a and 180° bending without cracking. It possesses ultra-high strength, excellent low-temperature toughness, and cold formability, and can be directly used for forming key load-bearing structural components of engineering machinery. The process is simple and highly adaptable to industrial applications.

This invention relates to a cold-rolled steel sheet and a method for manufacturing the same, and more specifically, to a cold-rolled steel sheet with both excellent strength and formability, and a method for manufacturing the same.

The present invention relates to the technical field of hot-rolled high-strength steel production, specifically a high-strength and toughness, low-yield ratio thin steel plate for concrete mixer trucks and its manufacturing method. The steel plate comprises the following chemical components by weight: C: 0.10% to 0.15%, Si: 0.60% to 0.90%, Mn: 0.80% to 1.00%, P ≤ 0.015%, S ≤ 0.005%, Al: 0.25% to 0.29%, Cr: 0.40% to 0.60%, N ≤ 0.0040%, H ≤ 0.00020%, Nb: 0.008% to 0.030%, with the remainder being Fe and unavoidable impurities. Production costs are significantly reduced, and the product exhibits excellent performance, including high tensile strength, low yield ratio, good plasticity and toughness, high wear resistance, good fracture resistance, good formability, and low-temperature impact toughness. It can be a low-cost, comprehensive replacement for existing concrete mixer truck tank and blade manufacturing materials.

The present invention relates to a hot rolled steel sheet having excellent formability for a multi-stage press process, and a method for manufacturing same.

The present invention provides steel plates and components having a tensile strength (TS) of 980 MPa or more, and excellent formability, impact resistance, chemical conversion treatability, and delayed fracture resistance, as well as methods for manufacturing the same. It has a specific chemical composition, and the steel sheet surface coverage rate of Si-based oxides is 1% or less, At the 1 / 4 position of the plate thickness, the area fraction of ferrite is 3% or more and 30% or less, The area fraction of tempered martensite is 60% or more and 94% or less, The volume fraction of retained austenite is 3% or more and 15% or less, The steel sheet has a structure in which the area fraction of the remaining structure is 10% or less, and the ferrite has low-Mn ferrite in which the Mn concentration is less than 0.85 times the Mn content of the steel sheet, and high-Mn ferrite in which the Mn concentration is 0.85 times or more the Mn content of the steel sheet, and the proportion of the high-Mn ferrite in the ferrite is 20% or more and 90% or less in area fraction.