163 results about "Formability" patented technology

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 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.

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.

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.

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 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%.

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

The application provides 800MPa-grade hot-dip aluminized silicon high-hole-expanding multiphase steel and a preparation method thereof. The composition of the steel plate is as follows in terms of percentage by weight: C: 0.06% to 0.09%, Si: 0.1% to 0.4%, Mn: 1.8% to 2.5%, Cr: 0.1% to 0.4%, Mo: 0.05% to 0.3%, Ti: 0.01% to 0.03%, Nb: 0.01% to 0.03%, P: less than or equal to 0.02%, S: less than or equal to 0.005%, 1 / 3: less than or equal to Mo / Cr: less than or equal to 2 / 3, 2.2%: less than or equal to Mn+Cr: less than or equal to 2.8%, and the balance of Fe and inevitable impurities. The chemical composition of the coating includes the following components in terms of percentage by weight: Al content: 88% to 93%, and Si content: 7% to 12%. The production method of the steel plate comprises a series of processes such as smelting, hot rolling, pickling, cold rolling, continuous annealing and aluminized silicon plating, and the structure of the steel plate comprises ferrite, bainite and martensite. In terms of the planar area method, the ferrite content is 18% to 35%, the bainite content is 35% to 62%, and the martensite content is 10% to 40%. The mechanical properties of the steel plate of the application are as follows: tensile strength is more than 800MPa, yield strength is 620MPa to 750MPa, elongation is greater than 14%, and the hole-expanding value is more than 50%, so that the steel plate has good strength and plasticity and formability, and meanwhile, the hole-expanding performance is excellent.

The present invention provides a steel sheet containing Ni, Cu, Cr, and Sn, with a high N content, and having excellent deep draw formability, as well as parts containing the same. It has a predetermined chemical composition and [Ti]-[N]×47.88 / 14≧([N]-0.0021) 0.4 The chemical composition satisfies ×0.23, where [Ti] and [N] are the mass %) of Ti and N, satisfies 0.6×[Cu]+0.1×[Ni]+0.05×[Cr]+8×[Sn]≦0.650, where [Cu], [Ni], [Cr] and [Sn] are the mass %) of Cu, Ni, Cr and Sn, and the number density of Ti4C2S2 is 0.06 particles / μm 2 A steel plate and a component containing the same are provided, characterized by having the above-described metallic structure.

The object of this invention is to provide a high-strength hot-rolled flat steel product and a method for producing such a flat steel product, thus achieving a combination of high strength with high local cold formability and high economy in terms of steel. This is achieved through a high-strength hot-rolled flat steel product with high local cold formability, having a tensile strength Rm of at least 760 MPa, a yield strength ratio of at least 0.8, and a porosity of at least 30%, advantageously at least 40%, particularly advantageously at least 50%, at least 10%, preferably at least 16%, an elongation at break of at least 0.12, advantageously at least 0.17, and a ratio of local cold formability to overall cold formability of at least 5 and at most 13, and a microstructure consisting of more than 50% (by volume) bainite, no more than 10% (by volume), advantageously no more than 5% (by volume) carbon-rich microstructure such as martensite, retained austenite, pearlite, etc. The steel has a ferrite-based microstructure and the following chemical composition (wt%): C: 0.04–0.08; Si: 0.1–0.6; Mn: 1.0–2.0; P: maximum 0.06; S: ​​maximum 0.01; N: maximum 0.012; Al: not more than 0.06; Ti: not more than 0.18 and / or Nb: not more than 0.08; Mo: not more than 0.35; Ti+Nb greater than 0.06, wherein carbon and nitrogen exist in excess of stoichiometry according to the following formula: 1.0 < (C / 12 + N / 14) / (Ti / 48 + Nb / 93 + Mo / 96), the remainder being iron, including unavoidable steel-related elements.

The invention discloses a high-strength clad plate strip with excellent forming performance and a production method, the high-strength clad plate strip comprises a steel substrate and a low-alloy steel layer on at least one surface of the steel substrate, and a transition layer is formed on a contact interface of the steel substrate and the low-alloy steel layer; the tensile strength of the steel base plate is larger than or equal to 1600 MPa, and the hardness of the steel base plate is larger than or equal to 470 HBW. The low alloy steel comprises the following chemical components in percentage by weight: 0.001-0.04% of C, less than or equal to 0.1% of Si, 0.05-0.20% of Mn, less than or equal to 0.015% of P, less than or equal to 0.006% of S, 0.01-0.04% of Al, 0.01-0.04% of Ti, less than or equal to 0.005% of N and the balance of Fe. And the balance of Fe and inevitable impurity elements. The tensile strength of the low alloy steel is smaller than or equal to 350 MPa, the hardness is smaller than or equal to 120 Hv, and the ductility is larger than or equal to 30%.

[Problem] To further improve punch pullout properties while maintaining thinning moldability during DI molding. [Solution] This film-laminated steel sheet has a steel sheet serving as a base material, a film layer comprising a thermoplastic polyester film provided on the front and back surfaces of the steel sheet, and a wax layer provided on the film layer, the adhesion amount of the wax layer being in the range of 0.030-0.135 g / m2 per surface, and the adhesion amount of the wax layer being in the range of 0.030-0.135 g / m2 per surface. The adhesion amount of the wax layer is different on the surface on the front surface side and the surface on the back surface side of the steel plate, and the adhesion amount ratio obtained by dividing the adhesion amount of the wax layer on the surface on the side where the adhesion amount is large by the adhesion amount of the wax layer on the surface on the side where the adhesion amount is small is within the range of 1.05-1.35.

The invention relates to the technical field of ceramic additive manufacturing and high-temperature sintering tools, in particular to a design method of a sintering clamp for photocuring a large-size special-shaped ceramic component. Aiming at the problems of free opening edge curling, thin-wall collapse, cracks, overall warping and the like which are easy to occur during sintering of a photocuring ceramic green body, the method comprises the following steps: firstly, acquiring three-dimensional geometric information of a component and partitioning, and identifying an instability mode and a sensitive area; and then a boundary strategy of shape limitation without shrinkage limitation, controlled sliding, partition supporting and intersection area receding is constructed, structural design and material selection of the supporting ring, the inner supporting core, the burning bearing base, the low-friction isolation layer and the positioning groove are completed, and assembly and use specifications are formed. The sintering bearing clamp obtained by the method can inhibit out-of-plane instability while allowing the component to shrink, reduce shrinkage retardation stress, and improve the sintering formability stability, size consistency and finished product yield of the component. The ice cream barrel-shaped silicon nitride ceramic piece is taken as an embodiment, so that the sintering defect risk can be obviously reduced, and the engineering popularization value is good.

The present application belongs to the field of metal materials, and particularly relates to a high-forming hot-rolled pickling steel plate for automobiles and a production method thereof. The steel plate of the present application is mainly suitable for manufacturing automobile chassis structural parts. The chemical composition of the steel is designed as follows: C, Si, Mn, Al, Nb, Ti, Cr, Ni, Cu, Ta, Zr, Y, and Al / Si: 1.0-1.9, Ta+Zr: 0.017%-0.023%, and P≤0.015%, S≤0.005%, N≤0.003% are limited, and the balance is Fe and inevitable impurities. The present application has excellent mechanical properties, the yield strength is ≥590 MPa, the tensile strength is ≥890 MPa, the longitudinal elongation A is ≥32%, the hole expansion ratio is ≥52%, the longitudinal cold bending 180° D=a is qualified, the surface roughness Ra is 0.75-1.38 μm, and the corrosion rate of the steel plate is ≤0.42 g / (m 2 ·h).

The steel sheet has a TS of 1180 MPa or more and less than 1470 MPa, and has high YS, excellent ductility, excellent press formability of the inside and the ends of the steel sheet, and high crack propagation resistance. A base steel sheet has a predetermined component composition, the Vickers hardness of the base steel sheet is 84% or less with respect to a position 1 / 4 of the sheet thickness from the surface of the base steel sheet, the base steel sheet has a surface soft layer satisfying the following formula (1), the structure in the surface soft layer is within a specific range, and the structure in the position 1 / 4 of the sheet thickness of the base steel sheet is within a specific range. In a 90-degree V bending test having a bending radius of 0.5 mm, the length of a crack progressing in the ridge direction from the end of a bent ridge is 200 [mu] m or less, the El when subjected to a notch tensile test after being subjected to a heat treatment at 170 DEG C for 20 minutes is 6.0% or more, and the El when subjected to a notch tensile test after being subjected to a heat treatment at 170 DEG C for 20 minutes by introducing a 2% tensile nominal strain and then being subjected to a heat treatment at 170 DEG C is 5.0% or more. (1) 20 < = X < = 120-3800 * [Sb]-1900 * [Sn].

The invention discloses a high-speed heavy-load grinding bearing steel resin binder grinding wheel, and relates to the technical field of resin binder grinding wheels. Comprising 100-110 parts of an abrasive material, 3-4 parts of phenolic resin, 6-7 parts of polyimide resin, 1-2 parts of polyvinyl butyral, 4-5 parts of a fluorinated mixture, 2-3 parts of calcium oxide and 2-3 parts of a wetting agent, the abrasive material comprises microcrystalline ceramic, the particle size number of the microcrystalline ceramic is 80 #, and the product mark of the phenolic resin is 1875. The prepared grinding wheel is high in grinding formability, the consistent cutting rate, consistent roughness and consistent smooth finish are kept in the grinding process, the durability can reach several times of that of a common grinding material, the service life is greatly prolonged, meanwhile, stable grinding is provided, the heating amount is small in the grinding process, surface burning and microcracks of machined parts are reduced or avoided, and the machining quality is improved. Thermal deformation and thermal stress of the part in grinding are reduced, the service life of the machined part is prolonged, and reliability is improved.

The application discloses a high-toughness wear-resistant lining plate material suitable for a rod mill and a preparation method thereof, and belongs to the technical field of metal materials. The lining plate material meeting the use requirements of the rod mill is produced after the following treatments: medium-frequency induction furnace steel smelting, water glass sand casting forming, 950 DEG C heating annealing, 890 DEG C heating air quenching and cooling, and 600 DEG C heating tempering treatment. The high-toughness wear-resistant lining plate material prepared by the above preparation method has the advantages of low cost, good formability, high toughness, hardenability and quenching hardenability, and the rare earth elements are used for purifying, modifying and alloying treatment of the lining plate, so that the long service life of the lining plate is realized.

Provided is a technique for a steel sheet having a TS of 780 MPa or more and less than 1180 MPa, high YS, and excellent press formability of the inside and the ends of the steel sheet. A steel sheet in which a base steel sheet has a prescribed component composition and a Vickers hardness of 84% or less with respect to a position 1 / 4 of the sheet thickness from the surface of the base steel sheet, and which has a surface soft layer satisfying the following formula (1), the structure in the surface soft layer being within a specific range, and the structure in the position 1 / 4 of the sheet thickness of the base steel sheet being within a specific range, and a tensile strength of 780 MPa or more but less than 1180 MPa. 20 < = X < = 120-3800 * [Sb]-1900 * [Sn]... (1) (In formula (1), X is the thickness ([mu] m) of the soft surface layer, and [Sb] and [Sn] are respectively the contents (mass%) of Sb and Sn in the steel.