136 results about "Cold forming" patented technology

The application discloses a high cold formability austenitic stainless steel cold-rolled plate and a production method thereof, and solves the technical problem of poor cold formability of the austenitic stainless steel cold-rolled plate. The high cold formability austenitic stainless steel cold-rolled plate comprises the following components in percentage by mass: C: 0.035-0.045%, Si: 0.25-0.3%, Mn: 2-3%, Cr: 14-14.5%, Ni: 9-9.5%, N: 0.17-0.20%, Cu: 1.3-1.6%, Mo: 0.5-0.7%, and the rest is Fe and inevitable impurity elements. The production method of the high cold formability austenitic stainless steel cold-rolled plate comprises smelting, refining, slab continuous casting, cold rolling, heat treatment and coiling. The application can improve the cold forming performance of the cold-rolled plate, and meanwhile, guarantees that the microstructure performance of the cold-rolled plate is stable after forming.

According to the NM450 wear-resistant steel suitable for the polar working condition and the production method thereof, low-cost component design is adopted, and the process steps comprise smelting, refining, continuous casting, heating, rolling and heat treatment; the steel-making process and harmful elements are strictly controlled to improve the purity of molten steel so as to improve the internal quality of the steel plate, and a strict rolling, quenching and low-temperature tempering heat treatment process is adopted. The NM450 wear-resistant steel plate which is high in toughness adaptability, high in wear resistance and excellent in cold forming performance comprehensive performance is developed, the thickness ranges from 6 mm to 30 mm, the surface hardness ranges from 450 HBW to 480 HBW, the core hardness ranges from 440 HBW to 465 HBW, and the core hardness reaches 95% or above of the surface hardness; the yield strength is not less than 1200 MPa, the tensile strength is not less than 1400 MPa, and the elongation is not less than 13%; the impact AKV at-50 DEG C is greater than or equal to 60J, and the impact AKV at-60 DEG C is greater than or equal to 40J; the bending angle is 90 degrees, the bending diameter D is 6a, and the cold bending result is intact.

The invention relates to metallurgy, and more particularly to a sheet material made of titanium alloys that are resistant to high heat and oxidation and exhibit structural stability under prolonged operational exposure to temperatures in a range of up to 800° C. and can be used for manufacturing components of a vehicle exhaust system. The present titanium alloy sheet material for the manufacture of components contains: 1.5-3.0 wt % aluminium, 0.1-0.5 wt % molybdenum, 0.1-0.6 wt % silicon, not more than 0.2 wt % iron, not more than 0.15 wt % oxygen, not more than 0.1 wt % carbon, not more than 0.03 wt % nitrogen, not more than 0.015 wt % hydrogen, and the balance titanium. The sheet material has high creep resistance and oxidation resistance values, as well as a stable structure under prolonged operational exposure to temperatures in a range of up to 800° C. The material is suitable for cold forming.

Method of manufacturing a steel strip comprising the steps of: - casting a molten steel into a slab; - reheating the slab at a temperature of 1150°C or more for a time of 1 hour or more; - hot rolling the steel into a strip, preferably using an average F1 slab entry temperature of more than 1000°C; - coiling the hot rolled steel strip; - batch annealing the steel strip: - at a temperature in the intercritical range (i.e. between Ac1 and Ac3), preferably less than 700°C; - in a non-oxidizing and non-nitrogenizing atmosphere; - for a total annealing time of at least 5 hours, preferably at least 10 hours so as to obtain: a Mn enrichment in austenite such that the Mn content is at least 1.25 times the overall Mn content of the steel; and a C enrichment such that the C content is at least 1.2 times the overall C content of the steel; - cooling the steel after batch annealing in air, forced air or water quenching.

A tool (100) for cold forming of splines on a pre-machined blank includes an annular shaped die holder (102) and an annular shaped die (104) concentrically fixed to the die holder (102). The die (104) includes splined profile matching profile of the splines to be formed on an inner circumference of the annular shaped die (104). The tool (100) is configured to concentrically locate the blank (300) over the die (104) such that when the blank is forced against the die (104), the splined profile of the die (104) deforms the spline portion (304) of the blank (300) to generate the splines. The blank includes an undercut located between a gear portion (302) and a spline portion (304) of the blank to accommodate material flow due to deformation of the spline portion (304) of the blank (300) during generation of the splines.

The invention discloses a method for preparing a clad plate strip by adopting a hot continuous rolling process and the clad plate strip. The method sequentially comprises the steps of plate blank heating, rough rolling, clad blank preparation, clad rolling, controlled cooling and coiling, wherein a plate blank is subjected to surface polishing after being subjected to rough rolling and dephosphorization, then is subjected to preliminary covering and welding with a to-be-covered plate strip to form a covering blank, and then enters a finishing mill group to be subjected to covering rolling; the surface polishing of the plate blank, the preliminary covering of the to-be-covered coil and the welding are all carried out in an atmosphere protection cover, and N2, CO2 or a mixed gas of N2 and CO2 is introduced into the atmosphere protection cover; the plate blank is made of carbon steel; and the plate strip to be covered comprises titanium, copper or stainless steel. According to the invention, the hot continuous rolling process is adopted to produce the clad plate strip on line, the clad plate strip integrates the excellent characteristics of corrosion resistance, electric conduction, heat dissipation and beauty of the clad layer and high strength of the substrate, and the cost is lower and the application range is wider to the greatest extent; the product has the characteristics of corrosion resistance, good heat dissipation performance, easiness in cold forming processing, attractive appearance and no coating.

The present application relates to the technical field of plastic precision forming of metal profiles, and specifically to a precision plastic forming method and equipment for metal profiles. The equipment is provided with an upper die movement mechanism and a lower die setting mechanism. The movement execution mechanism of the upper die movement mechanism is installed with a bus roller set. The lower die plate of the lower die setting mechanism is installed with a bottom die cavity with different profile structures. Through one-way linear movement of the hydraulic cylinder of the movement execution mechanism and extrusion and shearing of the bus roller set, metal flow fills the bottom die surface to realize the processing of the metal profile. The present application can be used for the forming of metal profiles with different specifications and cross-sectional forms, including but not limited to channel steel, bulb steel and other products. The present application can be used for ferrous metals, non-ferrous metals, composite materials and the like, and can also be used for hot forming, warm forming and cold forming. The present application is a local incremental forming method, which has the advantages of high forming efficiency, high product size precision, small springback, good flatness, small forming force and the like.

The invention belongs to the technical field of metal processing lubrication, and provides high-extreme-pressure anti-wear emulsion type expanding oil and a preparation method of the high-extreme-pressure anti-wear emulsion type expanding oil. Comprising the following steps: compounding naphthenic base oil, polyalkyl benzyl sulfide, vulcanized vegetable oil, sodium dodecyl benzene sulfonate, octylphenol polyoxyethylene ether, benzotriazole and methyldiethanolamine according to specific parts by mass to construct a carrier-extreme pressure-emulsification-corrosion prevention integrated system; wherein the naphthenic base oil (the kinematic viscosity at 40 DEG C is 350-400 mm / s) provides a stable carrier, the polyalkyl benzyl sulfide (the sulfur content is 20-30%) is a chloride-free extreme pressure core, the composite emulsifier ensures the stability of the system, and efficient protection is realized through double-component corrosion prevention; according to the invention, the 3% emulsion can be stably placed for more than or equal to 2 weeks, the maximum non-seizure load is more than 1800N, the emulsion is suitable for expanding large-diameter steel pipes made of Q235A, X70 / X80 and the like and cold forming processing of metal, the problems of insufficient extreme pressure, unstable emulsification, poor environmental protection property and the like of the existing product are solved, and the processing quality and efficiency are improved.

The application provides a hot-dip aluminum-silicon 980MPa Q&P steel cold forming steel plate and a preparation method thereof, and the component of the hot-dip aluminum-silicon base plate is as follows in percentage by mass: C: 0.18% to 0.24%, Si: 1.4% to 2.8%, Mn: 1.9% to 2.5%, P: less than or equal to 0.02%, S: less than or equal to 0.005%, Ti: 0.01 to 0.04%, Nb: less than or equal to 0.04%, Al: less than or equal to 0.005%, and the balance of Fe and inevitable impurities. The preparation method comprises a series of processes such as smelting, hot rolling, pickling, cold rolling, continuous annealing hot-dip aluminum-silicon, and finishing, and the hot-dip aluminum-silicon is ingeniously carried out in the slow cooling stage, perfectly matches the heat treatment system, breaks the limitation that the hot-dip galvanized steel plate must be over-aged at high temperature for a short time, and can make the bainite transformation sufficient; the hot-dip aluminum-silicon 980MPa Q&P steel produced by the application has excellent strength and plasticity.

This invention discloses an electric field-assisted spline cold forming method and machine tool; this invention belongs to the technical field of machining and metal plastic forming equipment; it aims to solve the problems of high load, rapid mold wear and poor forming quality in the cold forming of splines of difficult-to-deform materials such as high-strength alloy steel and titanium alloy; the positive terminal of the pulse power supply forms a circuit with the workpiece through the center and the negative terminal through the brush, so that the high-frequency pulse current flows directly through the cold forming deformation zone, inducing the electroplastic effect, reducing the yield strength of the material and improving plasticity; on this basis, the symmetrically arranged cold forming tools apply radial force to the workpiece as the spindle rotates, and the spline teeth are formed by the axial feed and rotation of the workpiece; this method deeply couples electric field softening with mechanical forming, fundamentally reducing the forming load, extending the mold life and improving the spline dimensional accuracy and surface quality.

The invention relates to the technical field of metal heat treatment, in particular to medium-carbon structural steel for cold forging hub bearings and a continuous spheroidizing annealing process thereof.The medium-carbon structural steel for the cold forging hub bearings in a hot rolling state is slowly heated to the temperature below Ac1 and then heated to the temperature within the Ac1-Ac3 two-phase region temperature range for heat preservation, the medium-carbon structural steel is cooled to Ar3 according to the set cooling speed for heat preservation, and then the medium-carbon structural steel for the cold forging hub bearings is obtained; and cooling to the temperature below Ar1 according to the set cooling speed, preserving heat, entering a non-heat-supply section, slowly cooling, and discharging from the furnace. According to the method, control over the heating rate below Ac1, heating near Ac3 and grading isothermal treatment near Ar3 and below Ar1 are introduced into a traditional spheroidizing annealing system, optimization regulation and control over the carbide form and distribution state are achieved, the morphology stability of spheroidizing carbide is improved, abnormal structure generation is inhibited, the spheroidizing rate is larger than or equal to 80%, finally, the hardness of round steel is stably controlled within the interval of 160-170 HBW, and the spheroidizing quality is improved. And the work hardening sensitivity and the cracking tendency in the material cold forming process are effectively reduced, and the plasticity and the surface quality of the material are improved.

The application discloses a laser composite self-punch riveting process for aluminum alloy plate connection and belongs to the technical field of metal material connection. The process prepares a precise micro-groove structure in a connection area through femtosecond laser, combines ultrasonic deep cleaning and controllable pressure riveting process, and realizes the synergistic strengthening of interface mechanical interlocking and metallurgical bonding. Specifically, the process includes material surface treatment, laser micro-texturing processing, high-precision positioning, cold forming riveting and interface strengthening stages. The laser cold processing technology is used to avoid thermal damage, significantly improve the interface bonding strength and fatigue resistance, and the application discards the traditional adhesive process, effectively solves the riveting stress concentration and adhesive layer environmental aging problems, is suitable for the high-reliability connection demand of lightweight structures, and especially exhibits excellent environmental tolerance under complex working conditions.

The invention relates to a method for producing a cylindrical metal connector, wherein the connector comprises a tubular body with two internally hollow cylindrical areas joined by an intermediate area with a polygonal outer edge. The method is characterised in that the metal connector is produced from a single tubular metal element by means of a step of cold forming using a first tubular expansion tool intended to be in contact with the side wall of the tubular metal element, the first tool being provided with a section comprising a plurality of radially expandable segments shaped to provide the form of the polygonal intermediate section, each segment having a protruding edge. The segments are expanded by the action of a punch, such that, when the punch moves towards the first tool, as the punch is inserted into the first tool, the segments expand towards the side wall of the tubular body to be shaped, thereby forming the intermediate area with a polygonal edge.

The present disclosure relates to designing of steel composition for line pipe steel to be used for sour environment. The developed steel of the present disclosure exhibits enhanced tensile properties in accordance with API 5L PSL-2 specification for X-65 grade steel, along with superior hydrogen induced cracking resistance with crack length ratio (CLR) of less than 10%, crack thickness ratio (CTR) of less than 5%, crack sensitivity ratio (CSR) of less than 2%. The developed steel is designed such that it is readily hot / cold formed and welded to form linepipe tubes to be used for the transportation of natural gas or crude oil, especially of sour grade. The present disclosure also provide a method of manufacturing the said steel having the composition of the present disclosure.

The invention relates to a method for producing a fluid pump and to a fluid pump, in particular an oil pump, having a housing, wherein a chamber extends along a first direction starting from a first end face of the housing to a second end face of the housing, wherein a piston is movably arranged in a pump section of the chamber, wherein an at least annular sealing section of the piston sealingly rests against an inner wall of the pump section of the piston chamber, wherein a delivery line is formed in the piston, wherein the delivery line extends from a first end face of the piston to a second end face of the piston, wherein the first end face of the piston is arranged outside the chamber, wherein the second end face of the piston is arranged inside the chamber, wherein the delivery line is designed to conduct fluid from the first end face of the piston into the chamber, wherein the piston and / or the housing are made of cold-formed metal.

The invention discloses a corrosion-resistant and high-performance aluminum alloy cable material as well as a preparation method and application thereof, and relates to the technical field of aluminum alloy preparation. The component formula of the conductor is Al-xMg-ySi-zNi-mCe-nSc-qY, x is larger than or equal to 0.05 and smaller than or equal to 0.3, y is larger than or equal to 0.6 and smaller than or equal to 1.4, z is smaller than or equal to 0.35, m is larger than or equal to 0.01 and smaller than or equal to 0.2, n is larger than or equal to 0.03 and smaller than or equal to 0.2, q is larger than or equal to 0.04 and smaller than or equal to 0.1, iron is a main impurity element in the alloy, and the content of the iron is not larger than 0.1%. The aluminum alloy cable material with excellent mechanical properties (the tensile strength is larger than or equal to 122 MPa, and the elongation is larger than or equal to 14%), electrical properties (the conductivity is larger than or equal to 62% IACS) and corrosion resistance (the maximum IGC depth is smaller than 100 micrometers) is prepared by adopting the technological method of flame direct injection smelting, synchronous water quenching pull casting, cold forming machining and non-isothermal aging synchronous heat treatment, and the aluminum alloy cable material is suitable for aluminum alloy cables. The method is short in technological process, good in cable quality, high in corrosion resistance and wide in application prospect.

This invention discloses a hot-spinning composite forming method for thin-walled cylindrical titanium alloy parts based on cold spinning-assisted final forming, belonging to the field of metal material plastic forming. This invention addresses the limitation of deformation under cold forming conditions in titanium alloys due to their high resistance to room temperature deformation and poor plasticity, which easily leads to cracking or surface defects. The invention first preheats the blank, mandrel, and spinning wheel using a flame gun. During the spinning process, an infrared thermal imager is used to monitor the temperature, ensuring a stable spinning temperature for the blank. After hot spinning is completed, a low-speed rotation of the spinning machine spindle combined with low-temperature air cooling ensures uniform cooling of the blank, allowing for rapid transition to the cold spinning process and improving forming efficiency. Simultaneously, this invention employs a larger thinning rate during hot spinning to reduce the number of hot spinning passes, and a smaller thinning rate during cold spinning to increase the forming limit, prevent cold spinning cracking, and improve forming accuracy. This invention meets the increasingly stringent requirements for the comprehensive performance of components in high-end applications.

The invention belongs to a plastic processing technology, and relates to a cold and hot combined extrusion forming device and method for improving the thickening ratio of an aluminum alloy pull rod. In the differential temperature hot extrusion process, a pipe closing-in area is still in a warm forming temperature range, and the mechanical property of materials in the area can be reduced. The cold and hot combined extrusion forming device comprises a thickening mold, a heating ring, a heat insulation plate, a closing-in mold and a thermocouple, the heat insulation plate is arranged between the butt joint end faces of the thickening mold and the closing-in mold, and after the thickening mold, the heating ring and the closing-in mold are combined, a complete thickening closing-in cavity is formed inside. Wherein the cavity span of the thickening mold comprises a non-closing thickening area and a partial closing area, and the cavity span of the closing mold is the remaining closing area; a heating ring is arranged on the outer ring face of the thickening die, and the thermocouple penetrates through the heating ring and extends to be close to the inner wall of the thickening die. Compared with a differential temperature hot extrusion process needing an additional cooling device to cool a non-deformation area of the pipe, plastic deformation of the pipe closing-in area belongs to cold forming, the instability risks of pipe wrinkling, buckling and the like can be reduced, the pipe thickening forming limit is improved, the mechanical property of the extruded pipe can be improved through the cold work hardening effect, and the device is simple in structure and low in cost. And a pipe cooling device is not needed. In addition, only the thickening mold is heated, and the mold preheating time is shortened.

Steel flat product for cold forming consisting of a steel substrate coated with a protective coating, wherein the protective coating consists of an inner Al-Si-containing and an outer alkaline earth oxide and / or transition metal oxide-containing layer, and wherein the steel substrate has a composition containing (in wt.%): - up to 0.09 carbon - up to 0.3 silicon - up to 0.9 manganese - up to 0.025 phosphorus - up to 0.02 sulfur - up to 0.1 aluminum - up to 0.14% titanium and / or niobium - up to 0.001 boron, and possibly - further alloying elements selected from the group up to 0.01 N, up to 0.15 Cu, up to 0.15 Cr, up to 0.15 Ni, up to 0.025 Mo, and / or up to 0.05 Sn, and - Residual iron and unavoidable impurities.

A steel for cold forming comprising of the following elements, expressed in percentage by weight:0.03% ≦ C ≦ 0.18%;1.2 % ≦ Mn ≦ 2.5%;0.05% ≦ Si ≦ 1.5 %;0.01% ≦ Cr ≦ 2%;0.001% ≦ Al ≦ 0.1%;0.01% ≦ Nb ≦ 0.12%;0.001% ≦ Ti ≦ 0.1%;0.003% ≦ Mo ≦ 1%;S ≦ 0.015%;P ≦ 0.015%;N ≦ 0.01%; 0% ≦ Ni ≦ 1%;0 ≦ B ≦ 0.01%; 0% ≦ V ≦ 0.5%;0% ≦ Mg ≦ 0.010%;0% ≦ Zr ≦ 0.010%;0% ≦ Ce ≦ 0.1%;0% ≦ Ca ≦ 0.005%;0% ≦ Cu ≦ 1%;the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel having microstructure comprising in area fraction, 40% to 90% of Granular Bainite, 10% to 40% of Martensite- Austenite islands and the amount of niobium present as carbides, nitrides and / or carbo-nitrides is equal to or more than 50% of the nominal niobium content present in the steel.

The invention relates to a medical palladium-platinum alloy rod and a hot-forging non-cutting forming process thereof, the forming process comprises the following steps: performing high-frequency smelting and casting on raw materials to obtain a palladium-platinum cast rod, and sequentially performing multi-stage reducing hot forging and cold forming on the palladium-platinum cast rod to obtain a turning-free medical palladium-platinum alloy rod; wherein the multi-stage hole shrinkage hot forging is carried out by matching a multi-stage forging die with an air hammer, the total deformation is more than 50%, and the multi-stage hole shrinkage hot forging method comprises the following steps of: (1) preheating a palladium-platinum casting rod to be more than 1000 DEG C, and keeping the temperature for not less than 90 minutes; (2) under the condition that the temperature is not lower than 900 DEG C, multi-stage hole shrinkage hot forging is continuously or intermittently carried out, a hot-forged bar is obtained, and the hole shrinkage ratio of each stage of forging die ranges from 5% to 25%; and (3) in a vacuum environment of 10 <-1 > Pa or below, the hot-forged bar is heated to 1000 DEG C or above, heat preservation is carried out for not less than 20 min, the temperature is reduced to 600-800 DEG C, heat preservation is carried out for 40-60 min, and then natural cooling is carried out.

Provided in the present disclosure is hot-rolled strip steel having a yield strength of greater than or equal to 900 MPa. In addition to Fe and inevitable impurities, the hot-rolled strip steel further comprises the following chemical elements in percentages by mass: 0.07-0.2% of C, 0.02-0.20% of Si, 1.2-2.5% of Mn, 0.3-1.0% of Cr, 0.13-0.2% of Ti and 0.01-0.06% of Al. Further provided is a manufacturing method for the hot-rolled strip steel, the method comprising: subjecting a plate blank to heating, rough rolling and finish rolling to obtain strip steel, then subjecting the strip steel to a staged online quenching treatment, and subjecting same to coiling, a water blowing treatment and a tempering heat treatment. The hot-rolled strip steel of the present disclosure has an alloy cost significantly lower than that of the existing hot-rolled strip steel having a yield strength grade of 900 MPa, and also has relatively high plasticity and good cold formability.

The invention discloses ultrahigh-strength steel for cold forming of automobiles, which contains Fe and inevitable impurities and further contains the following chemical elements in percentage by mass: 0.16-0.21% of C, 0.16-0.22% of Cr, 0.16-0.22% of Mo, 0.12-0.12% of Mo, 0.12-0.12% of Mo and the balance 0.5 to 1.0 percent of Si; mn: 1.7 to 2.4%; b: 0.001 to 0.004 percent of the total weight of the raw materials; 0.01 to 0.05 percent of Al; 0.045% to 0.085% of Ti; the microstructure of the steel plate comprises acicular bainite, retained austenite and precipitated carbonitride. The invention further discloses a manufacturing method of the ultrahigh-strength steel. The manufacturing method comprises the following steps: smelting and casting; hot rolling; pickling and cold rolling; and annealing. According to the ultrahigh-strength steel, through the design of relatively low alloy components, excellent mechanical strength and forming performance are obtained.

The invention relates to a method (100) for producing a one-piece vehicle wheel (1), wherein the vehicle wheel (1) has a wheel disc segment (2) and a wheel rim segment (3), and wherein the method (100) comprises: providing (101) a one-piece preform (4) of a metal material, in particular a circular blank (4) of a metal material or a strip (4) of a metal material, wherein the metal material is specified by material quality and / or material thickness; forming a cylinder (5) from the provided one-piece preform (4) of a metal material, wherein the cylinder (5) comprises the wheel disc segment (2) and the wheel rim segment (3); profiling (103) the respective material thickness in different regions of the respective segment (2, 3) of the wheel disc segment (2) and / or the wheel rim segment (3) of the one-piece vehicle wheel (1) based on a cold forming method, in particular based on a spinning forming method.

The utility model discloses a high-barrier sewing forming packaging bag which comprises an upper film body and a lower film body, and the end edges of the upper film body and the lower film body are heat-sealed and encircled to form a bag body; the upper film body comprises an upper outer layer, an upper barrier layer and an upper functional layer which are sequentially arranged from the outside of the bag body to the inside of the bag body; the lower die body comprises a lower outer layer, a lower blocking layer, a lower inner layer and a lower functional layer which are sequentially arranged from the outside of the bag body to the inside of the bag body; and the upper functional layer and the lower functional layer are polyethylene films containing drying agents. The drying agent particles are mixed into the PE to form the upper functional layer and the lower functional layer, so that the validity period of the absorption instrument can be prolonged; the barrier layer is made of cold forming aluminum, so that a plane bag can be replaced by three-dimensional packaging, and high-barrier water and oxygen resistance can be realized; and the outer layer of the bag body adopts the nylon NY design, so that the puncture-resistant and wear-resistant effects of the packaging bag are improved.

The invention discloses a hot-rolled copper-clad plate strip and a production method, the hot-rolled copper-clad plate strip comprises a steel substrate and a copper layer on at least one surface of the steel substrate, and a copper-steel transition layer is formed on a contact interface of the steel substrate and the copper layer; the steel substrate comprises the following chemical components in percentage by weight: 0.04-0.09% of C, less than or equal to 0.10% of Si, 0.25-0.45% of Mn, less than or equal to 0.018% of P, less than or equal to 0.008% of S, 0.01-0.04% of Al, less than or equal to 0.005% of N, 0.01-0.028% of Ti and the balance of Fe. And the balance of Fe and inevitable impurity elements. The high-strength and wide-specification requirements are met, the yield strength is larger than or equal to 355 MPa, the tensile strength is larger than or equal to 490 MPa, the ductility is larger than or equal to 30%, the width can reach 700-1800 mm, the good copper-steel interface bonding strength, surface quality and cold-bending machining characteristics are achieved, the cold-bending forming performance meets the 180-degree cold-bending requirements of D = 0a, and the cold-forming machining requirements of high-strength structural parts in the fields of heat dissipation, electric conduction, corrosion resistance and decoration are met; moreover, steel and copper are compounded in the conventional steel hot continuous rolling production process, acid pickling, splitting and annealing processes after copper-clad rolling in an existing copper-clad process are omitted, the production efficiency is higher, and the cost is lower.

The present invention relates to the field of steel production technology, and in particular to a wide bearing steel strip and a manufacturing method thereof. The method comprises: subjecting a continuous casting billet that meets the GCr15 steel composition requirements to heat treatment; subjecting the heat-treated continuous casting billet to hot rolling treatment to obtain an initial steel strip; the reduction amount of the continuous casting billet during the rough rolling process accounts for more than 70% of the total reduction amount of the continuous casting billet during the hot rolling process; during the rough rolling process, the single-pass reduction rate is 18-40%; the initial steel strip is cooled to a coiling temperature and then coiled to obtain a wide bearing steel strip; the width of the steel strip is 1000-1400 mm, the thickness is 3.6-10 mm, the cooling rate is 10-20°C / s, and the coiling temperature is 580-620°C. The wide bearing steel strip obtained by the method of the present invention has a more uniform structure, no network cementite in the structure, better plastic deformation performance, and is more suitable for cold forming such as stamping.

The invention relates to the technical field of automobile part forming, in particular to a precise cold forming method and device for an ultrahigh-strength steel special-shaped section automobile safety part. Continuous rolling, high-frequency induction welding, multi-roller correction, precise punching and multi-direction bending forming are organically combined; integrated and continuous precision production from plates to complex space pipe fittings is achieved, the defects that in a traditional segmented tailor-welding process, the working procedures are tedious, weld joints exist, the hydraulic forming technology efficiency is low, and springback is difficult to control are effectively overcome, and therefore it is guaranteed that products have excellent structural integrity and dimensional precision, and the production efficiency is improved. The production efficiency and the material utilization rate are remarkably improved, and the production cost is reduced.

The invention discloses a production method for improving the cold forming performance of ultra-pure ferritic stainless steel, and belongs to the field of stainless steel production. The process sequentially comprises the steps of plate blank heating, rough rolling, finish rolling, coiling, thermal annealing and pickling, pre-rolling of a 20-roller mill, chrome steel wire shot blasting and pickling, rolling of the 20-roller mill, cold annealing and pickling, leveling of a temper mill, shearing and packaging. The method is characterized in that a composite rolling method of reciprocating rolling of the first two passes and the last two passes and one-way rolling of the middle pass is adopted in the cold rolling stage, and a roller sequence that a high-roughness F roller is used in the front section and a low-roughness H roller is used in the rear section is matched. By optimizing the hot rolling pass and the cold rolling process and cooperatively controlling the texture development, the strength of the favorable gamma fiber texture in the finished product is remarkably improved, the plastic strain ratio r value of the obtained 2D / 2B state cold-rolled steel coil is larger than 1.75, and the 2D / 2B state cold-rolled steel coil has excellent cold forming and deep drawing performance and can meet the high-end market requirement.