CN113957345A - 590 MPa-grade axle housing steel for cold stamping and preparation method thereof - Google Patents
590 MPa-grade axle housing steel for cold stamping and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention discloses 590 MPa-grade axle housing steel for cold stamping and a preparation method thereof, and belongs to the technical field of hot continuous rolling strip production. The 590 MPa-grade axle housing steel for cold stamping comprises the following chemical components in percentage by mass: 0.06-0.10% of C, 0.05-0.10% of Si, 1.50-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.008% of S, 0.030-0.040% of Nb0.025-0.035% of Ti, less than or equal to 0.006% of N, 0.015-0.050% of Als0.015, and the balance of Fe and inevitable impurities. The preparation method comprises the steps of smelting the chemical components of the 590 MPa-level axle housing steel for cold stamping into a plate blank, and sequentially heating, rough rolling, finish rolling, coiling and cooling the plate blank to obtain the 590 MPa-level axle housing steel for cold stamping. The product of the invention has simple production method, low alloy cost and excellent comprehensive performance, is suitable for the cold stamping forming process of the automobile axle housing, has good application prospect, and can effectively solve the problem of higher production cost of the existing high-strength axle housing steel.
Description
Technical Field
The invention belongs to the technical field of hot continuous rolling plate strip production, and relates to 590 MPa-grade axle housing steel for cold stamping and a preparation method thereof.
Background
The axle housing is one of the main components of an automobile chassis system, and is used for supporting a vehicle frame, and meanwhile, a speed reducer, a differential mechanism, a transmission device for driving wheels and the like are arranged in the axle housing, so that the axle housing is required to have sufficient strength, good stamping forming performance, good welding performance and the like. The manufacturing process of the automobile axle housing is mostly adopted before the automobile axle housing is manufactured, but the manufacturing process of the cast axle housing is complex, the production efficiency is low, heavy and high in cost, and the manufacturing process of the axle housing which is formed by stamping the hot rolled steel plate into the half axle housing and then welding has the advantages of high production efficiency, light weight and low cost, so that the hot rolled steel plate stamping and welding axle housing becomes the development direction of the existing automobile axle housing manufacturing.
CN111793774A of 10.20.2020 discloses a 620MPa grade cold stamping steel plate for an automobile axle housing and a preparation method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: less than or equal to 0.10 percent of C, less than or equal to 0.45 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.060 percent of V, less than or equal to 0.060 percent of Nb, less than or equal to 0.035 percent of Als, and the balance of Fe. The tensile strength of the product is more than or equal to 620MPa, but the high content of V element is added, and the alloy cost is high.
2018, 12 months, 28 days and CN109097702A disclose high-strength axle housing steel with good fatigue performance and welding performance and a preparation method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.04-0.07% of C, 0.05-0.15% of Si, 1.30-1.60% of Mn, less than or equal to 0.013% of P, less than or equal to 0.004% of S, 0.045-0.070% of Nb0.010-0.020% of Ti, less than or equal to 0.003% of N, 0.010-0.030% of Alt0.001-0.002% of O, less than 0.007% of Ti-2 xO-3.4 xN, and the balance of Fe and inevitable impurities. The tensile strength of the steel is more than or equal to 600MPa, and good fatigue performance and welding performance are realized through strict control of chemical components and a rolling and cooling control process, but the production control difficulty is increased.
Disclosure of Invention
The invention aims to solve the technical problem that the production cost of the existing high-strength axle housing steel is high.
The technical scheme adopted by the invention for solving the technical problems is as follows: the 590 MPa-grade axle housing steel for cold stamping comprises the following chemical components in percentage by mass: 0.06-0.10% of C, 0.05-0.10% of Si, 1.50-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.008% of S, 0.030-0.040% of Nb0.025-0.035% of Ti, less than or equal to 0.006% of N, 0.015-0.050% of Als0.015, and the balance of Fe and inevitable impurities.
The carbon equivalent CEV of the 590 MPa-grade axle housing steel for cold stamping is less than or equal to 0.38 percent, and the welding crack sensitivity index Pcm is less than or equal to 0.19 percent.
The yield strength of the 590 MPa-grade axle housing steel for cold stamping is more than or equal to 460MPa, the tensile strength is more than or equal to 590MPa, the elongation after fracture is more than or equal to 20%, the 180-degree bending test D is 2a, the half-size V-shaped notch impact value at minus 35 ℃ is more than or equal to 60J, and the vertical bending fatigue life of a part is more than or equal to 80 ten thousand times.
The preparation method of the 590 MPa-grade axle housing steel for cold stamping comprises the following steps: smelting the 590 MPa-grade cold stamping axle housing steel into a plate blank according to chemical components, wherein the chemical components comprise, by mass, 0.06-0.10% of C, 0.05-0.10% of Si, 1.50-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.008% of S, 0.030-0.040% of Nb0.025-0.035%, less than or equal to 0.006% of N, 0.015-0.050% of Als0.015%, and the balance of Fe and inevitable impurities; and heating, rough rolling, finish rolling, coiling and cooling the plate blank in sequence to obtain the 590 MPa-grade axle housing steel for cold stamping.
The heating temperature is controlled to be 1200-1240 ℃, and the heating time is controlled to be 190-400 min.
The rough rolling adopts 6-pass rolling, the reduction of each pass is controlled to be more than or equal to 19 percent, and the odd-pass full-length scale removal is carried out.
The finish rolling adopts 7-pass rolling, the start rolling temperature of the finish rolling is controlled to be less than or equal to 1050 ℃, the finish rolling temperature is controlled to be 850-890 ℃, and the reduction ratios of the three frames are respectively controlled to be more than or equal to 15 percent, more than or equal to 12 percent and more than or equal to 10 percent.
The coiling temperature was 550-590 ℃.
The cooling adopts a front-section cooling mode to carry out laminar cooling, and the cooling rate is 30-50 ℃/s.
The thickness of the rough-rolled plate blank is 42-44mm, and the thickness of the 590 MPa-level axle housing steel for cold stamping is 3-8 mm.
An axle housing is made of 590MPa grade axle housing steel for cold stamping.
The invention has the beneficial effects that: according to the 590 MPa-grade cold stamping axle housing steel, the designed chemical components achieve the effects of fine grain strengthening and precipitation strengthening by adding a certain amount of Nb and Ti elements, the strength of the product is ensured, the good forming performance of the product is realized, the carbon equivalent and the welding crack sensitivity index are reduced by controlling the contents of C, Si and Mn elements, and meanwhile, precipitates are formed by adding Ti elements in the welding process to inhibit the texture coarsening of a heat affected zone, so that the good welding performance of the product is realized, and the 590 MPa-grade cold stamping axle housing steel is suitable for a cold stamping forming process of an automobile axle housing.
The 590 MPa-grade axle housing steel for cold stamping, which is prepared by adopting the components and the preparation method thereof, has the carbon equivalent CEV of less than or equal to 0.38 percent, the weld crack sensitivity index Pcm of less than or equal to 0.19 percent, the yield strength of more than or equal to 460MPa, the tensile strength of more than or equal to 590MPa, the elongation after fracture of more than or equal to 20 percent, the 180-degree bending test D of 2a, the half-size V-shaped notch impact value at-35 ℃ of more than or equal to 60J, and the vertical bending fatigue life of parts of more than or equal to 80 ten thousand times. The components and the preparation method thereof designed by the invention realize high strength, good plasticity and bending property, excellent forming property, welding property and fatigue property of the product, the production method of the product is simple, the alloy cost is low, the comprehensive performance is excellent, and the cold stamping forming method is suitable for the cold stamping forming process of the automobile axle housing and has good application prospect.
Drawings
FIG. 1 shows a typical metallographic structure of an axle housing steel for 590MPa grade cold stamping prepared in example 1 of the present invention.
Detailed Description
The technical solution of the present invention can be specifically implemented as follows.
The 590 MPa-grade axle housing steel for cold stamping comprises the following chemical components in percentage by mass: 0.06-0.10% of C, 0.05-0.10% of Si, 1.50-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.008% of S, 0.030-0.040% of Nb0.025-0.035% of Ti, less than or equal to 0.006% of N, 0.015-0.050% of Als0.015, and the balance of Fe and inevitable impurities.
The reason for designing the components of the 590 MPa-grade axle housing steel for cold stamping is as follows:
c can be dissolved in a matrix to play a role in solid solution strengthening, can be combined with Nb and Ti to form carbide precipitation particles to play a role in fine grain strengthening and precipitation strengthening, and improves the carbon content; however, too high carbon content forms more coarse and coarse brittle carbide particles in steel, segregates at the center of the steel plate, and is unfavorable for plasticity, toughness and bending property formability, and meanwhile, too high carbon content increases welding carbon equivalent and welding crack sensitivity index, and is unfavorable for welding processing, so that the design of the invention is C0.06-0.10%.
Si has higher solid solubility in steel, thus being beneficial to refining the structure of a rust layer, reducing the overall corrosion rate of the steel and improving the toughness; however, since the content is too high, it is difficult to remove scale during rolling and also causes deterioration of weldability, the present invention is designed to have Si 0.05-0.10%.
Mn has a strong solid solution strengthening effect, can obviously reduce the phase transition temperature of steel and refine the microstructure of the steel; however, when the content of Mn is excessive, casting blank cracks are easy to generate in the continuous casting process, and simultaneously, the center component segregation of the steel plate can be caused, and the welding performance of the steel is reduced, so that the Mn content is designed to be 1.50-1.70%.
P and S elements can adversely affect the structure performance of the steel plate, the plasticity and low-temperature toughness of the steel can be obviously reduced when the content of P is too high, and the performance of the steel can be deteriorated due to sulfide inclusion formed by S, so that the P is less than or equal to 0.020% and the S is less than or equal to 0.008% in the design of the invention.
Nb can pin austenite grain boundaries to prevent grain growth, and finally, the grains are refined, and the impact toughness is improved; however, the yield strength is obviously increased by fine grain strengthening, the yield ratio is increased, the Nb content is too high, and the production cost is increased, so that the Nb0.030-0.040% is designed.
Ti (C, N) precipitates formed by Ti and C, N can effectively refine austenite grains, inhibit the coarsening of a coarse grain region in the welding process and generate a precipitation strengthening effect; however, the forming performance and the fatigue performance are reduced because micron-sized liquated TiN is easily formed due to the excessively high Ti or N content, the volume fraction of the liquated TiN at 1500 ℃ can be obtained according to the solid solubility product formula of the TiN in the liquid steel and the ideal chemical proportion of the TiN along with the change relation of the Ti content, so that the critical N content of the liquated TiN is 100ppm for the steel containing 0.030 percent of Ti, and the N content needs to be further reduced for further reducing the risk of producing the liquated TiN, therefore, the invention designs that the Ti content is 0.025-0.035 percent and the N content is less than or equal to 0.006 percent.
Al is added into steel to play a role in deoxidation, and the steel quality can be improved; however, the content of Al is too high, and the nitrogen oxide is easy to precipitate at the austenite grain boundary to cause the generation of casting blank cracks, so the Als0.015-0.050% is designed.
The carbon equivalent CEV of the 590 MPa-grade axle housing steel for cold stamping is less than or equal to 0.38%, the welding crack sensitivity index Pcm is less than or equal to 0.19%, the yield strength is greater than or equal to 460MPa, the tensile strength is greater than or equal to 590MPa, the elongation after fracture is greater than or equal to 20%, the 180-degree bending test D is 2a, the half-size V-shaped notch impact value at-35 ℃ is greater than or equal to 60J, and the vertical bending fatigue life of a part is greater than or equal to 80 ten thousand times.
The preparation method of the 590 MPa-grade axle housing steel for cold stamping comprises the following steps: smelting the 590 MPa-grade cold stamping axle housing steel into a plate blank according to chemical components, wherein the chemical components comprise, by mass, 0.06-0.10% of C, 0.05-0.10% of Si, 1.50-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.008% of S, 0.030-0.040% of Nb0.025-0.035%, less than or equal to 0.006% of N, 0.015-0.050% of Als0.015%, and the balance of Fe and inevitable impurities; and heating, rough rolling, finish rolling, coiling and cooling the plate blank in sequence to obtain the 590 MPa-grade axle housing steel for cold stamping.
In order to homogenize the cast structure and the composition segregation and to make the alloying elements solid-dissolve, but the problems of burning loss, overheating, overburning and the like can occur when the heating temperature is too high and the heating time is too long, it is preferable that the heating temperature is controlled to be 1200-1240 ℃ and the heating time is controlled to be 190-400 min.
In order to ensure austenite recrystallization, austenite grains are refined, and a mixed grain structure is prevented; in order to fully remove the iron scale and avoid the surface quality problem caused by pressing the iron scale; meanwhile, in order to reduce the load of finish rolling, the rough rolling is preferably performed by 6 passes, the reduction of each pass is controlled to be more than or equal to 19 percent, the odd passes are subjected to full-length descaling, and the thickness of the rough-rolled plate blank is 42-44 mm.
If the initial rolling temperature of finish rolling is too high, the deformation of the non-recrystallization region of austenite in the finish rolling process is insufficient, and the structure refinement is not facilitated; if the finish rolling temperature is too low, the difference between the finish rolling temperature and the initial rolling temperature is too large, so that the cooling speed in the finish rolling process is too high, the risk of rolling of a plurality of racks in a two-phase region after finish rolling exists, and the comprehensive performance of a product is poor; if the finish rolling temperature is too high, the deformation of the non-recrystallization zone is insufficient, and the final structure is not refined, so that the finish rolling is preferably performed by 7-pass rolling, the finish rolling initial temperature is controlled to be less than or equal to 1050 ℃, and the finish rolling temperature is controlled to be 850-890 ℃.
In order to flatten and elongate austenite grains which are rolled in a recrystallization zone and refined to a certain degree, increase the grain boundary area of austenite in unit volume, and simultaneously generate a large amount of deformation zones and high-density dislocation in grains, thereby improving the ferrite nucleation rate and obtaining fine grain structures after phase transformation, the rolling reduction rates of the three rear stands are preferably controlled to be respectively more than or equal to 15 percent, more than or equal to 12 percent and more than or equal to 10 percent.
If the coiling temperature is too low, the cooling rate during laminar cooling is too high to cause abnormal structure generation, and the coiling temperature is too high to cause coarse grains to cause deterioration of the overall properties of the finished product, so that it is preferable that the coiling temperature is 550-.
In order to realize a larger supercooling degree so as to refine the final structure, simultaneously facilitate the precipitation of a fine dispersed second phase and enhance the fine grain strengthening and precipitation strengthening effects, it is preferable that the cooling adopts a front-stage cooling mode to carry out laminar cooling, and the cooling rate is 30-50 ℃/s.
The thickness of the 590 MPa-level axle housing steel for cold stamping is 3-8 mm.
An axle housing is made of 590MPa grade axle housing steel for cold stamping.
The technical solution and effects of the present invention will be further described below by way of practical examples.
Examples
The invention provides a group of examples adopting the design components and the preparation method of the invention, and provides two groups of comparative examples. The chemical compositions of example 1 and comparative examples 1-2 are shown in table 1.
TABLE 1 chemical composition/% of examples and comparative examples
The specific preparation method of example 1 and comparative examples 1-2 is as follows:
example 1: smelting according to data in the table 1 to obtain a plate blank, and processing the plate blank, wherein the method specifically comprises the following steps: heating at 1210 deg.C for 210 min; then, 6-pass rough rolling is carried out, the pass reduction is more than or equal to 19 percent, odd-pass full-length scale removal is carried out, and the thickness of an intermediate blank is 43 mm; then, carrying out 7-pass finish rolling, wherein the reduction rates of the last three stands are respectively 17%, 13% and 10%, the start rolling temperature of the finish rolling is 1020 ℃, the finish rolling temperature is 860 ℃ and the coiling temperature is 565 ℃; and carrying out laminar cooling after rolling, wherein a front-section cooling mode is adopted, and the cooling rate is 40 ℃/s.
FIG. 1 is a typical metallographic structure diagram of an axle housing steel for 590MPa grade cold stamping prepared in example 1, and it can be seen from the diagram that: the metallographic structure is ferrite and pearlite, the structure is uniform and fine, the comprehensive performance of the product is improved, and the matching performance of the controlled rolling and controlled cooling process is good.
Comparative example 1: smelting according to the data in the table 1 to obtain a plate blank, adopting an RH process and carrying out Si-Ca treatment in the smelting process, controlling the continuous casting drawing speed to be 1.4m/min and the continuous casting water amount to be 4678L/min, and putting into electromagnetic stirring; and then processing the obtained plate blank, specifically: the heating temperature is 1205 ℃, the finish rolling temperature is 850 ℃, the coiling temperature is 595 ℃, laminar cooling is carried out after rolling, front-stage cooling is adopted, and indirect drawing type cooling is adopted, and the water cooling speed is 100 ℃/s.
Comparative example 2: smelting according to the data in the table 1 to obtain a plate blank, and processing the smelted plate blank, wherein the method specifically comprises the following steps: the initial rolling temperature of rough rolling is 1020 ℃, the initial rolling temperature of finish rolling is 945 ℃, the final rolling temperature is 890 ℃, the reduction amount in the finish rolling stage is more than or equal to 60 percent, cooling is not controlled after rolling, and air cooling is carried out to the room temperature.
The axle housing steel for cold stamping prepared in example 1 and comparative examples 1 and 2 were subjected to performance tests, and the test results of mechanical properties, bending properties and fatigue properties are shown in table 2, and the test results of impact properties are shown in table 3.
TABLE 2 mechanical, flexural and fatigue Properties of the examples and comparative examples
TABLE 3 impact properties of the examples and comparative examples
As can be seen from Table 2, example 1 has higher tensile strength and good bending properties, and has equivalent fatigue properties to comparative example 1 and slightly lower impact toughness than comparative example 2. However, in the comparative example 1, the contents of Mn and Nb are high, and Ti, N and O elements need to be strictly controlled, so that the smelting process is difficult and the cost is high; and in the comparative example 2, the contents of C, Si and Mn are high, the weldability of the material is reduced, and meanwhile, a high content of V element is added, so that the alloy cost is greatly increased.
As can be seen from Table 3, the 590MPa grade axle housing steel for cold stamping prepared in the example 1 of the invention has excellent impact property.
According to the embodiment and the comparative example, the 590 MPa-grade axle housing steel for cold stamping is developed, the high strength, the good plasticity and bending property, the excellent forming property, the excellent welding property and the excellent fatigue property of the product are realized through reasonable alloy components and production process design, the production method of the product is simple, the alloy cost is low, the comprehensive performance is excellent, and the 590 MPa-grade axle housing steel is suitable for the cold stamping forming process of the automobile axle housing and has good application prospect.
Claims (10)
- The axle housing steel for 1.590MPa grade cold stamping is characterized by comprising the following chemical components in percentage by mass: 0.06-0.10% of C, 0.05-0.10% of Si, 1.50-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.008% of S, 0.030-0.040% of Nb, 0.025-0.035% of Ti, less than or equal to 0.006% of N, 0.015-0.050% of Als, and the balance of Fe and inevitable impurities.
- 2. The 590MPa grade axle housing steel for cold stamping according to claim 1, wherein: the carbon equivalent CEV of the 590 MPa-grade axle housing steel for cold stamping is less than or equal to 0.38 percent, and the welding crack sensitivity index Pcm is less than or equal to 0.19 percent.
- 3. The 590MPa grade axle housing steel for cold stamping according to claim 1, wherein: the yield strength of the 590 MPa-grade axle housing steel for cold stamping is greater than or equal to 460MPa, the tensile strength is greater than or equal to 590MPa, the elongation after fracture is greater than or equal to 20%, the 180-degree bending test D is 2a, the half-size V-shaped notch impact value at-35 ℃ is greater than or equal to 60J, and the vertical bending fatigue life of a part is greater than or equal to 80 ten thousand times.
- The preparation method of the 4.590 MPa-level axle housing steel for cold stamping is characterized by comprising the following steps: smelting the 590 MPa-grade cold stamping axle housing steel into a plate blank according to chemical components, wherein the chemical components comprise, by mass, 0.06-0.10% of C, 0.05-0.10% of Si, 1.50-1.70% of Mn, less than or equal to 0.020% of P, less than or equal to 0.008% of S, 0.030-0.040% of Nb, 0.025-0.035% of Ti, less than or equal to 0.006% of N, 0.015-0.050% of Als, and the balance of Fe and inevitable impurities; and heating, rough rolling, finish rolling, coiling and cooling the plate blank in sequence to obtain the 590 MPa-grade axle housing steel for cold stamping.
- 5. The preparation method of the 590MPa grade axle housing steel for cold stamping according to claim 4, is characterized in that: the heating temperature is controlled to be 1200-1240 ℃, and the heating time is controlled to be 190-400 min.
- 6. The preparation method of the 590MPa grade axle housing steel for cold stamping according to claim 4, is characterized in that: the rough rolling adopts 6-pass rolling, the reduction of each pass is controlled to be more than or equal to 19 percent, and the odd-pass full-length scale removal is carried out.
- 7. The preparation method of the 590MPa grade axle housing steel for cold stamping according to claim 4, is characterized in that: the finish rolling adopts 7-pass rolling, the start rolling temperature of the finish rolling is controlled to be less than or equal to 1050 ℃, the finish rolling temperature is controlled to be 850-890 ℃, and the reduction ratios of the three frames are respectively controlled to be more than or equal to 15 percent, more than or equal to 12 percent and more than or equal to 10 percent.
- 8. The preparation method of the 590MPa grade axle housing steel for cold stamping according to claim 4, is characterized in that: the coiling temperature is 550-590 ℃.
- 9. The preparation method of the 590MPa grade axle housing steel for cold stamping according to claim 4, is characterized in that: the cooling adopts a front-section cooling mode to carry out laminar cooling, and the cooling rate is 30-50 ℃/s.
- 10. The preparation method of the 590MPa grade axle housing steel for cold stamping according to claim 4, is characterized in that: the thickness of the rough-rolled plate blank is 42-44mm, and the thickness of the 590 MPa-level axle housing steel for cold stamping is 3-8 mm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115637385A (en) * | 2022-11-01 | 2023-01-24 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength steel for automobile wheel rim and preparation method thereof |
| CN116145037A (en) * | 2023-02-20 | 2023-05-23 | 盐城永鑫机械有限公司 | High strength agricultural machinery axle housing |
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| CN116145037A (en) * | 2023-02-20 | 2023-05-23 | 盐城永鑫机械有限公司 | High strength agricultural machinery axle housing |
| CN116145037B (en) * | 2023-02-20 | 2024-01-23 | 盐城永鑫机械有限公司 | High strength agricultural machinery axle housing |
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