CN112725689B - Coiled plate with tensile strength of 600MPa for automobile axle housing and preparation method of coiled plate - Google Patents
Coiled plate with tensile strength of 600MPa for automobile axle housing and preparation method of coiled plate Download PDFInfo
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- CN112725689B CN112725689B CN202011457839.XA CN202011457839A CN112725689B CN 112725689 B CN112725689 B CN 112725689B CN 202011457839 A CN202011457839 A CN 202011457839A CN 112725689 B CN112725689 B CN 112725689B
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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
- 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 a coiled plate for an automobile axle housing with 600 MPa-level tensile strength and a preparation method thereof, belonging to the technical field of high-strength steel production. The coiled plate for the automobile axle housing with the tensile strength of 600MPa comprises the following chemical components in percentage by mass: c: 0.15-0.17%, Si: 0.15-0.25%, Mn: 1.50-1.65%, P: less than or equal to 0.018 percent, less than or equal to 0.005 percent of S, Alt: 0.020 to 0.050%, Nb: 0.035 to 0.045%, and the balance of Fe and inevitable impurities. The coiled plate for the automobile axle housing with the tensile strength of 600MPa has the characteristics of good forming performance, low-temperature impact toughness, fatigue resistance and the like, and can be suitable for automobile bearing parts such as the automobile axle housing with good fatigue resistance requirements.
Description
Technical Field
The invention belongs to the technical field of high-strength steel production, and particularly relates to a coiled plate for an automobile axle housing with the tensile strength of 600MPa and a preparation method thereof, in particular to a coiled plate for an automobile axle housing with the tensile strength of 600MPa and good strength, formability, low-temperature toughness and fatigue performance and a preparation method thereof.
Background
Due to environmental pressure and resource shortage, light weight has become an important subject of sustainable development of the automobile industry, and light weight has been proved to be a key technical route of automobile energy conservation and emission reduction. The lightweight of the automobile is to reduce the preparation quality of the automobile as much as possible on the premise of ensuring the strength and the safety performance of the automobile, thereby improving the dynamic property of the automobile, reducing the fuel consumption and reducing the exhaust pollution. Experiments prove that if the weight of the whole automobile is reduced by 10%, the fuel efficiency can be improved by 6-8%, and the fuel consumption can be reduced by about 7%. In the special automobile industry, the high-strength steel plate can greatly improve the strength of the whole automobile, effectively reduce the plate thickness, remarkably reduce the weight of the whole automobile, improve the load, prolong the service life of the automobile and improve the carrying capacity of the automobile, and has incomparable advantages compared with the traditional common steel plate.
The axle housing is one of the main components of the automobile driving system, supports the frame and the weight of each assembly behind the frame in the using process, is an important bearing part, and bears large bending and expansion plastic deformation when the housing is subjected to stamping forming, and the stamped housing needs to be welded to form an axle, and simultaneously protects each component in a transmission system. The requirements of medium and heavy truck markets on various assemblies including a drive axle are correspondingly improved, and the steel for the automobile drive axle housing requires that the product has enough strength and rigidity, good cold bending and drawing formability and excellent welding performance.
King wisdom et al (king wisdom etc., 600MPa lightweight automobile axle housing is with the development of medium plate, steel rolling, 3 rd in 2017) promote the carbonitride to separate out through adding microalloy element Nb, V at the medium plate production line, utilize its precipitation strengthening effect, make the intensity of material obtain promoting, the tensile strength 600MPa level automobile axle housing of production is with hot rolling high strength steel sheet and is satisfied the user's requirement, but the low temperature impact toughness of-20 ℃ of the steel sheet of design is lower. Production practice and application of Song-Shaogong (Song-Shaogong, 60 kg-grade stamping axle housing steel 600QK, wide and thick plate, 4 th 2014) in a Ji steel medium and thick plate production line are developed by adding Nb, V and Ti microalloy elements to the 60 kg-grade stamping axle housing steel 600QK with the thickness of 12mm, the yield strength is 478-559 MPa and the tensile strength is 582-621 MPa under the component design, and the thickness reduction amount of the designed axle housing is limited due to low strength. The components of the steel for the automobile axle housing are designed according to the use characteristics of the steel for the automobile axle housing by the people who works on the engineering of the Zhang Aimei and the like (Zhang Aimei and the like, the development of a BQK580 steel plate for the hot-rolled axle housing, steel in Xinjiang, 3 rd 2017), Nb, V and Ti microalloy elements are added, and the steel is produced in an eight-steel 1750mm hot continuous rolling unit and passes through a controlled rolling and controlled cooling process, so that various properties of the material meet the technical requirements, but the steel plate which is designed and manufactured in a trial mode is low in-40 ℃ low-temperature impact toughness, and the cost is high due to the high content of the added microalloy elements.
Disclosure of Invention
Aiming at one or more problems in the prior art, the invention provides a coiled plate for an automobile axle housing with tensile strength of 600MPa, which comprises the following chemical components in percentage by mass: c: 0.15-0.17%, Si: 0.15-0.25%, Mn: 1.50-1.65%, P: less than or equal to 0.018 percent, less than or equal to 0.005 percent of S, Alt: 0.020 to 0.050%, Nb: 0.035 to 0.045%, and the balance of Fe and inevitable impurities.
The thickness of the coiled plate for the automobile axle housing with the tensile strength of 600MPa is more than or equal to 12 mm.
The mechanical property of the coiled plate for the automobile axle housing with the tensile strength of 600MPa meets the following requirements: the yield strength is more than or equal to 490MPa, the tensile strength is 610-720 MP, the elongation A is more than or equal to 17%, and the cold bending d is 0.5a, and the longitudinal impact energy at-40 ℃ is more than or equal to 160J.
The mechanical property of the coiled plate for the automobile axle housing with the tensile strength of 600MPa meets the following requirements: the yield strength is more than or equal to 550MPa, the tensile strength is 650-720 MP, the elongation A is more than or equal to 20%, and the cold bending d is 0.5a, and the longitudinal impact energy at minus 40 ℃ is more than or equal to 160J.
The invention also provides a preparation method of the coiled plate for the automobile axle housing with the tensile strength of 600MPa, which comprises the following steps: pretreating molten iron, converting, LF (ladle furnace), continuously casting by a casting machine, heating a continuous casting blank, rolling and cooling; wherein:
controlling the furnace time to be 180-270 min in the heating process of the continuous casting billet, and discharging the continuous casting billet at 1180 +/-20 ℃;
the rolling comprises rough rolling and finish rolling, wherein the rough rolling adopts a 2-stand rolling mill for rough rolling, the finish rolling adopts a 7-stand continuous variable crown rolling mill for finish rolling, and a two-stage controlled rolling process, namely rolling in an austenite recrystallization region and rolling in an austenite non-recrystallization region is adopted; the initial rolling temperature of finish rolling is more than or equal to 950 ℃, and the finish rolling temperature of finish rolling is 860-870 ℃;
and after the rolling is controlled, the steel plate enters a laminar cooling area, a front section cooling mode is adopted, and the coiling temperature is 560-590 ℃.
The preparation method of the coiled plate for the automobile axle housing with the tensile strength of 600MPa provided by the invention is based on the medium-carbon manganese steel, adopts the C-Si-Mn-Nb component design, adds the silicon element, adds the Nb element for ensuring the strength of the coiled plate, strictly controls P, S harmful elements, obtains the coiled plate for the automobile axle housing with the tensile strength of 600MPa, has the characteristics of good forming performance, low-temperature impact toughness, fatigue resistance and the like on the basis of ensuring the strength performance of the product, and can be suitable for automobile bearing parts such as the automobile axle housing with good fatigue resistance requirements. The embodiment result shows that the microstructure of the coiled plate for the automobile axle housing with the tensile strength of 600MPa is ferrite and pearlite, the grain size is about 11-12 grades, the mechanical property and the process property meet the requirements that the yield strength is more than or equal to 490MPa, the tensile strength is 610-720 MPa, the elongation A is more than or equal to 17 percent, and the cold bending d is 0.5a, and the coiled plate has good impact toughness at minus 40 ℃ (the longitudinal impact energy at minus 40 ℃ is more than or equal to 160J).
Drawings
FIG. 1 is a metallographic structure photograph of a coiled plate for an automobile axle housing with a tensile strength of 600MPa obtained in example 2;
FIG. 2 is a photograph of a cold-formed rolled plate for an automobile axle housing having a tensile strength of 600MPa obtained in example 2.
Detailed Description
The invention aims to provide a coiled plate for an automobile axle housing with tensile strength of 600MPa and good formability, low-temperature impact toughness and fatigue resistance and a preparation method thereof.
The coiled plate for the automobile axle housing with the tensile strength of 600MPa is prepared from the following chemical components in percentage by mass: c: 0.15-0.17%, Si: 0.15-0.25%, Mn: 1.50-1.65%, P: less than or equal to 0.018 percent, less than or equal to 0.005 percent of S, Alt: 0.020 to 0.050%, Nb: 0.035 to 0.045%, and the balance of Fe and inevitable impurities.
The preparation method of the coiled plate for the automobile axle housing with the tensile strength of 600MPa comprises the following processes: pretreating molten iron, converting, LF (ladle furnace), continuously casting by a casting machine, heating a continuous casting blank, rolling and cooling; wherein:
the first step is as follows: molten iron pretreatment-converter-LF furnace-casting machine
The steel-making process adds proper amount of Si and Mn elements and micro-alloy element Nb for ensuring the strength, thereby improving the strength, simultaneously keeping good stamping performance and welding performance and presenting good strength and plasticity balance. Meanwhile, the precise control of the smelting and continuous casting processes is further enhanced, the steel cleanliness is ensured, and the impurity-containing defects on the surface of the final product are prevented. The molten steel for the casting machine comprises the following components: 0.15-0.17%, Si: 0.15-0.25%, Mn: 1.50-1.65%, P: less than or equal to 0.018 percent, less than or equal to 0.005 percent of S, Alt: 0.020 to 0.050%, Nb: 0.035-0.045%.
The second step is that: heating of continuous cast slab
The heating process is controlled to be 180-270 min in furnace time, and the tapping temperature is 1180 +/-20 ℃.
The third step: rolling of
The rolling comprises rough rolling and finish rolling, wherein the rough rolling adopts a 2-stand rolling mill for rough rolling, the finish rolling adopts a 7-stand continuous variable crown (cvc) rolling mill for finish rolling, and a two-stage controlled rolling process, namely austenite recrystallization zone rolling and austenite non-recrystallization zone rolling is adopted. The initial rolling temperature of finish rolling is more than or equal to 950 ℃, and the finish rolling temperature of finish rolling is 860-870 ℃.
The fourth step: cooling down
And after the rolling is controlled, the steel plate enters a laminar cooling area, a front section cooling mode is adopted, and the coiling temperature is 560-590 ℃.
The present invention is described in more detail below with reference to examples. These examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
Carrying out desulfurization pretreatment on molten iron, adopting a top-bottom combined blown converter to carry out smelting to decarbonize and dephosphorize the molten iron to obtain molten steel, adding scrap steel into the converter, and enabling the tapping temperature of the converter to be more than or equal to 1620 ℃. And then, carrying out an LF refining process on the molten steel smelted by the converter, and adding alloys such as aluminum iron, ferrosilicon, ferromanganese, ferroniobium and the like according to the components of the molten steel to adjust the range of target components. And (4) carrying out Ca treatment after LF treatment is finished, and ensuring that the soft blowing time is more than 8min after Ca treatment. Smelting according to the chemical components shown in the table 1, and continuously casting a plate blank with the superheat degree of 25 ℃. And then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out. The heating temperature of the plate blank is 1170 ℃, the heating time is 180min, and the high-pressure water dephosphorization is carried out on the heated plate blank. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The initial rolling temperature of finish rolling is 1005 ℃, and the final rolling temperature of finish rolling is 860 ℃. The laminar cooling adopts front-section cooling, the cooling speed is 30 ℃/s, the coiling temperature is 560 ℃, and the thickness of a finished product is 12 mm.
Example 2
Carrying out desulfurization pretreatment on molten iron, adopting a top-bottom combined blown converter to carry out smelting to decarbonize and dephosphorize the molten iron to obtain molten steel, adding scrap steel into the converter, and enabling the tapping temperature of the converter to be more than or equal to 1620 ℃. And then, carrying out an LF refining process on the molten steel smelted by the converter, and adding alloys such as aluminum iron, ferrosilicon, ferromanganese, ferroniobium and the like according to the components of the molten steel to adjust the range of target components. And (4) carrying out Ca treatment after LF treatment is finished, and ensuring that the soft blowing time is more than 8min after Ca treatment. Smelting according to the chemical components shown in the table 1, and continuously casting a plate blank with the superheat degree of 25 ℃. And then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out. The heating temperature of the plate blank is 1180 ℃, the heating time is 220min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The initial rolling temperature of finish rolling is 1010 ℃, and the finish rolling temperature of finish rolling is 870 ℃. The laminar cooling adopts front-section cooling, the cooling speed is 30 ℃/s, the coiling temperature is 570 ℃, and the thickness of a finished product is 12 mm. FIG. 1 is a typical microstructure diagram of a steel strip produced in this example, from which it can be seen that the microstructure is ferrite and a small amount of pearlite with a grain size of about grade 12. FIG. 2 is a photograph of a cold-bending of the steel strip produced in this example, and it can be seen that the steel strip has good cold-bending formability.
Example 3
Carrying out desulfurization pretreatment on molten iron, adopting a top-bottom combined blown converter to carry out smelting to decarbonize and dephosphorize the molten iron to obtain molten steel, adding scrap steel into the converter, and enabling the tapping temperature of the converter to be more than or equal to 1620 ℃. And then, carrying out an LF refining process on the molten steel smelted by the converter, and adding alloys such as aluminum iron, ferrosilicon, ferromanganese, ferroniobium and the like according to the components of the molten steel to adjust the range of target components. And (4) carrying out Ca treatment after LF treatment is finished, and ensuring that the soft blowing time is more than 8min after Ca treatment. Smelting according to the chemical components shown in the table 1, and continuously casting a plate blank with the superheat degree of 25 ℃. And then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out. The heating temperature of the plate blank is 1185 ℃, the heating time is 270min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The initial rolling temperature of finish rolling is 1015 ℃, and the finish rolling temperature of finish rolling is 870 ℃. The laminar cooling adopts front-section cooling, the cooling speed is 28 ℃/s, the coiling temperature is 590 ℃, and the thickness of a finished product is 12 mm.
Comparative example 1
Carrying out desulfurization pretreatment on molten iron, adopting a top-bottom combined blown converter to carry out smelting to decarbonize and dephosphorize the molten iron to obtain molten steel, adding scrap steel into the converter, and enabling the tapping temperature of the converter to be more than or equal to 1620 ℃. And then, carrying out an LF refining process on the molten steel smelted by the converter, and adding alloys such as aluminum iron, ferrosilicon, ferromanganese, ferroniobium and the like according to the components of the molten steel to adjust the range of target components. And (4) carrying out Ca treatment after LF treatment is finished, and ensuring that the soft blowing time is more than 8min after Ca treatment. Smelting according to the chemical components shown in the table 1, and continuously casting a plate blank with the superheat degree of 25 ℃. And then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out. The heating temperature of the plate blank is 1180 ℃, the heating time is 220min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The initial rolling temperature of finish rolling is 1010 ℃, and the finish rolling temperature of finish rolling is 870 ℃. The laminar cooling adopts front-section cooling, the cooling speed is 30 ℃/s, the coiling temperature is 570 ℃, and the thickness of a finished product is 12 mm.
Comparative example 2
Carrying out desulfurization pretreatment on molten iron, adopting a top-bottom combined blown converter to carry out smelting to decarbonize and dephosphorize the molten iron to obtain molten steel, adding scrap steel into the converter, and enabling the tapping temperature of the converter to be more than or equal to 1620 ℃. And then, carrying out an LF refining process on the molten steel smelted by the converter, and adding alloys such as aluminum iron, ferrosilicon, ferromanganese, ferroniobium and the like according to the components of the molten steel to adjust the range of target components. And (4) carrying out Ca treatment after LF treatment is finished, and ensuring that the soft blowing time is more than 8min after Ca treatment. Smelting according to the chemical components shown in the table 1, and continuously casting a plate blank with the superheat degree of 25 ℃. And then slab cleaning, slow cooling and continuous casting billet quality inspection are carried out. The heating temperature of the plate blank is 1185 ℃, the heating time is 270min, and the heated plate blank is subjected to high-pressure water dephosphorization. The width is fixed by a width fixing press, 2 frames are adopted for rough rolling, and 7 frames are adopted for CVC finish rolling. The initial rolling temperature of finish rolling is 1015 ℃, and the finish rolling temperature of finish rolling is 870 ℃. The laminar cooling adopts front-section cooling, the cooling speed is 28 ℃/s, the coiling temperature is 590 ℃, and the thickness of a finished product is 12 mm.
Table 1: chemical Components (wt%) of examples 1 to 3 and comparative examples 1 to 2
| C | Si | Mn | P | S | Alt | Nb | |
| Example 1 | 0.150 | 0.25 | 1.65 | 0.013 | 0.003 | 0.020 | 0.045 |
| Example 2 | 0.160 | 0.17 | 1.53 | 0.016 | 0.002 | 0.032 | 0.037 |
| Example 3 | 0.170 | 0.15 | 1.50 | 0.018 | 0.002 | 0.050 | 0.035 |
| Comparative example 1 | 0.080 | 0.20 | 1.53 | 0.016 | 0.003 | 0.030 | 0.040 |
| Comparative example 2 | 0.085 | 0.45 | 1.55 | 0.014 | 0.002 | 0.032 | 0.037 |
Mechanical property tests were performed on the steel sheets of examples 1 to 3 and comparative examples 1 to 2, and the test results are shown in table 2.
Table 2: mechanical properties of Steel sheets of examples 1 to 3 and comparative examples 1 to 2
As can be seen from the data in tables 1 and 2, the rolled plate for the automobile axle housing with the tensile strength of 600MPa, which has excellent low-temperature toughness and fatigue resistance, is obtained through reasonable C-Si-Mn-Nb component design, the mechanical property and the technological property meet the requirements that the yield strength is more than or equal to 490MPa, the tensile strength is 610-720 MP, the elongation A is more than or equal to 17%, the cold bending d is 0.5a, and the longitudinal impact function at minus 40 ℃ is more than or equal to 160J.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The utility model provides a tensile strength 600MPa level coil board for automobile axle housing which characterized in that, the chemical composition of the coil board for the tensile strength 600MPa level automobile axle housing is by mass percent: c: 0.15-0.17%, Si: 0.15-0.25%, Mn: 1.50-1.65%, P: less than or equal to 0.018 percent, less than or equal to 0.005 percent of S, Alt: 0.020 to 0.050%, Nb: 0.035 to 0.045%, and the balance of Fe and inevitable impurities;
the mechanical property of the coiled plate for the automobile axle housing with the tensile strength of 600MPa meets the following requirements: the yield strength is more than or equal to 550MPa, the tensile strength is 650-720 MP, the elongation A is more than or equal to 20%, the cold bending d =0.5a, and the longitudinal impact energy at minus 40 ℃ is more than or equal to 160J;
the preparation method of the coiled plate for the automobile axle housing with the tensile strength of 600MPa comprises the following steps: pretreating molten iron, converting, LF (ladle furnace), continuously casting by a casting machine, heating a continuous casting blank, rolling and cooling; wherein:
controlling the furnace time to be 180-270 min in the heating process of the continuous casting billet, and discharging the continuous casting billet at 1180 +/-20 ℃;
the rolling comprises rough rolling and finish rolling, wherein the rough rolling adopts a 2-stand rolling mill for rough rolling, the finish rolling adopts a 7-stand continuous variable crown rolling mill for finish rolling, and a two-stage controlled rolling process, namely rolling in an austenite recrystallization region and rolling in an austenite non-recrystallization region is adopted; the initial rolling temperature of finish rolling is more than or equal to 950 ℃, and the finish rolling temperature of finish rolling is 860-870 ℃;
and after the rolling is controlled, the steel plate enters a laminar cooling area, a front section cooling mode is adopted, and the coiling temperature is 560-590 ℃.
2. The rolling plate for the automobile axle housing with the tensile strength of 600MPa as claimed in claim 1, wherein the thickness of the rolling plate for the automobile axle housing with the tensile strength of 600MPa is more than or equal to 12 mm.
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| JP2006009057A (en) * | 2004-06-23 | 2006-01-12 | Nisshin Steel Co Ltd | Method for producing high strength cold-rolled steel sheet excellent in bending and fatigue resistant characteristics |
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| CN110343958A (en) * | 2019-07-25 | 2019-10-18 | 包头钢铁（集团）有限责任公司 | A kind of tensile strength 500MPa grades of automobile axle housing roll bendings and preparation method thereof |
| CN110894583A (en) * | 2019-11-07 | 2020-03-20 | 包头钢铁（集团）有限责任公司 | 1030 MPa-grade steel plate for high-toughness hydraulic support and preparation method thereof |
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| US7981224B2 (en) * | 2003-12-18 | 2011-07-19 | Nippon Steel Corporation | Multi-phase steel sheet excellent in hole expandability and method of producing the same |
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|---|---|---|---|---|
| JP2006009057A (en) * | 2004-06-23 | 2006-01-12 | Nisshin Steel Co Ltd | Method for producing high strength cold-rolled steel sheet excellent in bending and fatigue resistant characteristics |
| CN109722597A (en) * | 2018-12-21 | 2019-05-07 | 山东钢铁股份有限公司 | One kind having good low temperature resistant toughness thin gauge high-strength steel sheet and its production method |
| CN110343958A (en) * | 2019-07-25 | 2019-10-18 | 包头钢铁（集团）有限责任公司 | A kind of tensile strength 500MPa grades of automobile axle housing roll bendings and preparation method thereof |
| CN110894583A (en) * | 2019-11-07 | 2020-03-20 | 包头钢铁（集团）有限责任公司 | 1030 MPa-grade steel plate for high-toughness hydraulic support and preparation method thereof |
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