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A kind of rolling plate for automobile axle housing with tensile strength of 600mpa and preparation method thereof

A tensile strength and automotive technology, which is applied in the field of coiled sheets for automobile axle housings with a tensile strength of 600 MPa and their preparation, can solve the problems of low impact toughness, high cost, and high content of microalloying elements, and achieves good impact toughness, good The effect of formability

Active Publication Date: 2022-04-19
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Wang Zhicong et al. (Wang Zhicong et al., Research and Development of Medium Plates for 600MPa Lightweight Automobile Axle Housings, Steel Rolling, No. 3, 2017) added microalloying elements Nb and V to promote the precipitation of carbonitrides in the medium and thick plate production line. The precipitation strengthening effect improves the strength of the material, and the hot-rolled high-strength steel plate for the automobile axle housing with a tensile strength of 600MPa meets the user's requirements, but the designed steel plate has low low-temperature impact toughness at -20°C
Song Zhenguan (Song Zhenguan, Production Practice and Application of 60kg Grade Stamped Axle Housing Steel 600QK, Wide and Heavy Plate, Issue 4, 2014) developed a 12mm thick 60kg grade stamping steel by adding Nb, V, Ti microalloying elements in the medium and heavy plate production line of Jinan Iron and Steel Co., Ltd. The axle housing steel is 600QK, the design yield strength of this composition is 478-559MPa, and the tensile strength is 582-621MPa. Due to the low strength, the thickness reduction of the designed axle housing is limited
Zhang Aimei et al. (Zhang Aimei et al., Research and development of BQK580 steel plate for hot-rolled axle housing, Xinjiang Iron and Steel, No. 3, 2017) designed the composition according to the use characteristics of steel for automobile axle housing, adding Nb, V, Ti microalloying elements , produced in the 1750mm hot continuous rolling mill of Bayi Iron and Steel Co., Ltd. through the controlled rolling and controlled cooling process, so that the various properties of the material meet the technical requirements, but the steel plate produced by design and trial production has low low-temperature impact toughness at -40°C, and the content of added microalloy elements higher cost will be higher

Method used

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  • A kind of rolling plate for automobile axle housing with tensile strength of 600mpa and preparation method thereof
  • A kind of rolling plate for automobile axle housing with tensile strength of 600mpa and preparation method thereof
  • A kind of rolling plate for automobile axle housing with tensile strength of 600mpa and preparation method thereof

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preparation example Construction

[0018] The preparation method of coiled plate for automobile axle housing with tensile strength of 600MPa includes the following processes: molten iron pretreatment—converter furnace—LF furnace—casting machine continuous casting—continuous casting slab heating—rolling—cooling; wherein:

[0019] The first step: molten iron pretreatment - converter - LF furnace - casting machine

[0020] Adding appropriate amount of Si, Mn elements and adding microalloying element Nb in order to ensure the strength in the steelmaking process can improve the strength while maintaining good stamping performance and welding performance, showing a good balance of strength and plasticity. At the same time, further strengthen the precise control of the smelting and continuous casting process to ensure the cleanliness of the steel and prevent inclusion defects on the surface of the final product. The composition of the molten steel for the casting machine is C: 0.15-0.17%, Si: 0.15-0.25%, Mn: 1.50-1.65...

Embodiment 1

[0029] The molten iron is subjected to desulfurization pretreatment, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. Scrap steel is added to the converter, and the tapping temperature of the converter is ≥1620°C. Then, the molten steel after converter smelting is subjected to the LF refining process, and alloys such as aluminum, ferrosilicon, ferromanganese, and ferroniobium are added according to the composition of the molten steel to adjust to the target composition range. Ca treatment is performed after LF treatment, and the soft blowing time is guaranteed to be greater than 8 minutes after Ca treatment. Smelting according to the chemical composition shown in Table 1, the superheat of slab continuous casting is 25°C. After that, slab cleaning, slow cooling, and continuous casting slab quality inspection are carried out. The heating temperature of the slab is 1170° C., and the heating time is 1...

Embodiment 2

[0031] The molten iron is subjected to desulfurization pretreatment, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. Scrap steel is added to the converter, and the tapping temperature of the converter is ≥1620°C. Then, the molten steel after converter smelting is subjected to the LF refining process, and alloys such as aluminum-iron, ferrosilicon, ferromanganese, and ferro-niobium are added according to the composition of the molten steel to adjust to the target composition range. Ca treatment is performed after LF treatment, and the soft blowing time is guaranteed to be greater than 8 minutes after Ca treatment. Smelting according to the chemical composition shown in Table 1, the superheat of slab continuous casting is 25°C. After that, slab cleaning, slow cooling, and continuous casting slab quality inspection are carried out. The heating temperature of the slab is 1180° C., and the heating tim...

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Abstract

The invention discloses a rolling plate for an automobile axle housing with a tensile strength of 600MPa and a preparation method thereof, belonging to the technical field of high-strength steel production. The chemical composition of the rolling plate for the automobile axle housing with a tensile strength of 600MPa grade provided by the present invention is calculated by mass percentage: C: 0.15-0.17%, Si: 0.15-0.25%, Mn: 1.50-1.65%, P: ≤0.018% , S≤0.005%, Alt: 0.020-0.050%, Nb: 0.035-0.045%, and the balance is Fe and unavoidable impurities. The coiled plate for automobile axle housing with tensile strength of 600MPa has good formability, low temperature impact toughness and fatigue resistance, and can be applied to automobile bearing parts such as automobile axle housing with good fatigue resistance requirements.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel production, and specifically relates to a rolling plate for automobile axle housings with a tensile strength of 600 MPa and a preparation method thereof, in particular to a tensile steel sheet with high strength, good formability, low-temperature toughness and fatigue performance A coil plate for automobile axle housings with a strength of 600 MPa and a preparation method thereof. Background technique [0002] Due to environmental pressure and shortage of resources, lightweight has become an important issue for the sustainable development of the automobile industry, and lightweight has been proven to be the key technical route of "energy saving and emission reduction" for automobiles. The lightweight of the car is to reduce the curb weight of the car as much as possible under the premise of ensuring the strength and safety performance of the car, so as to improve the power of the car, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/12C21D8/0226C21D2211/005C21D2211/009
Inventor 郭冬青黄利宿成刘德勤张秀飞
Owner BAOTOU IRON & STEEL GRP