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Method for improving stamping forming performance of graphitized steel plate

A stamping and graphitization technology, applied in the field of steel material processing, can solve the problems of long time, coarse ferrite grains, coarse ferrite structure, etc., and achieve the effect of improving stamping performance.

Active Publication Date: 2018-05-18
UNIV OF SCI & TECH BEIJING
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  • Claims
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Problems solved by technology

However, due to the long time required for the graphitization process, the ferrite structure in the steel plate is often coarse and uneven. Such structure characteristics make it difficult for the steel plate to have good stamping performance.
[0004] Therefore, in order to solve the problem of coarse and uneven ferrite grains existing in the existing graphitization treatment method, the present invention proposes to use the warm deformation technology to perform ferrite dynamic reconstruction on the graphitized steel plate after graphitization treatment. Warm rolling of crystallization to achieve refinement and homogenization of ferrite grains, provide a good preparation structure for subsequent stamping, and further improve its stamping performance

Method used

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Embodiment 1

[0013] In this embodiment, a graphitized steel plate with a thickness of 2.3mm and Fe content of 0.86%, Si content of 0.98%, Mn content of 0.36%, P content of 0.008%, S content of 0.015%, and the remaining content of Fe is selected. After 680 ℃, 10 hours isothermal, furnace cooled to room temperature after graphitization treatment, its structure is mainly composed of ferrite and graphite, but the ferrite grains are coarse and uneven. Put this steel plate in the heating furnace at room temperature, and after the graphitized steel plate is heated to 630°C, it will be out of the furnace, and then it will be warm rolled on a flat roll mill, and the reduction will be 0.3mm, that is, 13%. The rolling temperature should not be lower than 550°C; air-cool to room temperature after rolling.

[0014] Metallographic analysis and mechanical testing were carried out on the graphitized steel plate after the above treatment. The results showed that the ferrite grains observed in its structure...

Embodiment 2

[0016] In this embodiment, a 3.3 mm thick graphitized steel plate with a C content of 1.16%, a Si content of 1.38%, a Mn content of 0.42%, a P content of 0.009%, a S content of 0.008%, and the rest of Fe is selected. , Isothermal for 12 hours, after graphitization treatment after furnace cooling to room temperature, its structure is mainly composed of ferrite and graphite, and the ferrite grains are also coarse and uneven. Put the steel plate into the heating furnace at room temperature, and after the graphitized steel plate is heated to 660°C, it is taken out of the furnace, and then it is warm-rolled on the flat roll mill, and the reduction is 0.3mm, that is, 9.1%. The rolling temperature should not be lower than 550°C; air-cool to room temperature after rolling.

[0017] Metallographic analysis and mechanical testing were carried out on the graphitized steel plate after the above treatment. The results showed that the ferrite grains observed in its structure were uniform, a...

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Abstract

The invention discloses a method for improving stamping forming performance of a graphitized steel plate and belongs to the technical field of steel and iron material processing. The method is characterized in that warm deformation of ferrite dynamic recrystallization is conducted on the graphitized steel plate obtained after graphitization treatment through a warm deformation technology; and thestamping forming performance of the graphitized steel plate is improved by controlling refining and homogenization of ferrite dynamic crystalline grains. The method comprises the specific steps that the graphitized steel plate obtained after graphitization treatment is heated to 550-710 DEG C; after temperature equalization is achieved, flat roll rolling with the rolling reduction being 8-15% is conducted; and after rolling, the graphitized steel plate is air-cooled to the room temperature. According to the graphitized steel plate treated through the method, the ferrite crystalline grains arerefined and homogenized; the stamping forming performance is good; the yield ratio is less than or equal to 0.56; the strain hardening index is greater than or equal to 0.25; and the plane anisotropism is less than or equal to 0.15.

Description

technical field [0001] The invention relates to a method for improving the stamping performance of a graphitized steel plate, which belongs to the technical field of steel material processing. Background technique [0002] The preparation process of graphitized steel plate mainly includes processes such as steelmaking, casting, hot rolling or cold rolling, and graphitization treatment. Among them, after the graphitization treatment, the steel plate exhibits high stamping performance, has a low yield ratio, and can be softened to the same level as low-carbon steel. [0003] The structure of the graphitized steel plate is mainly composed of ferrite + graphite. However, due to the longer time required for the graphitization process, the ferrite structure in the steel plate is often coarse and uneven. Such structure characteristics make it difficult for the steel plate to have good stamping performance. [0004] Therefore, in order to solve the problem of coarse and uneven fer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/04C22C38/02C22C38/04
CPCC21D8/0431C21D8/0447C21D2211/005C21D2211/006C22C38/02C22C38/04
Inventor 张永军张鹏程王九花于文杰韩静涛
Owner UNIV OF SCI & TECH BEIJING
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