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Steel sheet for hot pressing and production method therefor, and hot press member and production method therefor

A manufacturing method and hot stamping technology, which are applied in the field of hot stamping steel sheets and their manufacturing, as well as hot stamping components and their manufacturing fields, can solve the problems of difficulty in forming, reduced formability, and poor formability.

Pending Publication Date: 2018-11-23
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in general, as the strength of the steel sheet increases, the formability decreases. Therefore, in the manufacture of automotive parts that use high-strength steel sheets as raw materials, problems such as difficulty in forming or poor formability occur.

Method used

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  • Steel sheet for hot pressing and production method therefor, and hot press member and production method therefor
  • Steel sheet for hot pressing and production method therefor, and hot press member and production method therefor
  • Steel sheet for hot pressing and production method therefor, and hot press member and production method therefor

Examples

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Embodiment

[0202] Molten steel having the composition shown in Table 1 and Table 4 (the balance being Fe and unavoidable impurities) was smelted in a small vacuum melting furnace to produce a billet. The steel billet was heated to 1250° C., and hot rolling including rough rolling and finish rolling was further performed to obtain a hot-rolled steel sheet. The hot rolling conditions were set to finish rolling entrance temperature: 1100°C, finish rolling exit side temperature: 850°C, and the cumulative rolling reduction in the temperature range of 950°C or higher was set to the values ​​shown in Table 2 and Table 5. In addition, after the hot rolling, the average cooling rate in the temperature range of 800°C to 650°C was set to 15°C / sec for cooling, and the coiling temperature was set to 650°C for coiling.

[0203] The obtained hot-rolled steel sheet was pickled and cold-rolled at a rolling reduction of 54% to obtain a cold-rolled steel sheet (sheet thickness: 1.6 mm). Next, heat to the ...

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Abstract

Provided is a steel sheet for hot pressing, which has a prescribed component composition, and which is configured to have a steel structure that includes ferrite and cementite such that Mn theta / Mn alpha is not lower than 1.4, when the Mn concentrations of the ferrite and the cementite are defined as Mn theta and Mn alpha, respectively.

Description

technical field [0001] The present invention relates to a steel sheet for hot stamping and a method for manufacturing the same, and a hot stamped member and method for manufacturing the same. It should be noted that a hot stamped member refers to a stamped member formed by forming a steel plate by hot stamping. Background technique [0002] In recent years, from the viewpoint of protecting the global environment, it has been strongly desired to improve the fuel efficiency of automobiles. Therefore, weight reduction of automobile bodies is required. Therefore, in order not to impair safety even if an automobile member is made thinner, it is required to increase the strength of a steel plate that is a raw material of the automobile member. [0003] However, in general, as the strength of the steel sheet increases, the formability decreases. Therefore, in the manufacture of automotive components using high-strength steel sheets as raw materials, problems such as difficulty in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/58C21D1/18C21D9/00C21D9/46C23C2/06C23C2/12
CPCC23C2/06C23C2/12C22C38/06C23C2/02C23C2/40C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/38C22C38/60C21D6/005C21D8/021C21D8/0268C21D1/26C21D9/46B32B15/01C21D6/008C21D8/0205C21D8/0226C21D8/0236C21D2211/003C21D2211/005C23C2/024C23C2/0224C21D8/0247
Inventor 中川功一玉井良清
Owner JFE STEEL CORP