HOT PRESS-FORMING METHOD FOR STEEL SHEETS, HOT PRESS-FORMING DEVICE FOR STEEL SHEETS, AND STEEL FORMED MEMBER

WIPO Patent Application WO/2010/150683

A1

Before hot press-forming a flat plated steel sheet (K) that has been uniformly heated to a temperature equal to or greater than an A1 transformation point, a partial rapid cooling stage (11) rapidly cools a prescribed region of the plated steel sheet (K) to a temperature equal to or less than the martensite start (Ms) temperature, and then the rapidly cooled region of the plated steel sheet (K) is reheated to a temperature greater than the martensite start (Ms) temperature. After the plated steel sheet (K) is reheated, a forming/rapid-cooling stage (13) simultaneously forms the plated steel sheet (K) and rapidly cools same to a temperature equal to or less than the martensite finish (Mf) temperature.

ISHIMORI, Yuichi (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
石森　裕一 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)
FUKUCHI, Hiroshi (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)

JP2010/060127

December 29, 2010

June 15, 2010

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NIPPON STEEL CORPORATION (6-1 MARUNOUCHI 2-CHOME, CHIYODA-KU Tokyo, 71, 〒1008071, JP)
新日本製鐵株式会社 (〒71 東京都千代田区丸の内二丁目６番１号 Tokyo, 〒1008071, JP)
ISHIMORI, Yuichi (6-1 MARUNOUCHI 2-CHOME, CHIYODA-K, Tokyo 71, 〒1008071, JP)
石森　裕一 (〒71 東京都千代田区丸の内二丁目６番１号　新日本製鐵株式会社内 Tokyo, 〒1008071, JP)

B21D22/20; B21D24/00

KOKUBUN, Takayoshi (5th Floor, NBF Ikebukuro City Building 17-8, Higashi-Ikebukuro 1-chome, Toshima-k, Tokyo 13, 〒1700013, JP)

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