STEEL SHEET WITH HIGH TENSILE STRENGTH AND SUPERIOR DUCTILITY AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2011/122237

A1

Disclosed is a steel sheet with high tensile strength and superior ductility having tensile strength of 700 - 900 MPa and capable of avoiding abrupt failure during press molding and method for producing the same. The steel sheet with high tensile strength and superior ductility is characterized by having a composition containing 0.5 - 1.5% C, 0.1% or less Si, 10 - 25% Mn, 0.1% or less P, 0.05% or less S, 0.1% or less Al, 3.0 - 8.0% Ni, 0.1% or less Mo, and 0.01% or less N (% by mass), with the remainder being Fe and unavoidable impurities and by having recrystallized austenite particles with an average particle diameter of 5 - 30 µm or, further, a microstructure formed from another structure with an areal proportion of 1% or less.

KOBAYASHI, Takashi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
小林　崇 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)
FUNAKAWA, Yoshimasa (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)

JP2011/055007

October 06, 2011

February 25, 2011

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JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, JP)
ＪＦＥスチール株式会社 (〒11 東京都千代田区内幸町二丁目２番３号 Tokyo, 〒1000011, JP)
KOBAYASHI, Takashi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
小林　崇 (〒11 東京都千代田区内幸町二丁目２番３号ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)

C22C38/00; B21B3/00; C21D9/46; C22C38/12

OCHIAI, Kenichiro (JFE Techno-Research Corporation 7th Floor, Yanagiya Building, 1-10, Nihonbashi 2-chome, Chuo-k, Tokyo 27, 〒1030027, JP)

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