High-strength steel sheet with excellent warm formability and process for manufacturing same

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United States of America Patent

PATENT NO 9890437
SERIAL NO

14377354

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Abstract

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This high-strength steel sheet contains, in mass %, 0.05 to 0.3% of C, 1 to 3% of Si, 0.5 to 3% of Mn, up to 0.1% (inclusive of 0%) of P, up to 0.01% (inclusive of 0%) of S, 0.001 to 0.1% of Al and 0.002 to 0.03% of N with the balance consisting of iron and unavoidable impurities, and has a microstructure which comprises, in area fraction relative to the microstructure, 40 to 85% of bainitic ferrite, 5 to 20% of retained austenite (γR), 10 to 50% (in total) of martensite and γR, and 5 to 40% of ferrite. The retained austenite (γR) has a C concentration of 0.5 to 1.0 mass %, while the quantity of γR present in the ferrite grains is 1% or more (in area fraction) relative to the microstructure.

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Patent Owner(s)

Patent OwnerAddress
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL LTD )2-4 WAKINOHAMA-KAIGANDORI 2-CHOME CHUO-KU KOBE-SHI HYOGO 651-8585

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Asai, Tatsuya Kakogawa, JP 74 331
Hata, Hideo Kobe, JP 69 683
Kajihara, Katsura Kobe, JP 33 137
Kakiuchi, Elijah Kobe, JP 10 19
Mizuta, Naoki Kakogawa, JP 13 31
Murakami, Toshio Kobe, JP 90 744

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