High-strength steel sheet having excellent room-temperature formability and warm formability, and warm forming method thereof

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United States of America Patent

PATENT NO 9657381
APP PUB NO 20140271331A1
SERIAL NO

14238599

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Abstract

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This high-strength steel plate has a component composition including, by mass %, C: 0.02-0.3%, Si: 1-3%, Mn: 1.8-3%, P: 0.1% or less, S: 0.01% or less, Al: 0.001-0.1%, N: 0.002-0.03%, the rest consisting of iron and impurities. Said steel plate has a microstructure including, in terms of area ratio relative to the entire microstructure, each of the following phases: bainitic ferrite: 50-85%; retained γ: 3% or greater; martensite+the aforementioned retained γ: 10-45%; and ferrite: 5-40%. The C concentration (CγR) in the aforementioned retained austenite is 0.3-1.2 mass %, part or all of the N in the aforementioned component composition is solid solution N, and the amount of said solid solution N is 30-100 ppm.

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Patent Owner(s)

  • KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.);KOBE STEEL, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Asai, Tatsuya Kakogawa, JP 87 468
Hata, Hideo Kobe, JP 75 821
Kakiuchi, Elijah Kobe, JP 10 37
Mizuta, Naoki Kakogawa, JP 15 69
Murakami, Toshio Kobe, JP 96 1022

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