High-strength steel sheet and the method for production therefor

US9267193B2 · kind B2 · utility

Assignee

• HONDA MOTOR CO., LTD. · JP

Inventors

• Masashi Ishii · Saitama, JP
• Sven Leonhardt · Offenbach am Main, DE
• Yoshitaka Okitsu · Wako, JP
• Klaus Brokmeier · Duisburg, DE
• Georg Frommeyer · Erkrath, DE

Key dates

• Filing date: Nov 5, 2008
• Grant date: Feb 23, 2016
• Expiry date: Jan 12, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/001
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high-strength steel sheet comprises, by weight, not less than 0.25% and not more than 0.5% of C, not less than 4% and not more than 14% of Mn, not less than 6.5% and not more than 9.5% of Cr, and not less than 0.3% and not more than 3% of Si. The high-strength steel sheet satisfies formulas 1 and 2, formula (1) being 12≦2.0Si+5.5Al+Cr+1.5Mo≦25 and formula (2) being 13≦30C+0.5Mn+0.3Cu+Ni+25N≦17, and mainly consists of austenite, and the high-strength steel sheet has yield strength of not less than 1000 MPa and total elongation of not less than 20%. In formulas 1 and 2, each element in the above formulas indicates the content, in weight %, of the element.