High-steel galvanized steel sheet and method for manufacturing the same

US9255318B2 · kind B2 · utility

Assignee

• JFE Steel Corporation · JP

Inventors

• Yoshihiko Ono · Tokyo, JP
• Kenji Takahashi · Kaisei, JP
• Kaneharu Okuda · Chiba, JP
• Shoichiro Taira · Fukuyama, JP
• Michitaka Sakurai · Tokyo, JP
• Yusuke Fushiwaki · Fukuyama, JP

Key dates

• Filing date: Jun 25, 2010
• Grant date: Feb 9, 2016
• Expiry date: Mar 13, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C2/29
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high-strength galvanized steel sheet has a low YP, good stretch flangeability, and excellent corrosion resistance and contains, on a percent by mass basis, more than 0.015% to less than 0.10% of C, 0.5% or less of Si, 1.0% to 1.9% of Mn, 0.015% to 0.050% of P, 0.03% or less of S, 0.01% to 0.5% of sol. Al, 0.005% or less of N, less than 0.40% of Cr, 0.005% or less of B, less than 0.15% of Mo, 0.4% or less of V, and less than 0.020% of Ti, in which 2.2≦[Mneq]≦3.1 and [% Mn]+3.3[% Mo]≦1.9, and [% Mn]+3.3[% Mo])/(1.3[% Cr]+8[% P]+150B*)<3.5 are satisfied.