Title:
HOT-DIP PLATED HIGH-STRENGTH STEEL SHEET FOR PRESS WORKING WITH EXCELLENT LOW-TEMPERATURE TOUGHNESS AND CORROSION RESISTANCE, AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/099712
Kind Code:
A1
Abstract:
A hot-dip plated high-strength steel sheet for press working that comprises: a cold-rolled steel sheet which contains, in term of mass%, 0.0005-0.0050% C, up to 0.30% Si, 0.70-3.00% Mn, up to 0.05% P, 0.01-0.05% Ti, 0.01-0.04% Nb, 0.0005-0.0030% B, up to 0.01% S, 0.01-0.30% Al, and 0.0005-0.010% N, with the remainder comprising Fe and unavoidable impurities, and which has a value of TB* defined by equation (A) of 0.03-0.06, where [Ti] and [B] are Ti content (%) and B content (%), respectively, and in which [B] and [P] satisfy relationship (B), where [P] is P content (%); and a coating layer formed on the surfaces of the cold-rolled steel sheet by hot dipping. The high-strength steel sheet has a tensile strength of 340 MPa or higher but less than 540 MPa, is excellent in terms of secondary-working brittle resistance, seam-weld low-temperature toughness, and corrosion resistance, and is applicable to fuel tanks. TB* = (0.11-[Ti])/(ln([B]×10000)) (A) [P]≤10×[B]+0.03 (B)
Inventors:
SATO HIRONORI (JP)
Application Number:
PCT/JP2012/082845
Publication Date:
July 04, 2013
Filing Date:
December 18, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C13/00; C22C19/03; C22C38/14; C22C38/58; C23C2/02; C23C2/08; C23C28/02
Foreign References:
| JP2010047816A | 2010-03-04 | |||
| JP2006342412A | 2006-12-21 | |||
| JPH06287684A | 1994-10-11 | |||
| JPH0466621A | 1992-03-03 | |||
| JPS6347338A | 1988-02-29 |
Attorney, Agent or Firm:
EINSEL Felix-Reinhard et al. (JP)
アインゼル Felix-Reinhardt (JP)
アインゼル Felix-Reinhardt (JP)
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