Steel sheet for excellent panel appearance and dent resistance a

Details Steel sheet for excellent panel appearance and dent resistance a Steel sheet for excellent panel appearance and dent resistance a

1997-04-28

1998-12-29

Sheehan, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

148320, 420120, 420121, 420126, 420127, 420128, B32B 1501

Patent

active

058539034

ABSTRACT:
A cold-rolled steel sheet or a zinc or zinc alloy layer coated steel sheet containing 0.0010 to 0.01 wt % of C and having a steel composition containing one or two kinds of 0.005 to 0.08 wt % of Nb and 0.01 to 0.07 wt % of Ti in the ranges given by {(12/93)Nb+(12/48)Ti*} .gtoreq.0.0005, 0.ltoreq.C-{(12/93)Nb+(12/48)Ti*}.ltoreq.0.0015, and Ti*=Ti-{(48/32)S+(48/14)N } , in which a bake hardenability BH f the steel sheet at 170.degree. C..times.20 min after 2% tensile prestrain is 10 to 35 MPa and the BH (MPa) and a yield strength YP (MPa) of the steel sheet satisfy the ranges given by BH.gtoreq.exp(-0.115.multidot.YP+23.0) and 0.67.multidot.BH+160.ltoreq.YP.ltoreq.-0.8.multidot.BH+280.

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patent: 5133815 (1992-07-01), Hashimoto et al.
patent: 5656102 (1997-08-01), Taylor et al.
patent: 5690755 (1997-11-01), Yoshinaga et al.
Patent Abstracts of Japan, vol. 096, No. 002, 29, Feb, 1996 of JP 07 278654 (Nippon Steel Corp), 24, Oct. 1995.
Patent Abstracts of Japan, vol. 016, No. 479 (C-0992), 6, Oct. 1992 of JP 04 173925 (Nisshin Steel Co., LTD.) 22, Jun. 1992.
Database WPI, Section Ch, Week 9207, Derwent Publications Ltd., London, GB; Class M24, AN 92-054234 of JP 04 002 729 (Sumitomo Metal Ind. LTD.), 7, Jan. 1992.

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