B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
B21C 1/00 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01)
Patent
CA 2204473
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*} ~ 0.0005, 0 ~ C- {(12/93)Nb + (12/48)Ti*} ~ 0.0015, and Ti* = Ti- {(48/32)S+(48/14)N } , in which a bake hardenability BH f the steel sheet at 170 °C x 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~exp(-0.115 . YP+23.0) and 0.67 . BH+160~YP~-0.8 . BH+280.
Hosoya Yoshihiro
Kitano Fusato
Nagataki Yasunobu
Jfe Steel Corporation
Nkk Corporation
Ridout & Maybee Llp
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