Cold Rolled Steel Sheet

Abstract: Provided is a cold rolled steel sheet having a chemical composition constituted by, in mass%, 0.0005 to 0.0070% of C, 0.01 to 1.50% of Si, 0.05 to 1.50% of Mn, 0.001 to 0.150% of P, 0.0005 to 0.0100% of S, 0.005 to 0.100% of Al, 0.0010 to 0.0200% of N, 0.010 to 0.150% of Ti, 0.020 to 0.080% of Sn, and optional elements, the remainder being Fe and impurities. Said composition satisfies the expressions [Ti - 48/32 × S - 48/14 × N - 48/12 × C = -0.010] and [5.0 = 11 Si + 33 Mn + 21 Mo + 17 (Cr + Cu + Ni) - 30 Al = 50.0], where rL is 1.50 or more, rC is 1.50 or more, rD is 1.50 or more, mr is 1.70 or more, and ?r is in the range of -0.40 to 0.40.

Patent Information

Applicants

Inventors

Specification

Documents

Application Documents