C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 7/13 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01)
Patent
CA 2086283
A low-yield-ratio high-strength hot-rolled steel sheet having the advantageous features of both conventional precipitation-strengthened steel and structure-strengthened steel and free from the drawbacks of these conventional steels, and a manufacturing method characterized in hot-rolling such a steel sheet. The steel sheet has an upper limit of C content of about 0.18 wt%, and the lower C content limit approximately satisfies C 0.05 + Ti/4 + Nb/8 in relationship with the content of Ti and/or Nb. The steel sheet also contains about 0.5 to 2.5 wt% Si and has a structure essentially formed of ferrite in which a carbide of Ti and/or Nb is precipitated, martensite and retained austenite.
Kato Toshiyuki
Masui Susumu
Morita Masahiko
Kawasaki Steel Corporation
Smart & Biggar
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