Low-yield-ratio high-strength hot-rolled steel sheet and method

Details Low-yield-ratio high-strength hot-rolled steel sheet and method Low-yield-ratio high-strength hot-rolled steel sheet and method

1992-12-23

1994-05-17

Yee, Deborah

Metal treatment

Stock

Ferrous

148602, 148654, C22C 3802, C21D 800

Patent

active

053124936

ABSTRACT:
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.gtoreq.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.

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