Title:
HIGH STRENGTH HOT-ROLLED STEEL SHEET AND PRODUCTION THEREOF
Document Type and Number:
Japanese Patent JPH04272155
Kind Code:
A
Abstract:
PURPOSE: To relieve rolling load at the time of hot finish rolling and to obtain a hot-rolled sheet having a bainite-based structure, ≥80kgf/mm2 tensile strength and very small anisotropy of stretch flanging property.
CONSTITUTION: A steel slab chiefly contg., by weight, 0.08-0.20% C, 1.50-3.50% Mn, 0.50-1.50% Cr and 0.01-0.10% Al is hot-rolled at a finishing temp. between the Ar3 point and the Ar3 point +70°C. Within 6sec after this hot rolling, cooling is started at a proper cooling rate and coiling is carried out at a proper coiling temp. to produce a hot-rolled steel sheet.
Inventors:
MASUI SUSUMU
SAKATA TAKASHI
MORITA MASAHIKO
KATO TOSHIYUKI
SAKATA TAKASHI
MORITA MASAHIKO
KATO TOSHIYUKI
Application Number:
JP5558091A
Publication Date:
September 28, 1992
Filing Date:
February 28, 1991
Export Citation:
Assignee:
KAWASAKI STEEL CO
International Classes:
C21D8/02; C21D9/46; C22C38/00; C22C38/38; (IPC1-7): C21D8/02; C21D9/46; C22C38/00; C22C38/38
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)
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