Title:
MANUFACTURE OF HIGH TENSILE STRENGTH STEEL PRODUCT HAVING HIGH UNIFORM ELONGATION AND LOW YIELD RATIO
Document Type and Number:
Japanese Patent JPH10298664
Kind Code:
A
Abstract:
To provide a method of manufacturing a PC steel product excellent in spot weldability.
A billet or wire bar of a steel, having a composition consisting of, by weight, 0.1-0.4% C, 0.5-2.5% Si, 0.3-2.0% Mn, ≤0.03% P, ≤0.02% S, and the balance Fe with inevitable impurities, is heated to the austenite region and rolled into wire rod or steel wire. Immediately after the above rolling, the wire rod or steel wire is cooled rapidly down to 300 to 500°C and held isothermally in the above temp. region for 5 to 150 sec, followed by rapid cooling without delay. The resultant steel product has a dual-phase structure consisting of martensite of ≤25 μm old austenite grain size, bainite, and ≥2% retained austenite.
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Inventors:
ISHIKAWA HAJIME
YOSHIE ATSUHIKO
YOSHIE ATSUHIKO
Application Number:
JP10645197A
Publication Date:
November 10, 1998
Filing Date:
April 23, 1997
Export Citation:
Assignee:
NIPPON STEEL CORP
International Classes:
C21D9/52; C22C38/00; C22C38/04; C22C38/58; (IPC1-7): C21D9/52
Attorney, Agent or Firm:
Kazuo Ozeki
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