Title: Cold formable spring steel wire excellent in cold cutting capability and fatigue properties and manufacturing process thereof
Application Number: 200610164223 Application Date: 2006.12.05
Publication Number: 1986865 Publication Date: 2007.06.27
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C22C38/46;C22C38/48;C22C38/50;C21D8/00;C21D9/52;C21D11/00;B21B37/74
Applicant(s) Name: Kobe Steel Ltd.(jp) Address:
Inventor(s) Name: Yoshihara Nao
Attorney & Agent: wanghui min
Abstract:
    Disclosed is a cold formable spring steel wire excellent in cold cutting capability and fatigue properties, in which the steel wire satisfies given composition, has an average globular carbide particle size [[square root of](ab)]:1.0 mum or less with aspect ratio (a/b, a: major axis of carbide, b: minor axis of carbide) being 2 or less, a ratio (area %) of the globular carbide in the steel: (0.1 to 3)xamount (mass %) of C in the steel, an amount (mass %) of Cr in the globular carbide: [0.4xamount (mass %) of Cr in the steel] or less, hardenability factor (Dic): between 110 mm and 450 mm, and tensile stress of 2000 MPa or more.
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