HIGH FATIGUE-STRENGTH STEEL WIRE AND SPRING, AND PROCESSES FOR PRODUCING THESE

Title:

HIGH FATIGUE-STRENGTH STEEL WIRE AND SPRING, AND PROCESSES FOR PRODUCING THESE

Document Type and Number:

WIPO Patent Application WO/1999/024630

Kind Code:

A1

Abstract:

A steel wire which has a perlite structure containing 0.8-1.0 mass% carbon and 0.8-1.5 mass% silicon and has such a hardness distribution that a surface layer ranging from the surface to a depth of 100 $g(m)m from the surface has an average micro-Vickers hardness higher by at least 50 than that of the inner part. It is produced by shaving a steel wire having the above chemical composition and structure, patenting and drawing the shaven wire, annealing the drawn wire at 350 to 450 °C for strain removal, and then conducting shot peening. Thus, this steel wire can be obtained through drawing without conducting quenching or tempering, and is excellent in heat resistance and fatigue strength.

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Inventors:

KAWABE NOZOMU (JP)
MURAI TERUYUKI (JP)

Application Number:

PCT/JP1998/003623

Publication Date:

May 20, 1999

Filing Date:

August 13, 1998

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES (JP)
KAWABE NOZOMU (JP)
MURAI TERUYUKI (JP)

International Classes:

C21D7/06; C21D9/52; C22C38/00; B21F35/00; (IPC1-7): C22C38/00; C22C38/02; C21D9/52

Foreign References:

JPH05320827A	1993-12-07
JPS62260015A	1987-11-12
JPS57140833A	1982-08-31
JPS60194046A	1985-10-02

Other References: