High strength spring steel and process for producing same

Details High strength spring steel and process for producing same High strength spring steel and process for producing same

1998-03-11

1999-04-27

Yee, Deborah

Metal treatment

Stock

Ferrous

148580, 148908, C22C 3822, C22C 3824, C21D 902, C21D 800

Patent

active

058977171

ABSTRACT:
The present invention provides, at low cost, a valve spring steel having a tensile strength as high as 210 to 240 kgf/mm.sup.2 after oil tempering. The high strength spring steel comprises, based on weight, 0.65 to 0.85% of C, 1.90 to 2.40% of Si, 0.50 to 1.00% of Mn, 0.70 to 1.30% of Cr, 0.10 to 0.30% of Mo, 0.20 to 0.50% of V, 0.01 to 0.04% of Nb and the balance Fe and unavoidable impurities and is subjected to heating at temperature of 1,050 to 1,250.degree. C. and then to rolling so that carbides in the steel have a size of up to 0.15 .mu.m in terms of equivalent circle. A valve spring having a tensile strength as high as 210 to 240 kgf/mm.sup.2 after oil tempering and stabilized quality can be produced while the material cost is greatly reduced by decreasing costly alloying components as much as possible.

REFERENCES:
patent: 4909866 (1990-03-01), Abe et al.
patent: 5665179 (1997-09-01), Izawa et al.

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