High-strength steel for valve springs, process for producing the

Details High-strength steel for valve springs, process for producing the High-strength steel for valve springs, process for producing the

1987-01-20

1989-01-03

Yee, Deborah

Alloys or metallic compositions

Ferrous

Chromium containing, but less than 9 percent

75 55, 75 58, 148908, 148335, C22C 3834, C22C 3844

Patent

active

047956097

ABSTRACT:
A high-strength steel for valve springs, consisting of 0.50-0.70 wt. % of carbon, 1.50-2.50 wt. % of silicon, 0.50-1.20 wt. % of manganese, 1.50-2.50 wt. % of nickel, 0.50-1.00 wt. % of chromium, 0.20.0.50 wt. % of molybdenum, 0.15-0.25 wt. % of vanadium, and the balance being iron and inevitably included inclusions. Also disclosed is a process for producing such a high-strength steel, which includes a step of minimizing oxygen in a melt of the steel, so as to reduce the oxygen content of the steel to 15 ppm or less, and a step of adding calcium to the melt and thereby controlling the form of the inclusions. The process may further include a step of minimizing titanium and nitrogen in the melt, so as to reduce the titanium and nitrogen content of the steel to 50 ppm or less, and 60 ppm or less, respectively.

REFERENCES:
patent: 4544406 (1985-10-01), Yamamoto et al.
patent: 4650645 (1987-03-01), Kato et al.

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