Process for producing steel for valve springs

Details Process for producing steel for valve springs Process for producing steel for valve springs

1988-06-02

1989-03-07

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 46, 75 511, 75 53, 75 58, 75 593, C21C 710

Patent

active

048102873

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 includes 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: 3206301 (1965-09-01), Daubersy
patent: 3467167 (1969-09-01), Mahin
patent: 4702767 (1987-10-01), Takata

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