High strength bolt and method of producing same

Details High strength bolt and method of producing same High strength bolt and method of producing same

1984-08-27

1986-01-07

Stallard, Wayland

Metal treatment

Compositions

Heat treating

C21D 120

Patent

active

045632227

ABSTRACT:
A high strength bolt having a as-formed structure and a method of manufacturing the high strength bolt which method comprises the steps of: heating a steel alloy containing 0.15 to 0.3 wt % C and 1 to 3 wt % Mn to a temperature not lower than Ac.sub.3 transformation point; subjecting the steel alloy to isothermal transformation at 450.degree. to 580.degree. C.; subjecting, after cooling, the steel alloy to cold wire drawing at a reduction rate not larger than 40%; and bolt forming the steel. A cold wire drawing at a reduction rate not larger than 40% may be carried out before the above-mentioned isothermal transformation step.

REFERENCES:
patent: 3340102 (1967-09-01), Kulin et al.
patent: 3528088 (1970-09-01), Seghezzi et al.
patent: 3532560 (1970-10-01), Tomioka et al.
patent: 3877281 (1975-04-01), Shimizu et al.
patent: 4088511 (1978-05-01), Rowney

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