Method of manufacturing high strength blank a bolt

Details Method of manufacturing high strength blank a bolt Method of manufacturing high strength blank a bolt

1988-04-08

1989-06-13

Yee, Deborah

Metal treatment

Compositions

Heat treating

148144, C21B 900

Patent

active

048389617

ABSTRACT:
A high strength bolt made of a steel having a specifically defined chemical composition, i.e., by weight C: 0.30-0.50%; Si: not more than 0.15%; Mn: not more than 0.40%; Cr: 0.30-1.50%; Mo: 0.10-0.70%; and V: 0.15-0.40%, the balance being Fe and inevitable impurities such as P, S, etc. in trace amount. The manufacturing method therefor is featured in a strictly controlled heat treatment in respect to the temperature range such as: hardening by quenching from 940.degree..+-.10.degree. C. and tempering 575.degree..+-.25.degree. C.

REFERENCES:
patent: 4319934 (1982-03-01), Henning
patent: 4584032 (1986-04-01), Isokawa et al.

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