Method for manufacturing high-strength member of precipitation h

Details Method for manufacturing high-strength member of precipitation h Method for manufacturing high-strength member of precipitation h

1995-09-27

1998-05-05

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148608, C21D 800

Patent

active

057468451

ABSTRACT:
A high-strength member of precipitation hardening martensitic steel is manufactured through the steps of heating precipitation hardening martensitic stainless steel at an austenitizing temperature, performing the first plastic working at a temperature between 200.degree. C. and 700.degree. C. so as to leave a part of austenite as retained austenite at the time of cooling the steel at Ms point or below thereafter, cooling the steel at the temperature not higher than Ms point, performing the next plastic working at a temperature not higher than As point so as to transform the retained austenite into martensite, and performing age hardening treatment at a temperature between not lower than 370.degree. C. and lower than 480.degree. C.

REFERENCES:
patent: 4042421 (1977-08-01), Van Den Sype et al.

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