Patent ID: 9175370
Filing Date: 2015-11-03
Classification: C21D,C22C

Abstract:
1. A method for producing a part from steel, the method comprising the following steps preceding the finishing of the part providing it with its definitive shape: preparing a steel part having a steel composition comprising, in weight percentages, the following: shaping the steel part by at least one operation; softening tempering the steel part at 600 to 675° C. for 4 to 20 hours followed by cooling in air; treating the steel part with a solution heat treatment at 900 to 1,000° C. for at least 1 hour, followed by fast cooling the steel part in oil or air to avoid precipitation of intergranular carbides in an austenite matrix; and age hardening the steel part at 475 to 600° C., for 5 to 20 hours.