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公开(公告)号：US3615905A
公开(公告)日：1971-10-26
申请号：US3615905D
申请日：1969-06-30
Applicant: UDDEHOLMS AB
Inventor： OMSEN ARNE HARALDSSON , RING BERTIL
CPC classification number: C21D8/005
Abstract: The toughness of a martensitic, air-hardening steel is increased by a novel combination of steps practiced in the course of hot working a billet of the steel. After a partial reduction of the billet the billet is reheated to a temperature at which carbides are dissolved, whereupon the reheated billet is worked to final dimension under conditions to bring about a complete recrystallization in the workpiece, after which the reduced workpiece is cooled so rapidly that precipitation of carbides in the austenite grain boundaries is substantially avoided.
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