The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 1992
Filed:
Mar. 03, 1992
Applicant:
Inventors:
Ashok K Khare, Warren, PA (US);
Michael Scott, Warren, PA (US);
Assignee:
National Forge Company, Irvine, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148638 ; 148641 ; 148663 ;
Abstract
An interrupted normalization heat treatment process for ferritic alloy steel that includes the steps of rapidly cooling at least the outer surfaces of the steel from a temperature above the Ac.sub.3, temperature to a temperature below the Ar.sub.1, temperature and during subsequent air cooling to room temperature reheating the outside surfaces of the ferritic alloy steel back above the Ar.sub.1, temperature by bleed back heat from the steel, tempering the air cooled workpiece, and forming an as interrupting normalized workpiece having substantially bainitic structures.