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:
Oct. 20, 2020
Filed:
Jul. 15, 2016
Applicant:
AK Steel Properties, Inc., West Chester, OH (US);
Inventors:
Robert J. Comstock, Trenton, OH (US);
George A. Paraskos, Mason, OH (US);
Assignee:
AK Steel Properties, Inc., West Chester, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 9/52 (2006.01); C21D 8/02 (2006.01); C21D 9/60 (2006.01); C21D 1/42 (2006.01);
U.S. Cl.
CPC ...
C21D 9/52 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C21D 8/0278 (2013.01); C21D 8/0284 (2013.01); C21D 9/60 (2013.01); C21D 1/42 (2013.01); C21D 2211/003 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); Y02P 10/253 (2015.11);
Abstract
To improve the formability of dual phase steels, the martensite phase is tempered. It may form a ferrite-carbide structure. The tempering step occurs after martensite has been formed in the dual phase steel. The tempering step can occur in a box annealing step or it can be performed in a continuous fashion, such as on a continuous annealing, continuous tempering heat treating, or continuous coating line. The tempering step can further comprise a temper rolling on a temper mill after the heating step.