US Patent:
20170016087, Jan 19, 2017
Inventors:
- West Chester OH, US
George A. Paraskos - Mason OH, US
International Classification:
C21D 9/52
C21D 1/42
C21D 8/02
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.