ULTRA HIGH STRENGTH STEEL COMPOSITION, PROCESS OF PRODUCTION OF ULTRAHIGH STRENGTH STEEL PRODUCT, AND THE PRODUCT OBTAINED

摘要

PROBLEM TO BE SOLVED: To provide an ultra high strength steel subjected to hot rolling, cold rolling and galvanising as well.;SOLUTION: According to the invention, a cold-rolled, possibly hot dip and galvanised steel sheet is produced with thickness lower than 1 mm, and tensile strength between 800 MPa and 1,600 MPa, while elongation is between 5 and 17%, depending on the process parameters. The composition is such that these high strength levels may be obtained, while maintaining good formability and optimal coating quality after galvanising. The invention is equally related to a hot rolled product of the same composition, with higher thickness (typically about 2 mm) and excellent coating quality after galvanising.;COPYRIGHT: (C)2011,JPO&INPIT