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:
Jun. 28, 2022
Filed:
Nov. 17, 2015
Arcelormittal, Luxembourg, LU;
Artem Arlazarov, Blenod les Pont-a-Mousson, FR;
Kangying Zhu, Metz, FR;
ARCELORMITTAL, Luxembourg, LU;
Abstract
A method for manufacturing a steel product includes providing a heated steel starting product at a temperature between 380° C. and 700° C., having a metastable fully austenitic structure, with a specified composition. Then the starting product is hot formed at a temperature between 700° C. and 380° C., with a cumulated strain εbetween 0.1 and 0.7, in at least one location of the heated steel starting product, to obtain a fully austenitic hot-formed steel product; quenched by cooling the product down, at a cooling rate VRsuperior to the critical martensitic cooling rate, to a quenching temperature QT lower than Ms in order to obtain a structure containing between 40% and 90% of martensite, the rest of the structure being austenite; then maintained at, or reheated up to a holding temperature PT between QT and 470° C. and holding the product at the temperature PT for a duration Pt between 5 s and 600 s.