公开(公告)号：US20190276910A1

公开(公告)日：2019-09-12

申请号：US16302988

申请日：2017-05-23

Applicant: ARCELORMITTAL

Inventor： Jean-Christophe HELL ,  Nicolas CHARBONNIER ,  Thierry IUNG ,  Blandine REMY

IPC: C21D9/46 ,  C21D8/02 ,  C22C38/02 ,  C22C38/58 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46

Abstract: A method for manufacturing a recovered steel sheet having an austenitic matrix presenting at least one mechanical property (M) equal or above a target value Mtarget is provided. The method includes a calibrating process involving heat on at least 2 samples of the steel, corresponding to Pareq values P, submitting said samples to X-ray diffraction so as to obtain spectrums including a main peak whose width at mid height FWHM is being measured, measuring a mechanical property (M) of said samples, measuring a recovery or recrystallization state of each sample, drawing a curve of M as a function of FWMH in a domain where the samples are recovered from 0 to 100%, but not recrystallized. The method further includes calculating a FWHMtarget corresponding to a target mechanical property Mtarget, determining a pareq value Ptarget of the heat treatment to perform to reach Mtarget and selecting a time ttarget and a temperature T°target corresponding to the Ptarget value. The method further includes feeding a recrystallized steel sheet having a Mrecrystallization, cold-rolling the recrystallized steel sheet in order to obtain a steel sheet having a Mcold-roll and annealing the cold rolled steel sheet at a temperature T°target during a time ttarget.

公开(公告)号：US20190218638A1

公开(公告)日：2019-07-18

申请号：US16302982

申请日：2017-05-18

Applicant: ARCELORMITTAL

Inventor： Nicolas CHARBONNIER ,  Gerard PETITGAND ,  Sebastien ALLAIN ,  Marie-Christine THEYSSIER

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/38 ,  C22C38/24 ,  C22C38/20 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C23C2/02 ,  C23C2/06 ,  C23C2/40 ,  C23F17/00 ,  B32B15/01

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D8/0278 ,  C21D8/0468 ,  C21D2211/001 ,  C21D2211/004 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/16 ,  C22C38/20 ,  C22C38/24 ,  C22C38/38 ,  C23C2/02 ,  C23C2/06 ,  C23C2/12 ,  C23C2/40 ,  C23F17/00

Abstract: A method for the manufacture of a TWIP steel is provided including: (A) feeding of a slab comprising by weight: 0.5