公开(公告)号：US20220316021A1

公开(公告)日：2022-10-06

申请号：US17596676

申请日：2020-06-11

Applicant: TATA STEEL IJMUIDEN B.V.

Inventor： Shangping CHEN ,  Richard MOSTERT ,  Maxim Peter AARNTS ,  Stefanus Matheus Cornelis VAN BOHEMEN

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C23C2/06 ,  C23C2/40

Abstract: A method of a heat treating a cold rolled steel strip includes the steps of soaking a cold rolled steel strip above (Ac3−20) for a certain soaking duration thereby obtaining a cold rolled steel strip having an austenitic microstructure; cooling the soaked steel strip to below Ms; heating and heat treating the cooled strip in the temperature range of Bs-Ms; and cooling the heat treated strip to ambient temperature.

公开(公告)号：US20220316025A1

公开(公告)日：2022-10-06

申请号：US17596682

申请日：2020-06-11

Applicant: TATA STEEL IJMUIDEN B.V.

Inventor： Shangping CHEN ,  Richard MOSTERT ,  Maxim Peter AARNTS ,  Stefanus Matheus Cornelis VAN BOHEMEN

IPC: C21D9/52 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C23C2/40 ,  C21D8/02 ,  C21D6/00

Abstract: A heat treatment of a high strength cold rolled steel strip includes the steps of a) soaking a cold rolled steel strip, b) cooling the soaked steel strip c) heat treating the cooled strip; d) cooling the heat treated steel strip to ambient temperature range; such that the steel strip has a microstructure including various ferrites, retained austenite and martensite. The main components in the steel composition include carbon, manganese, silicon and aluminium in addition to iron.

公开(公告)号：US20220316026A1

公开(公告)日：2022-10-06

申请号：US17596685

申请日：2020-06-11

Applicant: TATA STEEL IJMUIDEN B.V.

Inventor： Shangping CHEN ,  Richard MOSTERT ,  Maxim Peter AARNTS ,  Stefanus Matheus Cornelis VAN BOHEMEN

IPC: C21D9/52 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C23C2/40 ,  C21D8/02 ,  C21D6/00

Abstract: A method of heat treating a cold rolled steel strip includes soaking a cold rolled steel strip having a specific composition above (Ac3−60)° C. for a certain duration thereby obtaining a cold rolled strip having a partially austenitic microstructure; cooling of the resulting soaked steel strip to a temperature below Ms; heating and heat treating the cooled steel strip in the temperature range of Bs-Ms; and cooling the heat treated steel strip to ambient temperature.

公开(公告)号：US20220316024A1

公开(公告)日：2022-10-06

申请号：US17596673

申请日：2020-06-11

Applicant: TATA STEEL IJMUIDEN B.V.

Inventor： Shangping CHEN ,  Richard MOSTERT ,  Maxim Peter AARNTS ,  Stefanus Matheus Cornelis VAN BOHEMEN

IPC: C21D9/52 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C23C2/40 ,  C21D8/02 ,  C21D6/00

Abstract: A method of heat treating a high strength cold rolled steel strip including a) soaking a cold rolled steel strip, b) cooling the soaked steel strip c) heat treating the cooled strip; d) cooling the heat treated steel strip to ambient temperature range; such that the steel strip has a microstructure including various ferrites, retained austenite and martensite. The main components in the steel composition includes carbon, manganese, silicon and aluminium in addition to iron.