Patent ID: 11965225
Assignee: ARCELORMITTAL
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 7:
8. The cold-rolled and heat treated steel sheet according to claim 7, wherein the structure consists of, in surface fraction:
between 8% and 50% of retained austenite, the retained austenite having an average C content of at least 0.4% and an average Mn content of at least 1.3*Mn %, Mn % designating the average Mn content in the steel composition;
between 40% and 80% of intercritical ferrite, ferrite grains of the intercritical ferrite having an average size of at most 1.5 μm;
at most of 15% of martensite and/or bainite; and
at most 0.3% of cementite, particles of cementite having an average size lower than 50 nm.