Patent ID: 11884990
Assignee: TATA STEEL NEDERLAND TECHNOLOGY B.V.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 19:
20. The method according to claim 15, wherein the hot-rolled steel is pickled, cold-rolled, annealed at an annealing temperature of between Ac1-temperature and Ac3-temperature, or above Ac3-temperature, cooled followed by a low temperature annealing, at an annealing temperature of between 170 to 350° C. during 12 to 250 hours, and optionally temper rolled,
wherein Ac3-temperature is a temperature at which austenite begins to form during heating, and
wherein Ac3-temperature is a temperature at which transformation of ferrite to austenite is completed during heating.