Patent ID: 11970757
Assignee: THYSSENKRUPP AG
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H  Y | IPC C

Claim 6:
7. A process for producing a non-oriented electrical steel strip or sheet according to claim 1, comprising at least the following process steps:
(A) providing a hot-rolled, hot strip annealed non-oriented electrical steel strip or sheet in a thickness of 1.5 to 2.5 mm,
(B) cold rolling the electrical steel strip or sheet from step (A) to a thickness of 0.255 to 0.31 mm in order to obtain a cold-rolled strip,
(C) final heat treating the cold-rolled strip from step (B) in order to obtain the non-oriented electrical steel strip or sheet, and
(D)cooling the finally heat-treated cold-rolled strip from step (C) at a usual average cooling rate of from 1 K/s to 10 K/s in a nonoxidizing atmosphere to a lower limiting temperature of 500° C.,
wherein the cold-rolled strip from step (B) is, in step (C), firstly heated at a heating rate of at least 40 K/s to a temperature of 860 to 940° C. and subsequently heated at a heating rate of from 3 to 20 K/s to a temperature of 1050 to 1070° C.