C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/42
C21D 9/52 (2006.01) C21D 9/56 (2006.01)
Patent
CA 1137394
- 28 - PROCESS FOR CONTINUOUSLY ANNEALING A COLD-ROLLED LOW CARBON STEEL STRIP ABSTRACT OF THE DISCLOSURE A cold-rolled low carbon steel strip is continuously annealed by rapidly heating the steel strip with a reducing combustion flame to a temperature of 500°C to an Ac3 point of the steel strip to cause the thickness of a layer of oxides produced on the peripheral surface of the steel strip to not exceed 1000 angstroms; by maintaining the temperature of the rapidly heated steel strip in a range of from 700°C to the Ac3 point, in a reducing atmosphere, to reduce the oxide layer; by cooling the steel strip to a desired temper- ature, and; optionally, by overaging the cooled steel strip at a temperature of 300 to 550°C.
349671
Naitoh Hiromitsu
Nitto Hajime
Saito Takao
Goudreau Gage & Associates
Nippon Steel Corporation
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