C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/49
C21D 9/573 (2006.01) C21D 9/52 (2006.01)
Patent
CA 1152870
-19- PROCESS FOR CONTINUOUSLY ANNEALING OF A COLD ROLLED STEEL STRIP ABSTRACT The present invention involves a concept of combining the following: using instead of a direct fired furnace a radia- tion heating furnace, thereby preventing the formation of an appreciable oxide layer during the stages for heating to and holding within the requisite annealing temperature range; cooling the annealed steel strip by a cooling medium consisting of a mixture of gas and liquid, and; removing the oxide film formed during the cooling stage, by means of picking at the final step. In the present invention it is possible to eliminate the surface-quality problems caused by conventional processes and simultaneously to omit the reheating for overaging of the steel strip.
367063
Naito Hiromitsu
Nitto Hajime
Saito Takao
Goudreau Gage Dubuc
Nippon Steel Corporation
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