Method of manufacturing T-3 grade low temper black plates

Details Method of manufacturing T-3 grade low temper black plates Method of manufacturing T-3 grade low temper black plates

1983-11-14

1985-12-31

Stallard, Wayland

Metal treatment

Compositions

Heat treating

C21D 946

Patent

active

045619093

ABSTRACT:
A method of manufacturing T-3 grade low temper blackplates having an excellent corrosion resistance by a continuous annealing process. In this method, after a continuously cast slab of low carbon aluminum killed steel consisting of 0.02-0.09% of C, not more than 0.04% of Si, 0.15-0.40% of Mn, 0.003-0.02% of soluble Al, not more than 0.0040% in total of N and the balance of Fe and inevitable impurities is subjected to hot rolling, coiled at a temperature of less than 580.degree. C., pickled and subjected to cold rolling, the resulting cold-rolled strip is subjected to such a continuous annealing that the strip is maintained at a temperature above 680.degree. C. for at least 20 seconds, quenched up to a temperature below 500.degree. C. at a cooling rate of 10.degree.-500.degree. C./sec, maintained at a temperature of 350.degree.-500.degree. C. for at least 20 seconds and cooled to room temperature.

REFERENCES:
patent: 4023987 (1977-05-01), Nomura et al.
patent: 4040873 (1977-08-01), Nakaoka et al.

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