Method of manufacturing T-3 grade low temper blackplates.

摘要

A method of manufacturing T-3 grade low temper blackplates having an excellent corrosion resistance by continuous annealing process is disclosed. 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<Sub>%</Sub> of Mn, 0.003-0.02% of soluble Ac 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°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°C for at least 20 seconds, quenched up to a temperature below 500°C at a cooling rate of 10-600°C/sec. maintained at a temperature of 350-500°C for at least 20 seconds and cooled to room temperature.