SOFT BLACKPLATES WITH HARDNESS HR 30T OF 51± 3 FOR TINNING AND PRODUCTION METHOD FOR THE SAME

摘要

Soft blackplates with hardness HR30T of 51±3 for tinning comprise (wt.%) up to 0.005 C, 0.20-0.30 Mn, 0.03-0.06 Al, up to 0.03 Si, 0.03-0.06 Ti, up to 0. 012 P, up to 0.015 S, up to 0.003 N, up to 0.004 O, and the balance Fe and other inevitable impurities. The method for producing the soft blackplates involves the following steps: steelmaking, continuous casting, hot rolling, combination of pickling and cold tandem rolling, continuous annealing, and temper rolling. The main process parameters in the method are as follows: slab delivering temperature is 1190-1250 deg. C, final rolling temperature is 880-920 deg. C, coiling temperature is between 560 deg. C and 620 deg. C, annealing temperature is 730-760 deg. C, holding time is 25-50 seconds, temper elongation is 1.2-2.2%.