Analysis and Improvement on Cracking of Cold Rolled Sheet SPCC
The feedback of user is that the elongation of cold rolled sheet with cold rolled base material SPCC manu-factured by 2 250 mm production line after cold rolling and annealing is low,part of flow forming is not easily to form in punch forming process and cracking rate is higher.The cause analysis showed that its high Mn content was one of the cau-ses for slightly higher strength of steel strip so that elongation was low and steel strip was easy to crack;cooling modes of the two production lines were different,the cooling mode of preconcentration was adopted by 2 250 mm production line and the cooling mode of predispersion was adopted by CSP production line so that the strength of hot rolled steel strip manufac-tured by 2 250 mm production line was slightly higher,elongation was low and steel strip was easy to crack.The elongation of hot rolled steel strip manufactured with raw materials with thickness of 3.0～5.0 mm by 2 250 mm production line is lower than that of hot rolled steel strip manufactured by CSP production line so that the elongation of cold rolled steel strip after cold rolling and annealing is also slightly higher due to the"heredity"of rolling.
CSP production line2 250 mm production linepropertytechnology
NETL
NSTL
万方数据
