The steel sheets and its production manner null which for 2 piece container are superior in deep drawing Characteristic and resistance neck wrinkle

摘要

PROBLEM TO BE SOLVED: To obtain a steel sheet excellent in deep drawability and necking wrinkle resistance and capable of avoiding the occurrence of coil break in an annealing stage to prevent reduction in productivity by specifying respective contents of C, N, and Ti and also specifying the ratio between N existing as AlN and N in a steel. ;SOLUTION: The steel sheet has a composition which contains, by weight, ≤0.002% C, ≤0.004% N, and 0.02-0.04% Ti and in which (N existing as AlN)/(N in a steel)≤0.2 is satisfied and further, if necessary, Al/Ti$1 is satisfied and Al content is regulated to ≤0.02% and further 0 content is regulated to 0.001-0.007%. This steel sheet can be suitably used for production of a two-piece vessel by being subjected to drawing and ironing or stretching. In this Ti-added extra low carbon steel, the occurrence of heat buckle can be prevented even in the case of low-temp. annealing owing to the limitation of the ratio between N in AlN and N in the steel, and also wrinking at the time of necking can be prevented. This steel sheet can be obtained by casting a steel slab of prescribed composition and regulating the heating temp. in its hot rolling to ≤1000°C.;COPYRIGHT: (C)1998,JPO