VERY THIN 2-PIECE CONTAINER STEEL SHEET EXCELLENT IN PUCKER RESISTANCE AT NECK DIAMETER REDUCTION AND IN EARING AND PRODUCTION METHOD THEREFOR

摘要

A 2-piece-can steel sheet characterized in that (N present as AlN)/(N content) ⊃0.5, an average diameter of AlN is 0.01 to 0.10 νm with AlN in diameter of up to 0.01 νm accounting for up to 10% of that in diameter of at least 0.005 νm, and an average diameter of MnS is 0.03 to 0.40 νm with MnS in diameter of up to 0.03 νm accounting for up to 50% of that in diameter of at least 0.005 νm. Components, a slab heating temperature at hot rolling, a coiling temperature and a re-cold-rolling ratio are specified to fulfil the above requirements, thereby making it possible to produce a heat-buckle-free, high-efficiency 2-piece-can steel sheet which is high in steel sheet yield, excellent in a can formability and reduced in pucker occurrence ratio at neck diameter reducing after drawing, ironing and stretching, and can keep a satisfactory characteristics even when annealed at a low temperature. A 2-piece-can steel sheet with a sheet thickness of up to 0.19 mm can be provided which is free from coil break at annealing, from earing at cup forming and from pucker at opening diameter reducing in the can barrel.