STEEL SHEET FOR CONTAINERS, AND MANUFACTURING METHOD THEREFOR

摘要

Steel sheet and manufacturing method for manufacturing steel sheet for containers are provided. For example, the steel sheet (or at least a portion thereof) can include approximately, in terms of mass%, C: 0.0800% or less, N: 0.600% or less, Si: 2.0% or less, Mn: 2.0% or less, P: 0.10% or less, S: 0.05% or less, Al: 2.0% or less, and the remainder Fe. The sheet (or portion thereof) can be cold-rolled, and then the atmosphere, temperature, time, etc. of recrystallization annealing or subsequent heat treatment may be adjusted to control the change in N content in the steel, for example controlling the N content and hardness of the surface layer and mid-thickness layer to bring them within an appropriate range. The surface roughness can be 0.90 µm or less in terms of Ra, and PPI, which is the number of concavo-convex peaks per one inch of length, may be 250 or more.