| 摘要 |
PROBLEM TO BE SOLVED: To produce a steel sheet for a shadow mask free from MnS series inclusions exerting an adverse influence on its pierciability even in the case the content of S by a negligible degree is contained as for nitriding at the time of annealing, furthermore good in the growability of crystal grains at the time of secondary annealing and low in yield strength after secondary annealing. SOLUTION: In a steel sheet before photoetching contg., by weight, <=0.005% C, 0.1 to 0.5% Mn, 0.001 to 0.02% S, 0.002 to 0.1% acid soluble Al (Sol.Al) and <=0.008% N, the range of the grain size equivalent to±2σ(σdenotes the standaord deviation) of the size distribution of MnS series inclusions is regulated to 0.05 to 2μm.
|
