| 摘要 |
PROBLEM TO BE SOLVED: To obtain a stainless steel sheet excellent in cryogenic characteristics in the weld zone by composing it of a steel of austenitc single phases contg. specified amounts of C, Si, Mn, Cr, Ni, N, Ca, Mg and Fe and regulating the maximum size of the oxides of Ca and Mg to be precipitated. SOLUTION: This steel sheet is composed of a stainless steel of austenitic single phases having a compsn. contg., by weight, <=0.05% C, <=2% Si, 0.1 to 16% Mn, 10 to 24% Cr, 8 to 25% Ni and 0.1 to 0.35% N, contg. one or more kinds of 0.0003 to 0.01% Ca and 0.0003 to 0.01% Mg and one or more kinds of <=4% Mo and 0.005 to 0.6% Nb, and the balance substantial Fe. Furthermore, the maximum size of the oxides of Ca and Mg to be precipitated is regulated to <=1μm. In the process of subjecting the steel to melting, casting, hot rolling, cold rolling and heat treatment to form into a thin steel sheet, the content of dissolved oxygen in the stainless steel is regulated to 20 to 100 ppm, and Ca and Mg are added thereto.
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