| 摘要 |
PROBLEM TO BE SOLVED: To provide a fine granular austenitic stainless steel sheet in which a stress-corrosion cracking as a defect is eliminated, and good workability is also obtained by regulating average crystal grain diameter to≤10μm in Ni content of≤8% and the characteristics of the crystal grain boundary. SOLUTION: The austenitic stainless steel sheet has the steel composition composed of, by mass%,≤0.05% C, 14-19% Cr,≤2% Si,≤4% Mn, 5-8% Ni,≤4% Cu,≤0.1% N, and the balance Fe with inevitable impurities, wherein Md=551-462(C+N)-9.2Si-8.1Mn-13.7Cr-29(Ni+Cu)-18.2Mo is in the range of -20 to 40; the average crystal diameter is≤10μm; and the ratio of a large bevel grain boundary of≥15°is more than 80%. In the manufacturing method, a cold-rolling is performed under rolling reduction ratio of≥70% and rolling temperature of≤50°C; a last annealing is performed at 700-900°C; and holding time is 4-24 hr. COPYRIGHT: (C)2011,JPO&INPIT
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