| 摘要 |
PURPOSE: To produce a thick austenitic stainless steel plate with >=50mm plate thickness in which the magnetic permeability at any location is regulated to <=1.05 at a low pressure reduction ratio. CONSTITUTION: The slab of aγstainless steel having a compsn. contg. <=0.06% C, <=2% Si, <=5% Mn and 15 to 27% Cr and satisfying 1.4×(Cr equivalent) -14 <= (Ni equivalent) <= 1.4×(Cr equivalent) - 10, Cr equivalent = 1.5×Si + Cr + Mo, Ni equivalent = 0.5×Mn + 30×(C + N) + Ni and S+O-0.8×Ca-30<=0(ppm) is subjected to hot forging or hot rolling at >=1.5 pressure reduction ratio, is thereafter heated at 1150 to 1300 deg.C for t(min)=0.002×exp (18000/T) or above and is subjected to thick plate rolling and solid solution heat treatment. Thus, the production of the extremely-thick nonmagnetic stainless steel sheet which has been difficult heretofore is made possible.
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