Production method null of the martensitic type stainless steel plate which is superior in formation processability, the oxidation resistance and resistance rijingu

摘要

PURPOSE:To improve the formability, oxidation and ridging resistances of a martensitic stainless steel sheet by annealing a hot rolled sheet of a steel obtd. by adding proper amounts of Al and N to a martensitic stainless steel under prescribed conditions satisfactory for recrystallization and softening. CONSTITUTION:A steel contg., by weight, =0.4% C, =1% Si, =1% Mn, =0.6% Ni, 10-15% Cr, 0.025-0.3% Al and 0.025-0.06% N is refined. This martensitic stainless steel stock is hot rolled and the resulting hot rolled sheet is annealed at 650-800 deg.C for =300sec. It is then descaled, cold rolled and finish-annealed.