C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
75/135, 148/34.4
C21D 8/02 (2006.01)
Patent
CA 1234533
ABSTRACT OF THE DISCLOSURE PROCESS FOR PRODUCING HEAT-RESISTANT FERRITIC STAINLESS STEEL SHEET A process for producing heat-resistant ferritic stainless steel sheet which exhibits improved toughness and productivity is disclosed. The process comprises the following steps: (a) hot rolling a steel with a finishing temperature of not higher than 850°, said steel comprising, by weight %, C : not more than 0.07%, Si: 1.5 - 3.5%, Mn: not more than 2.0%, Cr: 10 - 25%, N : not more than 0.05%, Nb: 5X(C% + N%) - 20X(C% + N%), optionally at least one element selected from the group consisting of Al, Y, Ca, and REM in a total amount of 0.3% or less, and the balance iron and incidental impurities; and (b) annealing the resulting hot rolled steel sheet at a temperature of 820- 1000°C. Cold rolling may be applied to the annealed hot-rolled steel sheet.
448033
Akiyama Shunichiro
Fujikawa Hisao
Koike Masao
Murayama Junichiro
Shida Yoshiaki
Nippon Stainless Steel Co. Ltd.
Osler Hoskin & Harcourt Llp
Sumitomo Metal Industries Ltd.
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