| 摘要 |
PROBLEM TO BE SOLVED: To provide ferritic stainless steel having excellent heat resistance and workability, and to provide its production method. SOLUTION: The ferritic stainless steel sheet has components satisfying, by mass,≤0.015% C, 0.10 to 0.25% Si, 0.10 to 0.3% Mn (wherein, Si≤Mn),≤0.04% P,≤0.01% S, 0.001 to 0.2% Al,≤0.015% N, 15 to 20% Cr,≤0.5% Ni, 1.0 to 2.5% Mo,≤0.2% V, Ti: 3X(C+N) to 0.25%, and 0.3 to 1% Nb (wherein, C+N:≤0.02%), and the balance Fe with inevitable impurities. The steel sheet may comprise 0.1 to 1.0% Cu and 0.0003 to 0.005% B. It is also possible that the steel has a sheet thickness of 1 to 3 mm, a 0.2% proof stress of≥15 MPa at 950°C, a mean elongation value of≥30% at ordinary temperature, and a mean r value of≥1.3. The production method is characterized in that, in a process where an ingot or a slab is cast, and is subjected to hot rolling, hot rolled sheet annealing, pickling, cold rolling, final annealing and pickling to obtain a product, the temperature in the hot rolled sheet annealing is controlled to 800 to 950°C. COPYRIGHT: (C)2006,JPO&NCIPI
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