| 摘要 |
PROBLEM TO BE SOLVED: To provide ferritic stainless steel in which the reduction of the toughness in a heat affected zone can be prevented. SOLUTION: The ferritic stainless steel thick plate having excellent toughness in a welded joint has a composition containing, by mass, 0.001 to 0.080% C, <=1.0% Si, 0.01 to 3.00% Mn, 10 to 32% Cr, <=0.1% Al, <=4.0% Ni and 0.01 to 0.010% Mg, and the balance Fe with inevitable impurities, and in which Mg based oxides having a maximum diameter of 0.05 to 2.00μm are present at a piece density of >=10 pieces/mm<2> in an optional cross-section. The steel thick plate contains 0.01 to 0.80% Ti as well, or further contains one or two selected from 0.01 to 0.50% Zr and 0.005 to 0.500% rare earth metals.
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