| 摘要 |
PROBLEM TO BE SOLVED: To provide a ferritic heat resistant steel sheet excellent in the creep strength and toughness of a base metal and a welded joint and to provide a method for producing the same. SOLUTION: This ferritic heat resistant steel sheet has a composition containing C, Si, Mn, P, S, Cr, Al, Ti, Mg and N in specified ranges, one or two kinds of Mo and W in specified ranges, furthermore, one or more kinds among V, Ta, Nb and Zr in specified ranges, and the balance Fe with inevitable impurities, contains one or two kinds selected from Mg-containing oxide particles with a particle size of 0.002 to 0.1μm and blended particles with a particle size of 0.005 to 2μm consisting of Mg-containing oxides and carbonitrides precipitated with the same as neuclei by 1×104 to 1×108 pieces/mm2 in total.
|
