FREE-CUTTING FERRITIC STAINLESS STEEL

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PROBLEM TO BE SOLVED : To provide a free-cutting stainless steel containing no harmful free-cutting elements and having good corrosion resistance. SOLUTION : The free-cutting ferritic stainless steel material has a composition comprising, by mass%, 0.01 to 0.5% C, 1.0% or less Si, 1.0% or less Mn, 0.005 to less than 0.05% S, 10 to 30% Cr, 0.6% or less Ni, 0.5 to 4.0% Cu, 0.02 to 1.0% Ti, and optionally, 1.0% or less Nb, 3.0% or less Mo, 1.0% or less Zr, 1.0% or less Al, 1.0% or less V, and at least one of rare earth metals (REM) in an amount of 0.05% or less, with the balance substantially consisting of Fe, and has such a metal structure that a Cu phase with a particle diameter of 0.01 μm or larger and a Ti compound phase containing S and C as constituent elements with a particle diameter of 0.1 to 10 μm are dispersed in a matrix. COPYRIGHT : (C)2007, JPO&INPIT