PURPOSE:To improve Young's modulus and hot workability and to prevent deterioration in strength in a weld zone after welding by limiting respective amounts of C, Si, Mn, Cr, Ni, Cu, Mo, rare earth elements, etc., and the value of Nibal represented by a specific expression. CONSTITUTION:The titled stainless steel consists of, by weight, =0.05% C, 1-5% Si, 3-10% Mn, 17-22% Cr, 1-7% Ni, 0.5-3% Cu, 0.5-3% Mo, one ore more kinds among 0.005-0.04% rare earth elements, 0.005-0.04% Mg, 0.001-0.006% B and 0.002-0.01% Ca, and the balance Fe and has a Nibal value of -12--6. The above Nibal value is represented by -1.1{Cr(%)+1.5XSi(%)+0.5XNb(%)+Mo(%)}+30{ C(%)+N(%) }+0.5XMn(%)+0.3XCu (%)+Ni(%)+8.2.
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