| 摘要 |
PURPOSE: To impart oxidation resistance at a high temp., structural stability for a long time and weldability to a steel by specifying value expressed byαin a Cr-Ni austenitic stainless steel having a specified compsn. contg. Al. CONSTITUTION: The compsn. of an austenitic stainless steel for welding structural high temp. apparatus is composed of the one contg., by weight, <=0.12% C, <=1.0% Si, <=5.0% Mn, <=0.04% P, <=0.03% S, 14 to 22% Cr, 10 to 25% Ni, 1.0 to 3.5% Al, <=0.02% N, 0.001 to 0.010% Ca, 0 to 0.05% Mg, Y, La and Ce by 0 to 0.07% in total, and the balance Fe with inevitable impurities, and also, the conditions ofα=(1.5Si+Cr+3Al)-(0.5Mn+Ni+30C+30N)<9 are satisfied. Thus, the heat resistant austenitic stainless steel capable of withstanding using conditions characteristic of new type power plants such as nonpressure withstanding and noncooling parts at 800 to 900 deg.C can be obtd.
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