| 摘要 |
PURPOSE:To obtain a heat resistant austenitic steel for the blades and bolts of a turbine having superior strength at >=600 deg.C by regulating the maximum amounts of C, Si and Mn and adding prescribed amounts of Cr, Ni, Mo, Ti, Al, V, B and Zr. CONSTITUTION:This heat resistant austenitic steel consists of, by weight, <=0.1% C, <=0.5% Si, <=2.0% Mn, 10-20% Cr, 20-30% Ni, 0.5-3.0% Mo, 2.0-4.0% Ti, 0.3-1.0% Al, 0.1-0.5% V, 0.001-0.01% B, 0.005-0.1% Zr and the balance Fe. Metals as starting materials are mixed, melted and deoxidized, and the resulting molten metal having said composition is cast to form an ingot. The ingot is preferably subjected to vacuum arc or electro-slag remelting so as to improve the ductility at high temp., and is forged or rolled and subjected to necessary heat treatment to obtain the heat resistant austenitic steel.
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