| 摘要 |
PURPOSE:To provide the titled heat resistant cast alloy having good weldability, obtained by specifying a composition consisting of C, Si, Mn, P, S, Cr, Ni, Co, W, Al, B, Zr, Ti and Fe. CONSTITUTION:A heat resistant cast alloy contains 0.3-0.55% C, 3.0% or less Si, 2.0% or less Mn, 0.03% or less P, 0.30% or less S, 20.0-30.0% Cr, 20.0- 40.0% Ni, 5.0-20.0% Co. 0.5-6.0% W, 0.02-0.6% Al and 0.0005-0.01% B and additionally contains 0.02-0.5% Zr or 0.02-0.5% Zr and 0.02-0.5% Ti and comprises the remainder of substantially Fe and has high creep breaking strength in a high temp. region, excellent carburizing resistance and good weldability.
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