| 摘要 |
An austenitic heat resistant alloy, which comprises by mass percent, C: over 0.02 to 0.15%, Si ‰¤ 2%, Mn ‰¤ 3%, P‰¤ 0.03%, S ‰¤ 0.01%, Cr: 28 to 38%, Ni: over 40 to 60%, Co ‰¤ 20% (including 0%), W over 3 to 15%, Ti: 0.05 to 1.0%, Zr: 0.005 to 0.2%, Al: 0.01 to 0.3%, N ‰¤ 0.02%, and Mo < 0.5%, with the balance being Fe and impurities, in which the following formulas (1) to (3) are satisfied has high creep rupture strength and high toughness after a long period of use at a high temperature, and further it is excellent in hot workability. This austenitic heat resistant alloy may contain a specific amount of one or more elements selected from Nb, V, Hf, B, Mg, Ca, Y, La, Ce, Nd, Sc, Ta, Re, Ir, Pd, Pt and Ag. P ‰¤ 3/{200(Ti + 8.5 × Zr)}... (1), 1.35 × Cr ‰¤ Ni + Co ‰¤ 1.85 × Cr ... (2), Al ‰¥ 1.5 × Zr ... (3). |
