| 摘要 |
The alloy consists essentially of, by weight, 20 - 32% chromium, 0.5 - 5.0% aluminium, 0.5 - 4.0% molybdenum, 0.05 - 0.5% M (wherein M represents zirconium and/or hafnium), with the balance being substantially iron, wherein the alloy includes an oxide film on the surface, the film being composed substantially of alpha -A l 2O3. The oxide film is formed by heat treating the alloy in air or in oxygen at a temperature of 1100 DEG C - 1300 DEG C. |
