| 摘要 |
<p>A high strength, sulfidation resistant Cr-Co-Ni base alloy for long-life service at 538 °C to 816 °C containing in % by weight about 23.5-25.5 % Cr, 15.0-22 % Co, 0.2-2.0 % Al, 0.5-2.5 % Ti, 0.5-2.5 % Nb, up to 2.0 % Mo, up to 1.0 % Mn, 0.3-1.0 % Si, up to 3.0 % Fe, up to 0.3 % Ta, up to 0.3 % W, 0.005-0.08 % C, 0.01-0.3 % Zr, 0.001-0.01 % B, up to 0.05 % rare earth as misch metal, 0.005-0.025 % Mg plus optional Ca, balance Ni including trace additions and impurities. The alloy provides a combination of strength, ductility, stability, toughness and oxidation/sulfidation resistance so as to render the alloy range uniquely suitable for engineering applications where sulfur-containing atmospheres are life limiting, in applications such as exhaust valves for diesel engines and in tubes for coal-fired steam boilers.</p> |
