| 摘要 |
A heat resistant austenitic stainless steel with high strength at elevated temperatures, good steam oxidation resistance, good fire side corrosion resistance, and a sufficient structural stability, suitable for use in boilers operating at high temperatures has a composition (by weight) of: 0.04 to 0.10 % carbon (C), not more than 0.4 % silicon (Si), not more than 0.6 % manganese (Mn), 20 to 27 % chromium (Cr), 22.5 to 32 % nickel (Ni), not more than 0.5 % molybdenum (Mo), 0.20 to 0.60 % niobium (Nb), 0.4 to 4.0 % tungsten (W), 0.10 to 0.30 % nitrogen (N), 0.002 to 0.008 % boron (B), less than 0.05 % aluminium (Al), at least one of the elements Mg and Ca in amounts less than 0.010 % Mg and less than 0.010 % Ca, and the balance being iron and inevitable impurities. |
