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AssigneeSumitomo Metal Industries, Ltd.
InventorsYoshiatsu Sawaragi, Hiroyuki Senba
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A heat resistant austenitic stainless steel having high strength at elevated temperatures. The steel consists of 0.05 to 0.15% carbon, not more than 0.5% silicon, 0.05 to 0.50% manganese, 17 to 25% chromium, 7 to 20% nickel, 2.0 to 4.5% copper, 0.10 to 0.80% niobium, 0.001 to 0.010% boron, 0.05 to 0.25% nitrogen, 0.003 to 0.030% sol.aluminum, 0 to 0.015% magnesium and the balance being iron and incidental impurities. The steel may contain 0.3 to 2.0% molybdenum and/or 0.5-4.0% tungsten. The steel exhibits high creep rupture strength at elevated temperatures for long periods of time, and can be produced at low cost. The steel is suitable for use in the structural members for boilers, chemical plants and other installations operated in a high temperature environment.
A heat resistant austenitic stainless steel having high strength at elevated temperatures, consisting essentially of, on the weight percent basis, 0.05 to 0.15% carbon, not more than 0.3% silicon, 0.05 to 0.50% manganese, 17 to 25% chromium, 7 to 20% nickel, 2.0 to 4.5% copper, 0.10 to 0.80% niobium, 0.001 to 0.010% boron, 0.05 to 0.25% nitrogen, 0.003 to 0.030% sol. aluminum and the balance being iron and incidental impurities.
A heat resistant austenitic stainless steel having high strength at elevated temperatures, consisting essentially of, on the weight percent basis, 0.05 to 0.15% carbon, not more than 0.5% silicon, 0.05 to 0.50% manganese, 17 to 25% chromium, 7 to 20% nickel, 2.0 to 4.5% copper, 0.10 to 0.80% niobium, 0.001 to 0.010% boron, 0.05 to 0.25% nitrogen, 0.003 to 0.030% sol. aluminum, one or both of 0.5%<Mo.ltoreq.2.0% and 0.5 to 4.0% tungsten, the molybdenum and/or tungsten being present in an amount effective to improve elevated temperature strength, and the balance being iron and incidental impurities.
A heat resistant austenitic stainless steel having high strength at elevated temperatures, consisting essentially of, on the weight percent basis, 0.05 to 0.15% carbon, not more than 0.5% silicon, 0.05 to 0.50% manganese, 17 to 25% chromium, 7 to 20% nickel, 2.0 to 4.5% copper, 0.10 to 0.80% niobium, 0.001 to 0.010% boron, 0.05 to 0.25% nitrogen, 0.003 to 0.030% sol. aluminum, 0.001 to 0.015% magnesium, and the balance being iron and incidental impurities.
A heat resistant austenitic stainless steel having high strength at elevated temperatures, consisting essentially of, on the weight percent basis, 0.05 to 0.15% carbon, not more than 0.5% silicon, 0.05 to 0.50% manganese, 17 to 25% chromium, 7 to 20% nickel, 2.0 to 4.5% copper, 0.10 to 0.80% niobium, 0.001 to 0.010% boron, 0.05 to 0.25% nitrogen, 0.003 to 0.030% sol. aluminum, 0.001 to 0.015% magnesium, one or both of 0.3 to 2.0% molybdenum and 0.5 to 4.0% tungsten, and the balance being iron and incidental impurities.
Dependencies are inferred from the claim text.