Oxidation and sulfidation resistant austenitic stainless steel

Details Oxidation and sulfidation resistant austenitic stainless steel Oxidation and sulfidation resistant austenitic stainless steel

C - Chemistry, Metallurgy

22

C

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C22C 38/40 (2006.01) C22C 38/58 (2006.01) F02B 3/06 (2006.01)

Patent

CA 1070528

ABSTRACT OF THE DISCLOSURE An austenitic stainless steel which in solution treated condition exhibits excellent strength, hardness, and resistance to oxidation and sulfidation at elevated tempera- ture, comprises from 0.20% to 0.50% carbon, 0.01% to 3.0% manganese, 18% to 35% chromium, 0.01% to 15% nickel, 0.30% to 1.0% nitrogen, 0.10% maximum phosphorus, 0.40% maximum sulfur, 2% maximum silicon, 0 to 0.75% cerium, 0 to 4% molybdenum, 0 to 3% tungsten, 0 to 2% columbium, vanadium, or mixtures thereof, and remainder substantially iron. Manganese is pre- ferably restricted to a maximum of about 2.5% in combination with a preferred minimum chromium content of 21%. The steel has particular utility for fabrication into valves and valve parts for high performance diesel engines and gasoline engines, wherein exhaust valve temperatures are encountered within the range of about 1100° to about 1600°F and higher.

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