Austenitic heat resistant steel excellent in elevated temperatur

Details Austenitic heat resistant steel excellent in elevated temperatur Austenitic heat resistant steel excellent in elevated temperatur

1995-06-26

1997-05-06

Yee, Deborah

Alloys or metallic compositions

Ferrous

Nine percent or more chromium containing

420 60, 420 61, C22C 3842

Patent

active

056268173

ABSTRACT:
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.

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