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Title: Creep resistant high temperature martensitic steel

The disclosure provides a creep resistant alloy having an overall composition comprised of iron, chromium, molybdenum, carbon, manganese, silicon, nickel, vanadium, niobium, nitrogen, tungsten, cobalt, tantalum, boron, and potentially additional elements. In an embodiment, the creep resistant alloy has a molybdenum equivalent Mo(eq) from 1.475 to 1.700 wt. % and a quantity (C+N) from 0.145 to 0.205. The overall composition ameliorates sources of microstructural instability such as coarsening of M.sub.23C.sub.6 carbides and MX precipitates, and mitigates or eliminates Laves and Z-phase formation. A creep resistant martensitic steel may be fabricated by preparing a melt comprised of the overall composition followed by at least austenizing and tempering. The creep resistant alloy exhibits improved high-temperature creep strength in the temperature environment of around 650.degree. C.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1225785
Assignee:
U.S. Department of Energy NETL
Patent Number(s):
9,181,597
Application Number:
13/868,139
Resource Relation:
Patent File Date: 2013 Apr 23
Research Org:
National Energy Technology Lab. (NETL), Pittsburgh, PA, and Morgantown, WV (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Other works cited in this record:

Martenstitic stainless steel with improved machinability
patent, June 1995

Rotor for steam turbine and manufacturing method thereof
patent, July 1998

Martensitic alloy steels having intermetallic compounds and precipitates as a substitute for cobalt
patent, April 2004

Fine-grained martensitic stainless steel and method thereof
patent, May 2005

Carbo-nitrided case hardened martensitic stainless steels
patent, March 2007

Corrosion-resistant, cold-formable, machinable, high strength, martensitic stainless steel
patent, September 2011

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