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Title: Creep resistant, precipitation-dispersion-strengthened, martensitic stainless steel and method thereof

An iron-based, corrosion-resistant, precipitation strengthened, martensitic steel essentially free of delta ferrite for use at high temperatures has a nominal composition of 0.05-0.1 C, 8-12 Cr, 1-5 Co, 0.5-2.0 Ni, 0.41-1.0 Mo, 0.1-0.5 Ti, and the balance iron. This steel is different from other corrosion-resistant martensitic steels because its microstructure consists of a uniform dispersion of fine particles, which are very closely spaced, and which do not coarsen at high temperatures. Thus at high temperatures this steel combines the excellent creep strength of dispersion-strengthened steels, with the ease of fabricability afforded by precipitation hardenable steels.
Inventors:
 [1]
  1. (N. Huntingdon, PA)
Issue Date:
OSTI Identifier:
869287
Assignee:
Buck, Robert F. (North Huntingdon, PA) CHO
Patent Number(s):
US 5310431
Contract Number:
FG07-89ER12892
Research Org:
Carnegie-Mellon University
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
creep; resistant; precipitation-dispersion-strengthened; martensitic; stainless; steel; method; iron-based; corrosion-resistant; precipitation; strengthened; essentially; free; delta; ferrite; temperatures; nominal; composition; 05-0; 8-12; 1-5; 5-2; 41-1; 1-0; balance; iron; steels; microstructure; consists; uniform; dispersion; fine; particles; closely; spaced; coarsen; combines; excellent; strength; dispersion-strengthened; ease; fabricability; afforded; hardenable; delta ferrite; essentially free; fine particles; balance iron; stainless steel; closely spaced; fine particle; uniform dispersion; martensitic steel; precipitation hardenable; nominal composition; creep resistant; structure consist; precipitation strengthened; martensitic stainless; /148/