Alloys or metallic compositions – Ferrous – Nine percent or more chromium containing
Patent
1997-07-28
1998-10-13
Yee, Deborah
Alloys or metallic compositions
Ferrous
Nine percent or more chromium containing
420 64, 420 69, C22C 3830, C22C 3852
Patent
active
058208178
ABSTRACT:
A stainless steel comprises additives including at least one of rare earth elements and boron, so as to exhibit resistance to long term aging embrittlement. The stainless steel also contains balanced amounts of nickel and cobalt to minimize a ration of nickel to cobalt and optimize aging embrittlement resistance with as tempered toughness. The remainder of the stainless steel comprising, by weight percentage:
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"Thermal Ageing Studies of 9%Cr 1%Mo Steel," M. Wall et al., Metallurgy Division, AERE Harwell, Didcot, Oxon, UK, Jan. 1984.
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"Heat Treatment, Ageing Effects and Microstructure of 12% Cr Steels," J.W. Schinkel et al., ASM International Conference, American Society for Metals, 1983, pp. 131-149.
"The Effect of Sulphur on the Temper Embrittlement Susceptibility of a Rare Earth--Containing Low Alloy Steel," W. Barrett et al., Dept. of Metallurgy & Materials Eng., Univ. of the Witwatersrand, Johannesburg, South Africa, 1987, Pergamon Journals of Ltd, vol. 21, pp. 123-128.
Angeliu Thomas Martin
Briant Clyde Leonard
Mukira Charles Gitahi
Cusick Ernest G.
General Electric Company
Johnson Noreen C.
Yee Deborah
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