Alloys or metallic compositions – Containing over 50 per cent metal but no base metal – Iron containing
Patent
1991-12-20
1993-03-16
Yee, Deborah
Alloys or metallic compositions
Containing over 50 per cent metal but no base metal
Iron containing
138177, 138DIG6, 428585, 428678, 420443, 420454, C22C 1905, C22C 3000
Patent
active
051942224
ABSTRACT:
An alloy exhibiting corrosion resistance in a combustion environment where V, Na, S and Cl are present comprises, in weight percent, not more than 0.05% C, 0.02-0.5% Si, 0.02-0.5% Mn, 15-35% Cr, 0.5-4% Mo, 10-40% Co, 5-15% Fe, 0.5-5% W, 0.0003-0.005% Ca and the remainder of Ni at a content of not less than 4% and unavoidable impurities, provided that Cr (%)+0.5Ni (%)+3Mo (%).gtoreq.30 (%) and Ni (%)+0.5Co (%).gtoreq.Cr (%)+Mo (%)+W (%). A composite steel tube exhibiting corrosion resistance in a combustion environment where V, Na, S and Cl are present comprises an inner tube constituted of Cr-containing boiler tube and an outer tube constituted of the alloy.
REFERENCES:
patent: 3834901 (1974-09-01), Kamiya et al.
Key to Steels, 10 Edition 1974, Germany.
Denpo Kozo
Ishitsuka Tetsuo
Ito Michihisa
Miyasaka Akihiro
Ogawa Hiroyuki
Nippon Steel Corporation
Yee Deborah
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