Alloy and composite steel tube with corrosion resistance in comb

Details Alloy and composite steel tube with corrosion resistance in comb Alloy and composite steel tube with corrosion resistance in comb

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.

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