Alloy and composite steel tube with corrosion resistance in comb

Alloys or metallic compositions – Containing over 50 per cent metal but no base metal – Iron containing

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138177, 138DIG6, 428585, 428678, 420443, 420454, C22C 1905, C22C 3000

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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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