Metal treatment – Compositions – Heat treating
Patent
1989-03-22
1990-09-04
Dean, R.
Metal treatment
Compositions
Heat treating
148 18, 148156, 427405, 134 9, 134 15, C21D 148, C21D 958, C23C 218, C23C 220
Patent
active
049541838
ABSTRACT:
Drag out of lead with elongated steel elements (1) upon exit from a bath (2) of molten lead is prevented by bringing the elongated steel elements into contact with an amount of a substance such as H.sub.2 S, Hcl or ZnCl.sub.2 /.nNH.sub.4 Cl, that is capable of transforming lead oxide into another product at the exit conditions of said elongated steel elements (1) from the bath (2) of molten lead. The steel may emerge from the bath into a non-oxidizing atmosphere, such as a bed of coal, where the converted lead or lead compound may be mechanically stripped from the element.
REFERENCES:
patent: 1545305 (1925-07-01), Crapo et al.
patent: 2286745 (1942-06-01), Liebhafsky
patent: 4062703 (1977-12-01), Vastag
patent: 4228200 (1980-10-01), Sander et al.
Dean R.
N.V. Bekaert S.A.
Phipps Margery S.
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