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US 4,177,326 AGranted
Process for coating stainless steel with a lead-based alloy and article
AssigneeVallourec (Usines a Tubes de Lorraine-Escaut et Vallourec Reunies)
InventorsBernard A. M. Windal, Edmond Lobry
Life of this patent
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Abstract
The invention relates to a process and installation for making stainless els coated with a lead-based alloy and having undergone annealing. The surface of the product is first prepared by mechanical treatment, then the product is pre-coated by known techniques such as hot tin-plating, after which the annealing treatment is effected, followed by the final coating. Such products may be used, inter alia, in the manufacture of car radiators.
Claims8
Process for manufacturing a strip of annealed stainless steel having a lead-based alloy coating, comprising
- (a) mechanically preparing the surface of a stainless steel strip by cold rolling to remove oxide therefrom;
- (b) pre-coating said strip in a lead-based alloy bath;
- (c) heat treating the pre-coated strip by passing it through a second bath of the same alloy at an annealing temperature suifficient to render it deformable;
- and
- (d) finally coating said strip by passing it through a third bath of the same alloy at a temperature lower than said annealing temperature.
2 more elements
Dependencies are inferred from the claim text.