Method of treating steel strip and sheet surfaces, in sulfur-bea

Details Method of treating steel strip and sheet surfaces, in sulfur-bea Method of treating steel strip and sheet surfaces, in sulfur-bea

1976-12-23

1978-10-31

Smith, Ronald H.

Metal treatment

Compositions

Heat treating

148 16, 427248E, 427 32D, 427321, C23C 1108

Patent

active

041232917

ABSTRACT:
A method of preparing the surfaces of steel strip and sheet stock for fluxless hot dip coating with molten metal by passing the stock through a first heating zone containing the hot gaseous products of combustion of a sulfur-bearing gaseous fuel with air, continuing the heating in a further heating zone, and cooling the stock approximately to the temperature of the molten coating metal in a reducing atmosphere. The radiant energy absorptivity of the stock is increased by forming a visible sulfur and oxygen rich layer thereon in the first heating zone and preserving the layer throughout the further heating zone. Coke oven gas may be used as fuel in the first heating zone.

REFERENCES:
patent: 1141770 (1915-06-01), Carnahan
patent: 1672180 (1928-06-01), Smith
patent: 2110893 (1938-03-01), Sendzimir
patent: 2197622 (1940-04-01), Sendzimir
patent: 3936543 (1976-02-01), Byrd et al.

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