Metal treatment – Compositions – Heat treating
Patent
1976-12-23
1979-02-20
Smith, Ronald H.
Metal treatment
Compositions
Heat treating
148 16, 427248E, 427320, 427321, C23C 1108
Patent
active
041405528
ABSTRACT:
A method of surface treatment of aluminum-killed and low alloy steel strip and sheet for fluxless hot dip metallic coating which comprises heating the steel in a furnace atmosphere containing the hot gaseous combustion products of air with a sulfur bearing gaseous fuel including 5 to 1600 grains of sulfur per 100 cubic feet of fuel wherein the atmosphere includes sulfur compounds and from about 6% free oxygen to about 7% by volume excess combustibles whereby to form a sulfur and oxygen rich film on the steel surfaces, passing the steel into a further heating section wherein it is brought to a maximum temperature of about 593.degree. to about 927.degree. C. in a reducing atmosphere containing at least 10% hydrogen by volume, passing the steel into a cooling section having an atmosphere containing at least 10% hydrogen and the balance nitrogen whereby to reduce the sulfur and oxygen rich film to a metallic iron surface, and cooling the steel approximately to the temperature of the molten coating metal bath. Coke oven gas may be used as the fuel for the furnace.
REFERENCES:
patent: 1141770 (1915-06-01), Carnahan
patent: 1672180 (1928-06-01), Smith
patent: 2110893 (1938-03-01), Sendzimir
patent: 2562770 (1951-07-01), Carter, Jr.
patent: 3115421 (1963-12-01), Seymour
patent: 3925579 (1975-12-01), Flinchum et al.
Arnold Jerry L.
Dunbar Frank C.
Armco Steel Corporation
Lawrence Evan K.
Smith Ronald H.
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