Annealing steel strip using molten B.sub.2 O.sub.3, SiO.sub.2 Na

Details Annealing steel strip using molten B.sub.2 O.sub.3, SiO.sub.2 Na Annealing steel strip using molten B.sub.2 O.sub.3, SiO.sub.2 Na

1983-02-04

1984-09-25

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

148 206, 148 27, C21D 156

Patent

active

044734123

ABSTRACT:
A process for annealing steel strip comprising dipping the strip in a molten glass bath maintained 950.degree. C. or higher to anneal it, taking the strip out of the bath to form coagulated glass coatings on the surfaces of the strip and cooling the strip to destroy and peel off the coatings. The bath comprises 38.0 to 62.0% of B.sub.2 O.sub.3, 18.0 to 32.0% of SiO.sub.2, 18.0 to 32.0% of Na.sub.2 O partly replaceable with K.sub.2 O, up to 10.0% of CaO partly replaceable with MgO, BaO, ZnO and/or SrO, up to 6.0% of Li.sub.2 O, up to 10.0% of Al.sub.2 O.sub.3 and 0.5 to 4.0% of NaF, and has a viscosity not exceeding 200 poises as measured at 950.degree. C. The strip is preferably not exposed to air while above 400.degree. C.

REFERENCES:
patent: 1919136 (1933-07-01), Smith
patent: 2328932 (1943-09-01), Streicher
patent: 2328933 (1943-09-01), Streicher
patent: 2337186 (1943-12-01), Caugherty
patent: 3158515 (1964-11-01), Michael
patent: 4358544 (1982-11-01), Skedgell

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