Metal treatment – Compositions – Heat treating
Patent
1977-08-15
1978-12-19
Dean, R.
Metal treatment
Compositions
Heat treating
148 315, 148 3155, 148122, 75152, 428609, B23K 3524
Patent
active
041304470
ABSTRACT:
An annealing separator for use on grain-oriented silicon steel strip comprises a magnesium oxide base composition containing rare earth metal oxides. The rare earth metal oxides are present in an amount of 0.8 to 30% by weight of the composition; but in the lower range of 0.8 to 5% by weight, and preferably up to 7% by weight, the oxides have a particle size of less than 325 mesh, and a fraction of 35-55% by weight smaller than 500 mesh. Alkali metal silicate may be present in an amount 5 to 45% by weight. Strip coated with annealing separator of the invention is characterized in that the coating is almost totally free of surface cavities, in that the denitriding and desulfuring rates are greatly accelerated, in that the surface resistivity of the coating is substantially increased, and in that the coating adheres more strongly to the strip.
REFERENCES:
patent: 2354123 (1944-07-01), Horstman et al.
patent: 2850381 (1958-09-01), Bolkcom et al.
patent: 3379581 (1968-04-01), Kohler et al.
patent: 3620645 (1971-11-01), Della Porta et al.
patent: 3956029 (1976-05-01), Yamamoto et al.
patent: 3960616 (1976-06-01), Evans et al.
Barisoni Mario
Basevi Sandro
Bitti Roberto Ricci
Borgianni Carlo
Marianeschi Edmondo
Centro Sperimentale Metallurgico S.p.A.
Dean R.
Sheehan John P.
Terni-Societa per l'Industria e l'Elettricita S.p.A.
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