Method of pretreating cold rolled sheet to minimize annealing st

Details Method of pretreating cold rolled sheet to minimize annealing st Method of pretreating cold rolled sheet to minimize annealing st

1985-06-17

1986-04-15

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

148 12R, 148 12C, 148 12D, 148 18, 134 2, 134 40, 2041415, 204145R, C21D 100

Patent

active

045825467

ABSTRACT:
In the box annealing of steel sheet, the tendency for adjacent wraps of the sheet to pressure weld (stick) is decreased or eliminated by passing the sheet, prior to annealing, through a rinse containing from 1,500 to 10,000 ppm of the magnesium or calcium salts of soluble carboxylic acids--preferably formates. Further benefits are realized if the sheet is electro-cleaned with a silicate containing cleaning solution, and thereafter rinsed in the formate solution whereby the latter acts to fix the concentration of silicates remaining on the surface of the sheet.

REFERENCES:
patent: 3796645 (1974-03-01), Fujita et al.
patent: 3919000 (1975-11-01), Yarrington
patent: 3950572 (1976-04-01), Ayusawa et al.
patent: 4035256 (1977-07-01), Brendlinger et al.
patent: 4120702 (1978-10-01), Akerblom
Lange's Handbook of Chemistry, Twelfth Edition, McGraw-Hill Book Co., N.Y., 1979, pp. 2-27.

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