Continuous treatment of steel sheet

Details Continuous treatment of steel sheet Continuous treatment of steel sheet

1981-04-28

1983-06-21

Smith, William F.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 10, 134 13, 134 15, 134 27, 134 28, 134 41, 210759, C23G 108

Patent

active

043892540

ABSTRACT:
Steel sheet is subjected to a thermal treatment as a result of which an oxide layer is formed. The sheet is pickled by contact with an organic acid solution (formic acid), containing at least 50 mg/l of iron, at a pH of 1.5 to 4 and at a temperature above a minimum value T.sub.m given by T.sub.m =20+(pH-1.5)32.

REFERENCES:
patent: 1269443 (1918-06-01), Hoffman
patent: 3011907 (1961-12-01), Davis
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patent: 3310435 (1967-03-01), Robinson, Jr. et al.
patent: 3330769 (1967-07-01), Golben
patent: 3630933 (1971-12-01), Dudlik et al.
patent: 3796628 (1974-03-01), Sen
patent: 3819516 (1974-06-01), Murchison et al.
patent: 3905907 (1975-09-01), Shiga

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