Method and apparatus for degreasing steel strip
AssigneesKawasaki Steel Corporation, Hotani Co., Ltd.
InventorsKazuya Nishizato, Seiichi Takahashi, Hidetoshi Takeda, Setsuo Hotani
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Abstract
A steel strip is degreased with low power consumption by subjecting the steel strip to electrolytic washing in a degreasing apparatus including an electrolytic washing apparatus in which electrodes confront each other across the steel strip located therebetween, and charge density and current density are maintained within a predetermined range. There is also provided a simple steel strip degreasing apparatus which is especially suitable for the method.
Claims10
A method of degreasing a steel strip, comprising electrolytically washing a steel strip under once of the following conditions of electricity density X (C/dm2) and current density Y (A/dm2):
- Y≧0.01×X−2 when X≦0.12;
- and
- Y≧0.7×0.12≦when ≦0.5.
A method of degreasing a steel strip, comprising:
- passing said strip through an electrolytic washing apparatus comprising electrodes which confront each other across said steel strip located therebetween, have a length L (mm) of about 100 to about 0.5 mm in a traveling direction of the steel strip, and satisfy the following formula:
- 500×(S×S)/(60×Y×C)≦L≦1100×(S×X)/(60×Y×C),
- wherein
- S:
- linear speed (m/min) of steel strip;
- X:
- electricity density (C/dm2);
- Y:
- current density (A/dm2);
- and
- C:
- number of electrode pairs.
A method of degreasing a steel strip, comprising passing said strip through an electrolytic washing apparatus comprising electrodes which confront each other across said steel strip located therebetween, have a length L (mm) of about 100 to about 0.5 mm in a traveling direction of the steel strip, and satisfy the following formula:
- 500×(S×X)/(60×Y×C)≦L≦1100×(S×X)/(60×Y×C),
- wherein
- S:
- linear speed (m/min) of steel strip;
- X:
- electricity density (C/dm2);
- Y:
- current density (A/dm2);
- and
- C:
- number of electrode pairs
- said electrolytic washing apparatus further comprising at least one device selected from a brush washing apparatus and a high pressure water washing apparatus.
Dependencies are inferred from the claim text.