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Continuous steel-strip degreasing method

A steel strip and electrolytic degreasing technology, which is applied in the field of steel strip processing, can solve the problems of low continuous degreasing efficiency of steel strips and difficult to achieve steel strips, and achieve the effect of obvious improvement of product quality, improvement of degreasing efficiency and obvious effect.

Active Publication Date: 2015-08-26
CISDI ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this process is very short in the continuous production line, only 3 to 5 seconds, it is difficult for the temperature of the oil on the steel strip and its surface to reach the temperature we want, especially in winter when the temperature is low. One of the main reasons for the low efficiency of continuous degreasing

Method used

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  • Continuous steel-strip degreasing method
  • Continuous steel-strip degreasing method
  • Continuous steel-strip degreasing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The steel belt is heated by hot air convection, such as figure 2 As shown: the hot air box 2 for preheating the steel strip 1 is set in front of the steel strip continuous degreasing equipment 3, the steel strip 1 passes through the hot air box 2 and the steel strip continuous degreasing equipment 3 in turn, and the hot air box 2 is set up and down correspondingly, respectively Hot air is sprayed on the upper and lower surfaces of the steel strip 1 to heat the steel strip 1 to 100°C to 120°C, and the heated steel strip 1 enters the steel strip continuous degreasing equipment 3 for degreasing. In this embodiment, hot air is used to preheat the steel strip 1, which has no pollution, high cleanliness and low cost.

Embodiment 2

[0022] Using roller contact heating steel belt, such as image 3 Shown: the heating roller 4 used for preheating the steel strip 1 is set in front of the steel strip continuous degreasing equipment 3, there are several sets of heating rollers 4, the steel strip 1 is wound on each heating roller 4 in turn, and the heating roller 4 passes through the set The heating source 5 in the roller raises the temperature of the steel strip 1 to 120° C. to 150° C., and the heated steel strip 1 enters the steel strip continuous degreasing equipment 3 for degreasing. It should be noted that the heating source 5 in this embodiment can be hot exhaust gas, air, or other electric or gas heating devices.

Embodiment 3

[0024] The steel strip is heated by electromagnetic induction, such as Figure 4 As shown: the electromagnetic induction heater 6 for preheating the steel strip 1 is set before the continuous strip degreasing equipment 3, and the steel strip 1 passes through the electromagnetic induction heater 6 and the continuous strip degreasing equipment 3 successively, and the electromagnetic induction heater 6. The steel strip 1 is heated to 110° C. to 140° C., and the heated steel strip 1 enters the steel strip continuous degreasing equipment 3 for degreasing. In this embodiment, an electromagnetic induction coil is used to preheat the steel strip 1 , which has high heating efficiency and is hygienic and clean, and will not have adverse effects on the subsequent degreasing process.

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Abstract

The invention discloses a continuous steel-strip degreasing method. The continuous steel-strip degreasing method comprises the steps of soaking in alkali liquor, washing with the alkali liquor, electrolytic degreasing, derusting with acid liquor, washing with fresh water and rinsing with fresh water. A steel strip is subjected to oil fouling viscosity reduction in advance before being soaked in the alkali liquor, so that the oil fouling and alkali liquor infiltration capability is improved, accordingly, the oil fouling removal efficiency in the follow-up procedures is improved, and finally, the integral degreasing efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of steel strip processing, and in particular relates to a continuous degreasing method for steel strips. Background technique [0002] In the process of continuous hot-dip galvanizing and annealing of steel strips, there is a degreasing process called pretreatment or pretreatment. The degreasing process uses cleaning methods to remove oil stains, Iron filings and dust, etc., so that the steel belt can obtain a fully clean surface. [0003] At present, the technological process used in the degreasing step in the industry mainly includes: lye soaking, lye scrubbing, electrolytic degreasing, acid solution rust removal, water scrubbing and water rinsing. However, a large number of production practices have proved that the efficiency of degreasing using the aforementioned process is not only low, but also the residual impurities on the surface of the steel strip are still high, which is difficult to meet the nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/19C25F1/00
Inventor 许秀飞杜江
Owner CISDI ENG CO LTD
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