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Steel annealing and pickling method for hot-rolled 430 ferrite stainless steel band

A stainless steel strip and ferrite technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of low surface quality grade, large surface roughness of strip steel, inability to obtain NO.1 surface, etc., to improve the surface quality. The effect of quality grade and yield improvement

Active Publication Date: 2014-06-25
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the finishing rolling process of hot-rolled ultra-pure 430 ferritic stainless steel strip steel, a dense oxide layer will be formed on the surface of the strip steel. It will further thicken. After annealing, it is necessary to use a scale breaker and a shot blasting machine to remove most of the scale on the surface of the strip, and then go through a sulfuric acid pre-pickling + mixed acid pickling process to remove the scale on the surface of the strip. A layer of passivation film is formed on the surface of the strip steel. The production method currently used, because the oxide scale on the surface of the hot-rolled 430 ferritic stainless steel is closely combined with the metal matrix, the oxide scale on the surface of the strip steel is not completely removed during the pickling process, and The surface roughness of the strip steel after pickling is relatively large, and the surface quality level of the strip steel after pickling is low, and a good NO.1 surface cannot be obtained

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0039] The technical scheme of the present invention has more optimized implementation mode as follows:

[0040] More optimally, in step 1) the scaling elongation of the scale breaking machine is controlled between 1.5% and 2.5%.

[0041] More optimally, in step 2) descaling of the shot blasting machine, the shot blasting volume is between 1000-1100kg / min, and the speed of the shot blasting machine is between 2050-2150rpm.

[0042] More optimally, step 3) the concentration of sulfuric acid solution in the sulfuric acid electrolytic pickling tank is between 180-220g / L, the concentration of metal ions is between 35-45g / L, the temperature of the acid solution is between 65-75°C, and the current Between 950 and 1050A, the strip speed is between 40 and 45m / min.

[0043] More optimally, in step 4) the rotational speed of the grinding and brushing motor is between 950-1050 rpm, and the current of the motor is between 310-330A.

[0044] More optimally, step 5) the concentration of s...

Embodiment 1

[0048] After the steel strip is annealed in a bell furnace, the steel strip is scaled by a scale breaker, and the elongation is controlled to be between 1.5%.

[0049] After the scale breaking machine breaks the scale, the strip steel is then descaled by the shot blasting machine. The shot blasting rate is 1000kg / min, and the speed of the shot blasting machine is 2050rpm.

[0050] After descaling by the shot blasting machine, the steel strip passes through a sulfuric acid electrolytic pickling tank, in which the concentration of sulfuric acid solution in the tank is 180g / L, the concentration of metal ions is 35g / L, the temperature of the acid solution is 65°C, and the current is 950A. The strip speed is 40m / min.

[0051] After sulfuric acid electrolytic pickling, then grind and scrub, the motor speed is 950rpm, and the motor current is 310A.

[0052] After grinding and scrubbing, it passes through a sulfuric acid pickling tank, the concentration of sulfuric acid in the tank i...

Embodiment 2

[0057] After the steel strip is annealed in a bell furnace, the steel strip is scaled by a scale breaker, and the elongation is controlled to 2.5%.

[0058] Then the steel strip is descaled by a shot blasting machine, the shot blasting rate is 1100kg / min, and the shot blasting machine speed is 2150rpm.

[0059] After being descaled by the shot blasting machine, the steel strip passes through a sulfuric acid electrolytic pickling tank, in which the concentration of sulfuric acid solution in the tank is 220g / L, the concentration of metal ions is 45g / L, the temperature of the acid solution is 75°C, and the current is 1050A. The strip speed is 45m / min.

[0060] After sulfuric acid electrolytic pickling, and then grinding and scrubbing, the motor speed is 1050rpm, and the motor current is 330A.

[0061] After grinding and scrubbing, it passes through a sulfuric acid pickling tank, the concentration of sulfuric acid in the tank is 320g / L, the concentration of metal ions is 55g / L, t...

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Abstract

The invention discloses a steel annealing and pickling method for a hot-rolled 430 ferrite stainless steel band. The method comprises the following steps: carrying out scale breading on a steel band by using a descaling mill after annealing by a bell-type furnace, and then carrying out descaling on the steel band by using a shot blasting machine; processing the steel band by a sulfuric acid electrolytic pickling tank after descaling by the shot blasting machine; grinding and rinsing after electrolytic pickling by a sulfuric acid; processing by a sulfuric acid pickling tank after grinding and rinsing; processing by a mixing pickling bath after pickling by the sulfuric acid, wherein the metal ion concentration is 10-30g / l, and the metal ion concentration is 5-15g / l after processing by the mixing pickling bath. The annealing temperature, the steel band speed, the ductility, the projection quantity and the rotating speed of the shot blasting machine, the grinding and rinsing rotation speed, the current size and the picking process are effectively adjusted, so that scale on the surface of the steel band is removed, and the surface quality grade of the steel band after pickling is improved, a good surface NO.1 is obtained, and the yield is improved.

Description

technical field [0001] The invention relates to a pickling method for a hot-rolled 430 ferritic stainless steel strip, which belongs to the field of hot-rolled stainless steel annealing and pickling production. Background technique [0002] During the finishing rolling process of hot-rolled ultra-pure 430 ferritic stainless steel strip steel, a dense oxide layer will be formed on the surface of the strip steel. It will further thicken. After annealing, it is necessary to use a scale breaker and a shot blasting machine to remove most of the scale on the surface of the strip, and then go through a sulfuric acid pre-pickling + mixed acid pickling process to remove the scale on the surface of the strip. A layer of passivation film is formed on the surface of the strip steel. The production method currently used, because the oxide scale on the surface of the hot-rolled 430 ferritic stainless steel is closely combined with the metal matrix, the oxide scale on the surface of the st...

Claims

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Application Information

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IPC IPC(8): C21D9/54C25F7/00C25F1/06C23G3/02C23F17/00
Inventor 李勇华胡斯尧陈连龙
Owner WISDRI ENG & RES INC LTD
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