Annealing and pickling method of hot-rolled 436l ultra-pure ferritic stainless steel strip

A stainless steel strip and ultra-pure iron technology, applied in the direction of grinding machines, grinding/polishing equipment, manufacturing tools, etc., can solve the problems of unclean removal, failure to obtain No.1 surface, large surface roughness of strip steel, etc., and achieve improvement Effect of Surface Quality Class

Active Publication Date: 2016-03-30
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 436L ultra-pure ferritic stainless steel strip steel, a dense oxide layer will be formed on the surface of the strip steel. After annealing in a continuous annealing furnace, the thickness of the oxide layer will become thicker. , 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 sulfuric acid pre-pickling + mixed acid pickling process to remove the scale on the surface of the strip and form a dull layer on the surface of the strip. Chemical film, the current production method, in the pickling process, the oxide scale on the surface of the strip is not cleanly removed, and the surface roughness of the strip after pickling is relatively large, which reduces the surface quality level of the strip and cannot obtain a good NO.1 surface

Method used

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Comparison scheme
Effect test

Embodiment approach

[0037] The technical scheme of the present invention has more optimized implementation mode as follows:

[0038] More optimally, in step 1) the scaling elongation of the scale breaking machine is controlled between 1.5% and 2.5%.

[0039] 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 2050rpm and 2150rpm.

[0040] More optimally, step 3) the sulfuric acid solution concentration in the sulfuric acid electrolytic pickling tank is between 140-160 g / L, the metal ion concentration is between 35-45 g / L, the acid solution temperature is between 65-75°C, with The steel speed is between 45 and 50m / min.

[0041] More optimally, step 4) the rotation speed of the grinding and scrubbing motor is between 950-1050 rpm, and the motor current is between 180-200A.

[0042] More optimally, step 5) the concentration of sulfuric acid in the sulfuric acid pickling tank is...

Embodiment 1

[0046] The strip steel after annealing is broken by a scale breaker, and the elongation is controlled at 1.5%.

[0047] Then the steel strip is descaled by a shot blasting machine, the shot blasting rate is 1000kg / min, and the speed of the shot blasting machine is 2050rpm.

[0048] After descaling by the shot blasting machine, the strip steel passes through a sulfuric acid electrolytic pickling tank, in which the concentration of sulfuric acid solution in the tank is 140g / L, the concentration of metal ions is 35g / L, the temperature of the acid solution is 65°C, and the strip steel speed is 45m / min.

[0049] After sulfuric acid electrolytic pickling, then grind and scrub, the motor speed is 950rpm, and the motor current is 180A.

[0050] After grinding and scrubbing, it passes through a sulfuric acid pickling tank, the concentration of sulfuric acid in the tank is 240g / L, the concentration of metal ions is 45g / L, the temperature of the acid solution is 75°C, and the strip speed...

Embodiment 2

[0055] The strip steel after annealing is broken by a scale breaker, and the elongation is controlled at 2.5%.

[0056] 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.

[0057] After being descaled by the shot blasting machine, the strip passes through a sulfuric acid electrolytic pickling tank, in which the concentration of sulfuric acid solution in the tank is 160g / L, the concentration of metal ions is 45g / L, the temperature of the acid solution is 75°C, and the strip speed is 50m / min.

[0058] After sulfuric acid electrolytic pickling, then grind and scrub, the motor speed is 1050rpm, and the motor current is 200A.

[0059] After grinding and scrubbing, it passes through a sulfuric acid pickling tank, the concentration of sulfuric acid in the tank is 260g / L, the concentration of metal ions is 55g / L, the temperature of the acid solution is 85°C, and the strip speed is 50m / min...

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Abstract

The invention discloses an annealing-pickling production method for hot-rolled 436 L ultra-pure ferrite stainless strip steel. The annealing-pickling production method comprises the following steps: annealing the strip steel in a horizontal-type continuous annealing furnace; carrying out scale breaking on the strip steel by a scale breaking machine, and controlling the ductility to be between 1% to 3%; descaling by use of a shot blasting machine; passing through a sulphuric acid electrolysis pickling bath; carrying out grinding-scrubbing; passing through a sulphuric acid pickling bath; passing through a mixed pickling bath after sulphuric acid pickling; then passing through a mixed pickling bath again. Scale on the surface of the strip steel can be thoroughly removed by effectively adjusting the annealing temperature, the speed of the strip steel, the ductility, the blasting amount and rotational speed of the shot blasting machine, the rotational speed and current of a grinding-scrubbing machine, and using the pickling process, thus improving the surface quality grade of the strip steel after pickling and obtaining the good No. 1 surface.

Description

technical field [0001] The invention relates to a hot-rolled 436L ultra-pure ferritic stainless steel strip steel annealing and pickling production method, 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 436L ultra-pure ferritic stainless steel strip steel, a dense oxide layer will be formed on the surface of the strip steel. After annealing in a continuous annealing furnace, the thickness of the oxide layer will become thicker. , 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 sulfuric acid pre-pickling + mixed acid pickling process to remove the scale on the surface of the strip and form a dull layer on the surface of the strip. Chemical film, the current production method, in the pickling process, the oxide scale on the surface of the strip is not cleanly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/08C25F1/06B24B27/033B24C1/08
Inventor 李勇华胡斯尧陈连龙
Owner WISDRI ENG & RES INC LTD
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