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Plate strip temperature pickling process

A pickling and stripping technology, which is applied in the field of stainless steel pickling, can solve the problems of prolonging the chemical reaction time, lowering the temperature of the stainless steel plate, and reducing the temperature of the stainless steel plate, so as to shorten the pickling time, improve the production efficiency and reduce the production cost Effect

Inactive Publication Date: 2013-09-25
BAOSTEEL SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem in the existing hot-rolled stainless steel plate pickling process is that the average specific heat of water is more than 8 times larger than that of the stainless steel plate. When the water temperature is lower than the temperature of the stainless steel plate, the washing water will take away a large amount of heat, reducing the temperature of the stainless steel plate
The existing hot-rolled stainless steel pickling process, in the pre-washing and rinsing sections, leads to a lower temperature of the stainless steel plate, prolonging the chemical reaction time of the oxide scale on the surface of the stainless steel plate in the pre-pickling and final pickling sections

Method used

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Examples

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example 1

[0044] Example 1: Pickling of 304 hot-rolled stainless steel plate

[0045] The thickness of the steel plate is 10mm, the width is 2000mm, and the length is 8000mm.

[0046] The surface of the hot-rolled stainless steel plate is shot blasted, and then the hot-rolled stainless steel plate is sent to the pre-washing section (cover) through the roller table, and the water temperature is 55~65℃: the hot-rolled stainless steel plate enters the pre-pickling section (cover) after being rinsed. Pre-pickling, the composition of the pre-pickling solution: H 2 SO 4 , 300g / l; Metal ion content in acid: 35g / l, the running speed of the hot-rolled stainless steel plate is maintained at 5m / min, the temperature of the pickling solution is 60℃; after the pre-pickling section (cover), the hot-rolled stainless steel plate Enter the washing section (hood), the water temperature is 40-50℃; after the hot-rolled stainless steel plate exits the washing section (hood), it enters the final pickling section (...

example 2

[0047] Example 2: Pickling of 316L hot rolled stainless steel plate

[0048] The thickness of the steel plate is 20mm, the width is 2200mm, and the length is 6000mm.

[0049] The surface of the hot-rolled stainless steel plate is shot blasted, and then the hot-rolled stainless steel plate is sent to the pre-washing section (cover) through the roller table, and the water temperature is 58~68℃: the hot-rolled stainless steel plate enters the pre-pickling section (cover) after being rinsed. Pre-pickling, the composition of the pre-pickling solution: H 2 SO 4 , 280g / l; metal ion content in acid: 20g / l, the running speed of the hot-rolled stainless steel plate is maintained at 4m / min, the temperature of the pickling solution is 58℃; after the pre-pickling section (cover), the hot-rolled stainless steel plate Enter the washing section (hood), the water temperature is 45~55℃; after the hot-rolled stainless steel plate exits the washing section (hood), it enters the final pickling section ...

example 3

[0050] Example 3: Pickling of S31803 hot-rolled stainless steel plate

[0051] The thickness of the steel plate is 30mm, the width is 1800mm, and the length is 5800mm.

[0052] The surface of the hot-rolled stainless steel plate is shot blasted, and then the hot-rolled stainless steel plate is sent to the pre-washing section (cover) through the roller table, and the water temperature is 65~75: the hot-rolled stainless steel plate enters the pre-pickling section (cover) for pre-washing after being washed Pickling, pre-pickling solution composition: H 2 SO 4 , 320g / l; metal ion content in acid: 19g / l, the running speed of the hot-rolled stainless steel plate is maintained at 0.6m / min, the temperature of the pickling solution is 66℃; after the pre-pickling section (hood), the stainless steel is hot-rolled The plate enters the washing section (hood), and the water temperature is 55-65℃; after the hot-rolled stainless steel plate exits the washing section (hood), it enters the final pic...

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Abstract

The invention discloses a plate strip temperature pickling process, which includes: a shot blasting treatment step, in which shot blasting treatment is carried out on the surface of a stainless steel plate; a pre-washing step, in which water is employed to wash the surface of the stainless steel plate to wash out dust thereon; a pre-pickling step, in which an H2SO4 solution is taken to conduct pre-pickling on the surface of the stainless steel plate so as to wash off residual oxides on the surface of the stainless steel plate; a washing step, in which water is used to wash the surface of the stainless steel plate so as to scour the H2SO4 solution remaining thereon; and a final acidification step, in which a mixed solution of HNO3 and HF is used to carry out pickling on the surface of the stainless steel plate so as to passivate the surface of the stainless steel plate. The process provided in the invention can shorten the pickling time of each steel plate, improve the production efficiency by over 20%, and omits a special passivation treatment procedure, thus significantly reducing the production cost.

Description

Technical field [0001] The invention relates to the technical field of stainless steel pickling, in particular to a strip warm pickling process used for hot-rolling stainless steel plate process oxide scale. Background technique [0002] Hot-rolled stainless steel plate pickling is to use acid solution to carry out surface acid chemical treatment of stainless steel with oxide scale on the surface, remove the oxide layer and chromium-depleted layer formed on the surface of stainless steel during high temperature thermal processing, and passivate simultaneously. Among stainless steel products, the pickling of 300 series stainless steels such as 304, 316L and 321 is the most representative. The 300 series stainless steels are all single-phase austenitic stainless steels. Because they contain more alloying elements such as Cr, Ni, Mo, and Ti, the composition and structure of the oxide scale formed during the hot working process are significantly different from those of carbon steel. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C23G3/02
Inventor 王国富赵欣周庆军秦伟
Owner BAOSTEEL SPECIAL STEEL CO LTD
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