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Plate with-temperature mixed-acid pickling process used for stainless steel plate

A technology for stainless steel plates and strips, applied in the direction of manufacturing tools, metal processing equipment, workpiece surface treatment equipment, etc., can solve the problems of reducing the temperature of stainless steel plates, improve production efficiency, save passivation treatment procedures, and pickling time The effect of shortening

Inactive Publication Date: 2013-12-18
宝钢特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The main problem of the existing hot-rolled stainless steel plate pickling process is that the specific heat capacity of water is more than 8 times larger than the average specific heat capacity of the stainless steel plate. If the water temperature is lower than the temperature of the stainless steel plate, the medium water will take away a large amount of heat from the steel plate and reduce the temperature of the stainless steel plate. temperature

Method used

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  • Plate with-temperature mixed-acid pickling process used for stainless steel plate

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Effect test

Embodiment 1

[0034] Embodiment 1: Pickling of 304 hot-rolled stainless steel plates

[0035] The thickness of the steel plate is 9mm, the width is 1900mm, and the length is 6000mm.

[0036] The surface of the hot-rolled stainless steel plate is subjected to shot blasting treatment, and then the hot-rolled stainless steel plate is sent to the pre-washing section (hood) through the roller table. After emptying, the running speed of the hot-rolled stainless steel plate is kept at 4.5m / min; After the washing section (hood), it enters the final pickling section (hood) for pickling. The acid composition is: HNO 3 288g / l, HF 38g / l, metal ion content in acid 38g / l, temperature 40°C, running speed of hot-rolled stainless steel plate kept at 4.5m / min; Final cleaning, air curtain blowing, drying, and pickling are completed.

Embodiment 2

[0037] Embodiment 2: Pickling of 316L hot-rolled stainless steel plate

[0038] The thickness of the steel plate is 22mm, the width is 1900mm, and the length is 6800mm.

[0039] The surface of the hot-rolled stainless steel plate is subjected to shot blasting treatment, and then the hot-rolled stainless steel plate is sent to the pre-washing section (hood) through the roller table. After emptying, the running speed of the hot-rolled stainless steel plate is kept at 4.0m / min; After the washing section (hood), it enters the final pickling section (hood) for pickling. The acid composition is: HNO 3 268g / l, HF 45g / l, metal ion content in acid 36g / l, temperature 45°C, running speed of hot-rolled stainless steel plate kept at 4.0m / min; Final cleaning, air curtain blowing, drying, and pickling are completed.

Embodiment 3

[0040] Embodiment 3: Pickling of S31803 hot-rolled stainless steel plate

[0041] The thickness of the steel plate is 30mm, the width is 1800mm, and the length is 5800mm.

[0042] The surface of the hot-rolled stainless steel plate is subjected to shot blasting treatment, and then the hot-rolled stainless steel plate is sent to the pre-washing section (hood) through the roller table. The acid composition is: HNO 3 228g / l, HF86g / l, metal ion content in acid 36g / l, temperature 45°C, running speed of hot-rolled stainless steel plate kept at 0.6m / min; In the washing section (hood), the water temperature is 55~65°C; after the hot-rolled stainless steel plate exits the washing section (hood), it enters the final pickling section (hood) for pickling. The acid composition is: HNO 3 298g / l, HF 40g / l, metal ion content in acid 39g / l, temperature 40°C, running speed of hot-rolled stainless steel plate kept at 0.6m / min; after the hot-rolled stainless steel plate leaves the final picklin...

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Abstract

The invention provides a plate with-temperature mixed-acid pickling process used for a stainless steel plate. The process includes shot blasting, pre-flushing, pre-pickling, flushing and final pickling; flushing mediums in the pre-flushing process and the flushing process are water at 40-65 DEG C; the pre-pickling process adopts a mixed solution of HNO3 and HF as a pickling solution, content of HNO3 is 180-290g / l, the content of HF is 26-60g / l, the content of metal ions is 5-45g / l, temperature of the mixed solution is 35-50 DEG C, and operating speed of the stainless steel plate in the pre-pickling process is 0.6-4.5m / min; the final pickling process adopts a mixed solution of HNO3 and HF as a pickling solution, the content of HNO3 is 180-320g / l, the content of HF is 26-89g / l, the content of metal ions is 5-45g / l, the temperature of the mixed solution is 35-50 DEG C, and the operating speed of the stainless steel plate in the final pickling process is 0.6-3.5m / min. High-temperature water is adopted for flushing, shot blasting and pickling are performed on a same roller way continuous production line, and online quick continuous pickling of the stainless steel plate is realized. Compared with the prior art, the plate with-temperature mixed-acid pickling process has the advantage that pickling time is substantially reduced.

Description

technical field [0001] The invention relates to the technical field of stainless steel pickling, in particular to a warm-mixed acid pickling process for hot-rolled stainless steel plate process scale. Background technique [0002] Hot-rolled stainless steel will form an oxide layer and a chromium-poor layer on the surface of the stainless steel during high-temperature thermal processing. Therefore, it is necessary to carry out acid chemical treatment of the stainless steel surface oxide scale through an acid solution, that is, a pickling process, to remove the oxide layer and chromium-poor layer on the stainless steel surface. layer, and simultaneously passivate the surface of the stainless steel. [0003] Among stainless steel products, the pickling process of 300 series stainless steel 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 C...

Claims

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Application Information

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IPC IPC(8): B21B45/02C23G1/08
Inventor 王国富周庆军吴成军
Owner 宝钢特钢有限公司
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