Thermal annealing acid-washing method of stainless steel wide and thick plate coil

A stainless steel and thermal annealing technology, applied in the field of metallurgy, can solve problems such as poor surface quality, and achieve the effect of improving product yield, excellent surface quality and material properties, and improving yield.

Active Publication Date: 2013-02-13
ZHANGJIAGANG POHANG STAINLESS STEEL
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  • Abstract
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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the object of the present invention is to provide a continuous thermal annealing and pickling method for stainless steel wide and thick plate coils, by adopting this method, the stainless steel wide and thick plate coils can be avoided as much as possible in the process of continuous thermal annealing and pickling. Strips, poor material, poor surface quality, loose coils, surface scratches, etc., so as to improve the success rate of stainless steel wide and thick plate coils

Method used

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  • Thermal annealing acid-washing method of stainless steel wide and thick plate coil
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  • Thermal annealing acid-washing method of stainless steel wide and thick plate coil

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Embodiment 1

[0024] This embodiment provides a thermal annealing and pickling method for stainless steel wide and thick plate coils. The thickness of the stainless steel wide and thick plate is 16.0mm, the width is 1500mm, and the steel type is SUS304. The thermal annealing and pickling method comprises the following steps:

[0025] Entrance uncoiling of stainless steel wide and thick plate coils;

[0026] Pass the stainless steel wide and thick plate to the welding machine, and use double welding torches for welding. The voltage of the welding current is controlled at 38V, the welding speed is controlled at 0.35m / min, the diameter of the welding wire is 2.0mm, and the initial welding beam groove depth is 1.0mm. In the future, the groove can be polished after wear, and the deepest can not exceed 1.5mm; after the welding is completed, confirm the quality of the weld seam, the quality of the weld seam is intact, the production line is running, and enter the annealing section;

[0027] Anneal...

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Abstract

The invention relates to a thermal annealing acid-washing method of a stainless steel wide and thick plate coil, which comprises the following steps of: uncoiling an inlet of the stainless steel wide and thick plate coil, welding, continuously annealing, breaking scales shot-blasting, acid-washing, flattening, and coiling an outlet of the stainless steel wide and thick plate coil, wherein the groove depth of a welding girder is 1.0-1.5mm; 3-6 annealing furnaces with the total length of 75-150m are adopted in continuous annealing, the annealing temperature is 1000-1150 DEG C, and the annealing time is 10-20min; in the shot blasting process, the blasting speed is 1500-2250rpm, the blasting quantity is 600-100kg/min, and the blasting particle has a grain size of 0.5-0.7mm; and in the acid washing step, acid washing is carried out by adopting mixed acid of hydrofluoric acid and nitric acid in 3-6 sections of grooves. By adopting the method, in a continuous annealing acid-washing process of the stainless steel wide and thick plate coil, problems of strip breakage, poor material property, poor surface quality, reeling off, surface scratching and the like can be avoided as much as possible.

Description

technical field [0001] The invention relates to a thermal annealing and pickling method for stainless steel coils, in particular to a continuous thermal annealing and pickling method for wide and thick stainless steel coils, belonging to the technical field of metallurgy. Background technique [0002] With the development of energy industry and heavy chemical industry, the consumption of wide and thick plates is increasing year by year. In order to meet the demand for wide and thick plates in the manufacture of oil, gas and other energy transmission pipelines and pressure vessels, especially for stainless steel with a thickness of 12.7-20mm and a width of 1500-2000mm, the existing production methods of stainless steel wide and thick plates mainly adopt sheet rolling Production methods of rolling and annealing and coil rolling and continuous annealing. However, the production efficiency of single sheet rolling is low, and the coil rolling efficiency is high, but there are pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C21D9/56C23G1/08B24C1/00
Inventor 刘奇毅张坤杨武勋
Owner ZHANGJIAGANG POHANG STAINLESS STEEL
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