Method for continuous annealing and pickling of stainless steel band

A stainless steel strip and pickling technology, which is applied to furnace types, furnaces, heat treatment furnaces, etc., can solve the problems of long pickling time, low pickling efficiency, and poor pickling effect

Active Publication Date: 2017-11-03
SICHUAN TIANHONG STAINLESS STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a production method for annealing and pickling of stainless steel strips, aiming to solve the technical problems of longer pickling time, poor pickling effect and low pickling efficiency in the existing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Test object: SUS304, the annealing and pickling method of the stainless steel strip, including the following steps:

[0024] ⑴, open book;

[0025] (2) Alkali cleaning: the steel strip uncoiled in step (1) is sent to the alkali washing tank at a speed of 10 to 15 m / min under a tension of 1100 to 1250 kg. The temperature of the alkali washing liquid in the alkali washing tank is 42 ° C. The pH value of the lotion is 8.5-9.2;

[0026] (3) Annealing: Send the steel strip after step (2) alkali washing into the annealing furnace at a speed of 12-16m / min under a tension of 530-600kg for annealing treatment, wherein the temperature of the annealing furnace is set to 8 sections, from From the entrance to the exit, the temperature increases from 820°C to 960°C, and the excess oxygen concentration increases from 3% to 5%;

[0027] (4) Electrolysis: after step (3) is annealed, it is sent to the electrolytic pickling solution for electrolysis, and the electrolytic pickling soluti...

Embodiment 2

[0036] Test object: 409L, the annealing and pickling method of the stainless steel strip, including the following steps:

[0037] ⑴ Open book;

[0038] (2) Alkali cleaning: the steel strip uncoiled in step (1) is sent to the alkali washing tank at a speed of 10 to 15 m / min under a tension of 1100 to 1250 kg. The temperature of the alkali washing liquid in the alkali washing tank is 50 ° C. The pH value of the lotion is 8.5-9.2;

[0039] (3) Annealing: Send the steel strip after step (2) alkali washing into the annealing furnace at a speed of 12-16m / min under a tension of 530-600kg for annealing treatment, wherein the temperature of the annealing furnace is set to 8 sections, from From the entrance to the exit, the temperature increases from 820°C to 960°C, and the excess oxygen concentration increases from 3% to 5%;

[0040] (4) Electrolysis: after step (3) is annealed, it is sent to the electrolytic pickling solution for electrolysis, and the electrolytic pickling solution ...

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PUM

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Abstract

The invention discloses a method for continuous annealing and pickling of a stainless steel band. The method mainly comprises the following steps that uncoiling is conducted; alkali wash is conducted, specifically, the temperature of alkali wash water is 42 DEG C-50 DEG C, and the PH value of the alkali wash water is 8.5-9.2; annealing is conducted, specifically, the temperature of an annealing furnace is set into eight sections, the temperature from an inlet to an outlet is sequentially and gradually increased from 820 DEG C to 960 DEG C, and the excessive oxygen concentration is sequentially increased from 3% to 5%; electrolysis is conducted, specifically, a electrolytic pickling solution comprises a neutral salt solution, silicic acid, nitric acid and one or more surfactant solutions; pickling is conducted, specifically, the pickling concentration is 150-170 g/L, the metal ion concentration is 50-60 g/L, and the temperature is 65-70 DEG C; first mixed pickling is conducted, specifically, the concentration of the nitric acid is 120-140 g/L, and the concentration of hydrofluoric acid is 35-50 g/L; second mixed pickling is conducted, specifically, the concentration of nitric acid is 130-140 g/L, and the concentration of hydrofluoric acid is 40-50 g/L; and wash cooling is conducted. By adoption of the method, iron oxides in an oxide skin can be effectively removed, the pickling time is greatly shortened, and the pickling effect is good.

Description

technical field [0001] The invention relates to a continuous annealing and pickling method for stainless steel strips. Background technique [0002] Stainless steel strips have been widely used in industries such as petroleum, chemical industry, salt industry, water conservancy and electric power. In the production process of stainless steel strip, annealing and pickling process is required. [0003] At present, when cold-rolled stainless steel strip is annealed, the uncoiled steel strip is usually sent directly into the annealing furnace through the tensioner. Due to the impurities such as oil on the surface of the steel strip, and the excess oxygen concentration in each heating section in the furnace It is basically the same, which makes the scale composition of the steel strip surface complex after annealing, so that the subsequent pickling time is longer, and to a certain extent, the quality of the surface of the steel strip after pickling is also reduced. [0004] Aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D1/26C23G1/08C25F1/06
CPCC21D1/26C21D9/52C23G1/08C25F1/06
Inventor 瞿坤
Owner SICHUAN TIANHONG STAINLESS STEEL
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