A kind of cold-rolled 430 ferritic stainless steel strip annealing pickling production method

A technology of stainless steel strip and ferrite, applied in the direction of furnace types, furnaces, heat treatment furnaces, etc., can solve the problems of increasing production costs, and achieve the effects of improving efficiency, saving investment, and reducing production costs

Active Publication Date: 2016-03-30
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above problems, the object of the present invention is to provide a cold-rolled 430 ferritic stainless steel strip steel annealing and pickling production method, which aims to solve the technical problem that the existing method requires additional nitric acid electrolytic pickling equipment and increases production costs

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  • A kind of cold-rolled 430 ferritic stainless steel strip annealing pickling production method

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Embodiment 1

[0030] The cold-rolled 430 ferritic stainless steel strip steel annealing pickling production method that present embodiment provides is as follows:

[0031]A1. Send the steel strip into the annealing furnace for annealing treatment, wherein the temperature control of the annealing furnace includes two periods. In the first period, the temperature of the steel strip at the exit of the annealing furnace is 550° C., and the excess oxygen concentration is 5.5%. In the second period, The strip temperature at the exit of the annealing furnace is 840°C, the excess oxygen concentration is 7.5%, and the strip annealing time is 20.6s;

[0032] A2. Send the annealed steel strip into the electrolytic pickling section, wherein the concentration of neutral salt solution is 180g / L, and the concentration of nitric acid is 135g / L. The pH value of the electrolytic acid solution is adjusted by adding sulfuric acid, and the pH value is controlled at 3.3. The metal ion concentration is 6g / L, the ...

Embodiment 2

[0035] The cold-rolled 430 ferritic stainless steel strip steel annealing pickling production method that present embodiment provides is as follows:

[0036] B1. Send the steel strip into the annealing furnace for annealing treatment, wherein the temperature control of the annealing furnace includes two periods. In the first period, the temperature of the steel strip at the exit of the annealing furnace is 570° C., and the excess oxygen concentration is 6.5%. In the second period, The strip temperature at the exit of the annealing furnace is 860°C, the excess oxygen concentration is 8.5%, and the strip annealing time is 46.5s;

[0037] B2, send the annealed steel strip into the electrolytic pickling section, wherein the neutral salt solution concentration is 200g / L, the nitric acid concentration is 145g / L, and the pH value of the electrolytic acid solution is regulated by adding sulfuric acid, and the pH value is controlled at 3.7, The metal ion concentration is 10g / L, the tem...

Embodiment 3

[0040] The cold-rolled 430 ferritic stainless steel strip steel annealing pickling production method that present embodiment provides is as follows:

[0041] C1. Send the steel strip into the annealing furnace for annealing treatment, wherein the temperature control of the annealing furnace includes two periods. In the first period, the temperature of the steel strip at the exit of the annealing furnace is 560° C., and the excess oxygen concentration is 6%; in the second period, The strip steel temperature at the exit of the annealing furnace is 850°C, the excess oxygen concentration is 8%, and the strip steel annealing time is 35s;

[0042] C2, send the annealed steel strip into the electrolytic pickling section, wherein the neutral salt solution concentration is 190g / L, the nitric acid concentration is 140g / L, the pH value of the electrolytic acid solution is regulated by adding sulfuric acid, and the pH value is controlled at 3.5, The metal ion concentration is 8g / L, the te...

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Abstract

The invention is suitable for the technical field of stainless steel production, and provides an annealing-pickling production method of a cold-rolled ferrite 430 stainless steel strip. The method comprises the following steps: annealing treatment, acid electrolysis and pickling, wherein corresponding process parameters need to be set in each step. According to the method, the electrolytic pickling efficiency can be improved by controlling the concentration of excess oxygen at each phase of an annealing furnace, adding a sulfuric acid solution and a nitric acid solution into a neutral salt solution and controlling a PH (Potential Of Hydrogen) value within 3-4, so that chromium oxides, ferric oxides and chromium depletion layers on the surface of the steel strip are completely removed after the electrolytic pickling is carried out; meanwhile, the annealing-pickling line which only can be used for producing FeCrNi-series cold-rolled stainless steel can be used for producing the cold-rolled ferrite 430 stainless steel strip.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled stainless steel production, and in particular relates to an annealing and pickling production method of cold-rolled 430 ferritic stainless steel strip. Background technique [0002] At present, when the cold-rolled 430 ferritic stainless steel strip is annealed, the excess oxygen concentration in each heating section in the furnace is basically the same, generally between 3% and 8%. , so that the pickling time required for the follow-up is longer, and it will also reduce the surface quality of the strip after pickling. [0003] After annealing, the pickling process of cold-rolled 430 (FeCr series stainless steel) ferritic stainless steel generally adopts the process of neutral salt electrolytic pickling and nitric acid electrolytic pickling. The surface of 430 stainless steel strip is generally dominated by iron oxides, chromium oxide However, neutral salt electrolytic pickling has a better r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/54C21D1/26C25F1/06
Inventor 李勇华胡斯尧陈连龙
Owner WISDRI ENG & RES INC LTD
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