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A kind of production method of annealing and pickling of 409l cold-rolled steel strip

A technology of cold-rolled strip steel and pickling, which is 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 saving investment, reducing production costs, and reducing the formation of oxide scales

Active Publication Date: 2016-06-01
WISDRI ENG & RES INC LTD
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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 cold-rolled steel strip 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

Method used

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  • A kind of production method of annealing and pickling of 409l cold-rolled steel strip

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Effect test

Embodiment 1

[0028] The annealing and pickling production method of 409L cold rolled strip steel provided in this embodiment is as follows:

[0029] A1. Send the strip steel to the annealing furnace for annealing treatment. The temperature control of the annealing furnace includes two periods. In the first period, the temperature of the strip at the exit of the annealing furnace is 660°C and the excess oxygen concentration is 5.5%; in the second period, The strip temperature at the exit of the annealing furnace is 950℃, the excess oxygen concentration is 7.5%, and the strip annealing time is 21s;

[0030] A2. Send the annealed strip steel into a neutral salt solution for electrolysis, where the concentration of the neutral salt solution is 180g / L, the metal ion concentration is 6g / L, the temperature is 85℃, and the current density is 19A / dm 3 ; The electrolysis time is 33s;

[0031] A3. Carry out mixed acid pickling of strip steel after electrolysis treatment. The concentration of nitric acid in ...

Embodiment 2

[0033] The annealing and pickling production method of 409L cold rolled strip steel provided in this embodiment is as follows:

[0034] B1. Send the strip steel to the annealing furnace for annealing treatment. The temperature control of the annealing furnace includes two periods. In the first period, the temperature of the strip at the exit of the annealing furnace is 680°C and the excess oxygen concentration is 6.5%; in the second period, The temperature of the strip at the exit of the annealing furnace is 970°C, the excess oxygen concentration is 8.5%, and the strip annealing time is 46.5s.

[0035] B2. Send the annealed steel strip into a neutral salt solution for electrolysis, where the concentration of the neutral salt solution is 220g / L, the metal ion concentration is 10g / L, the temperature is 90℃, and the current density is 21A / dm 3 ; The electrolysis time is 37s;

[0036] B3. Carry out mixed acid pickling for strip steel after electrolysis treatment. The concentration of nit...

Embodiment 3

[0038] The annealing and pickling production method of 409L cold rolled strip steel provided in this embodiment is as follows:

[0039] C1. The strip steel is sent to the annealing furnace for annealing treatment. The temperature control of the annealing furnace includes two periods. In the first period, the temperature of the strip at the exit of the annealing furnace is 670℃ and the excess oxygen concentration is 6%; in the second period, The strip temperature at the exit of the annealing furnace is 957℃, the excess oxygen concentration is 8%, and the strip annealing time is 35s;

[0040] C2. Send the annealed steel strip into a neutral salt solution for electrolysis, where the concentration of the neutral salt solution is 200g / L, the metal ion concentration is 8g / L, the temperature is 87℃, and the current density is 20A / dm 3 ; The electrolysis time is 35s;

[0041] C3. Carry out mixed acid pickling of strip steel after electrolysis treatment. The concentration of nitric acid in th...

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Abstract

The invention is applied in the technical field of stainless steel production, and provides an annealing and acid washing production method for 409L cold-rolled strip steel. The method comprises the steps of annealing treatment, electrolysis and acid washing, wherein corresponding process parameters need to be set in each step. By setting the process parameters, the 409L strip steel does not need to be treated by a nitric acid electrolysis and acid washing process, the 409L cold-rolled strip steel is directly annealed and acid-washed on a FeCrNi series cold-rolled stainless steel annealing and acid washing line, and the surface of the strip steel is flat enough after annealing and acid washing, so that the investment and production cost can be saved.

Description

Technical field [0001] The invention belongs to the technical field of stainless steel production, and particularly relates to an annealing and pickling production method for 409L cold rolled strip steel. Background technique [0002] At present, the pickling process of 409L cold-rolled stainless steel generally uses neutral salt electrolytic pickling plus nitric acid electrolytic pickling; however, in the cold-rolled stainless steel annealing and pickling lines built in some factories, the pickling process is neutral salt electrolytic acid Washing and mixed acid pickling process can only produce FeCrNi cold-rolled stainless steel, not 409L cold-rolled stainless steel. [0003] Now the price of Ni on the market is getting higher and higher, leading to higher and higher production costs of FeCrNi cold-rolled stainless steel. In order to reduce production costs, more and more manufacturers have reduced the content of carbon and nitrogen in 409L stainless steel and added Some alloyin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/08C23G3/02C21D9/56C25F1/06
Inventor 李勇华尚志广胡斯尧陈连龙
Owner WISDRI ENG & RES INC LTD
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