A kind of passivation method of corrosion-resistant steel for high-purity pipe

A kind of corrosion-resistant steel, pure technology, applied in the direction of metal material coating process, etc., can solve the problems of passivation layer density, thickness, limited number of layers, increased indirect cost loss, short service life of pipes, etc., to reduce electropolishing effect of time, promotion of preferential oxidation, and improvement of service life

Active Publication Date: 2022-07-12
湖州合创金属材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the stainless steel materials serving in dusty and corrosive working environments such as high-clean pipes at home and abroad are made of chromium-nickel alloy steel 316L, etc., and the passivation process is conventional pickling passivation. In the previous heat treatment, dusting corrosion occurred, and some corrosion products remained during the pickling and passivation process, which caused the pipe wall to fall off during use and affect the purity of the transported gas or liquid.
In addition, in the conventional pickling passivation, the density, thickness and number of layers of the passivation layer are limited, and the anti-air infiltration performance needs to be improved, resulting in a short service life of the pipe, and frequent replacements cause a secondary increase in the cost of the user. Moreover, the indirect cost increase caused by the decrease in the purity of the transported gas is even greater.

Method used

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  • A kind of passivation method of corrosion-resistant steel for high-purity pipe
  • A kind of passivation method of corrosion-resistant steel for high-purity pipe
  • A kind of passivation method of corrosion-resistant steel for high-purity pipe

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Effect test

Embodiment 1

[0053] A passivation method for high-purity pipe 0Cr15Ni10MnMoWTiAlSc corrosion-resistant steel, comprising the following steps:

[0054] (1) Pre-passivation treatment: put the corrosion-resistant steel into a bright annealing furnace for heating, when the furnace temperature reaches 190 °C, start to pass cooling water; when the furnace temperature reaches 490 °C, pass nitrogen gas, and clean the furnace; when the furnace temperature reaches 530 °C When the temperature is ℃, oxygen is introduced into the furnace until the atmosphere in the furnace contains 23% oxygen, and the temperature is kept for 15 minutes, wherein the heating rate is 3 ℃ / min;

[0055] (2) Bright annealing treatment: after the pre-passivation treatment, hot nitrogen gas was introduced to clean the furnace chamber, and then ammonia decomposition gas was introduced to maintain the pressure in the furnace at 0.2MPa; the heating rate was controlled to be 3°C / min, and the temperature was increased to 1080°C. , ...

Embodiment 2

[0061] A passivation method for high-purity pipe 0Cr15Ni10MnMoWTiAlSc corrosion-resistant steel, comprising the following steps:

[0062] (1) Pre-passivation treatment: put the corrosion-resistant steel into a bright annealing furnace for heating, when the furnace temperature reaches 200 °C, start to pass cooling water; when the furnace temperature reaches 497 °C, pass nitrogen gas, and clean the furnace; when the furnace temperature reaches 540 At ℃, oxygen is introduced into the furnace until the atmosphere in the furnace contains 24% oxygen, and the temperature is kept for 17 minutes, wherein the heating rate is 5 ℃ / min;

[0063] (2) Bright annealing treatment: after the pre-passivation treatment, hot nitrogen gas is introduced to clean the furnace, and then ammonia decomposition gas is introduced to maintain the pressure in the furnace at 1.5MPa; the heating rate is controlled to be 4 °C / min, and the temperature is increased to 1100 °C After the heat preservation is comple...

Embodiment 3

[0069] A passivation method for high-purity pipe 0Cr15Ni10MnMoWTiAlSc corrosion-resistant steel, comprising the following steps:

[0070](1) Pre-passivation treatment: put the corrosion-resistant steel into a bright annealing furnace for heating, when the furnace temperature reaches 210 °C, start to pass cooling water; when the furnace temperature reaches 505 °C, pass nitrogen gas, and clean the furnace; when the furnace temperature reaches 550 °C When the temperature is ℃, oxygen is introduced into the furnace until the atmosphere in the furnace contains 25% oxygen, and the temperature is kept for 20 minutes, wherein the heating rate is 7 ℃ / min;

[0071] (2) Bright annealing treatment: after the pre-passivation treatment, hot nitrogen gas was introduced to clean the furnace, and then ammonia decomposition gas was introduced to maintain the pressure in the furnace at 2.5MPa; the heating rate was controlled to be 5°C / min, and the temperature was increased to 1120°C After the he...

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Abstract

The invention belongs to the technical field of corrosion prevention of stainless steel pipes, and in particular relates to a passivation method for corrosion-resistant steel for high-purity pipes. A high-purity tube with 0Cr 15 Ni 10 The MnMoWTiAlSc corrosion-resistant steel passivation method includes the following steps: pre-passivation treatment, bright annealing treatment, electrolytic treatment, and solution passivation treatment. The passivation method of the present invention can make 0Cr 15 Ni 10 MnMoWTiAlSc alloy products have good anti-breathing properties and anti-dusting corrosion properties. The service life is more than 0.5 times higher than that of the ordinary passivation 0Cr15Ni10MnMoWTiAlSc ultra-pure pipe alloy in the same high-purity special gas working environment.

Description

technical field [0001] The invention belongs to the technical field of corrosion prevention of stainless steel pipes, and in particular relates to 0Cr for high-purity pipes 15 Ni 10 MnMoWTiAlSc corrosion resistant steel passivation method. Background technique [0002] In recent years, the production of microelectronic products represented by large-scale integrated circuits has increasingly strict requirements on the purity and impurity content of high-purity gases. In the semiconductor industry, the line width is getting smaller and smaller. , The requirements for dew point are also getting higher and higher, and the piping technology of high-purity gas has been paid more and more attention and attention. In the semiconductor industry and the biopharmaceutical industry, high-purity or ultra-pure clean gas needs to be transported to the point of use (POU) through pipelines. In order to meet the quality requirements of the process for the gas, when the gas outlet index is c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D1/26C21D1/74C23C22/50C25F3/24C23F17/00
CPCC21D6/00C21D1/26C21D1/74C25F3/24C23C22/50C23F17/00
Inventor 杜晓东孙建张真邱明坤成天东
Owner 湖州合创金属材料有限公司
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