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Corrosion-resistant steel passivation method for high-purity pipe

A 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, indirect cost increase loss, short service life of pipes, etc., to reduce electrolytic polishing time, promotion of preferential oxidation, and life-enhancing effects

Active Publication Date: 2021-07-13
湖州合创金属材料有限公司
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  • Summary
  • 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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  • Corrosion-resistant steel passivation method for high-purity pipe

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Effect test

Embodiment 1

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

[0054] (1) Pre-passivation treatment: heat the corrosion-resistant steel in a bright annealing furnace. 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; ℃, feed oxygen into the furnace until the atmosphere in the furnace contains 23% oxygen, keep warm for 15 minutes, and the heating rate is 3 ℃ / min;

[0055] (2) Bright annealing treatment: After pre-passivation treatment, clean the furnace chamber with hot nitrogen gas, and then pass through ammonia decomposition gas to maintain the pressure in the furnace at 0.2MPa; control the heating rate to 3°C / min, and heat up to 1080°C , heat preservation for 30 minutes; after the heat preservation is over, first cut off the power to cool down. After the furnace temperature drops to 800°C, replace ...

Embodiment 2

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

[0062] (1) Pre-passivation treatment: heat the corrosion-resistant steel in a bright annealing furnace. 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; ℃, feed oxygen into the furnace until the atmosphere in the furnace contains 24% oxygen, keep warm for 17 minutes, and the heating rate is 5 ℃ / min;

[0063] (2) Bright annealing treatment: After the pre-passivation treatment, pass hot nitrogen gas to clean the furnace chamber, and then pass ammonia decomposition gas to maintain the pressure in the furnace at 1.5MPa; control the heating rate to 4°C / min, and raise the temperature to 1100°C After that, keep warm for 45 minutes; after the heat preservation is over, first cut off the power to cool down. After the furnace temperature drops to ...

Embodiment 3

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

[0070](1) Pre-passivation treatment: heat the corrosion-resistant steel in a bright annealing furnace. 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; At ℃, oxygen is introduced into the furnace until the atmosphere in the furnace contains 25% oxygen, and the temperature is kept for 20 minutes, and the heating rate is 7 ℃ / min;

[0071] (2) Bright annealing treatment: After the pre-passivation treatment, pass hot nitrogen to clean the furnace chamber, and then pass ammonia decomposition gas to maintain the pressure in the furnace at 2.5MPa; control the heating rate to 5°C / min, and raise the temperature to 1120°C After that, keep warm for 60 minutes; after the heat preservation is over, first cut off the power to cool down. After the furn...

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Abstract

The invention belongs to the technical field of stainless steel pipe corrosion prevention, and particularly relates to a corrosion-resistant steel passivation method for a high-purity pipe. The 0Cr15Ni10MnMoWTiAlSc corrosion-resistant steel passivation method for the high-purity pipe includes the steps of pre-passivating treatment, bright annealing treatment, electrolytic treatment and solution passivating treatment. According to the disclosed corrosion-resistant steel passivation method for the high-purity pipe, a 0Cr15Ni10MnMoWTiAlSc alloy product has good inspiration permeation prevention characteristic and dusty corrosion resistance, and the service life of the alloy product is longer than the service life of an alloy for a 0Cr15Ni10MnMoWTiAlSc ultra-pure pipe subjected to common passivation treatment by more than 0.5 times under the working environment of same high-purity special gas.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion stainless steel pipes, in particular to an OCr pipe 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 stringent requirements for the purity and impurity content of high-purity gases. , The dew point requirements are getting higher and higher, and the piping technology of high-purity gas is increasingly concerned and valued. In the semiconductor industry and the biopharmaceutical industry, high-purity or ultra-pure clean gases need 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 certain, more attention should be paid Material selection for the piping system. [0003] For special gases, ...

Claims

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Application Information

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Patent Type & Authority Applications(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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