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Cleanliness testing technology of stainless steel pipe

The cleanliness of stainless steel pipe refers to the degree of contamination of the steel pipe by impurities. It is expressed by the quality, size and quantity of the impurity particles collected from the specified characteristic parts by a prescribed method. The “prescribed part” refers to the characteristic part that jeopardizes the reliability of the product. “Impurities” include all impurities remaining in the product design, manufacturing, transportation, use and maintenance, which are inherently mixed with the outside world and generated by the system.

With the advancement of science and technology, the field of mechanical manufacturing is moving towards precision development, and the cleanliness of TP304 stainless steel pipes are becoming more and more important in the fields of aviation, aerospace, automobile and electronics. The residual pollutants on the surface of TP304 stainless steel pipes have a huge impact on the key performance of precision products such as precision, reliability and life.

The rinsing liquid in the rinsing process during the cleaning process of the stainless steel tube is used to characterize the cleanliness of the stainless steel tube, and the cleanliness of the rinsing liquid is correlated with the cleanliness of the stainless steel tube, so that the cleaning liquid is passed through the particle size detector during the cleaning process of the stainless steel tube. Instant inspection reveals the real-time cleanliness of the stainless steel tube during the cleaning process. This correspondence is of great importance in the actual production of stainless steel tube cleaning.
The stainless steel tube is cleaned according to ultrasonic cleaning, high-pressure water jet cleaning, and rinsing process. After the cleaning, the rinsing liquid is sampled in the stainless steel tube rinsing unit to check the cleanliness of the rinsing liquid. Limiting the time required for stainless steel tubes to clean high-pressure water jets for cleaning and rinsing, you can get rinses with different cleanliness. More precise inspection of stainless steel pipes corresponding to different cleansing rinses, detecting the cleanliness of the stainless steel pipe surface, and correlating the cleanliness of the rinse liquid with the cleanliness of the stainless steel pipe surface, so that the rinse can be detected immediately during the production process. The cleanliness of the liquid indirectly indicates the cleanliness of the stainless steel tube surface. The correspondence between the cleanliness of the rinse liquid and the cleanliness of the stainless steel tube surface can be obtained by simulation experiments.
The aerospace industry has higher requirements for the reliability of hydraulic systems. In the United States and other Western countries, the research on hydraulic system pollution control was carried out in the aerospace field in the 1960s, and a series of system cleaning and detection technologies were born. The application of these technologies significantly improves the performance of the hydraulic system. China’s hydraulic oil and lubricant manufacturers still control the particle size of oil with less than 0.005% (mass fraction) of “mechanical impurities”, while the United States and many international organizations such as NASA and International Standards Organization (ISO) uses oil particle size and its quantity distribution to measure the cleanliness of the oil, and has developed their own pollution level standards NAS1638 and ISO 4406-1999. The particle contaminants in the liquid are divided into particle sizes, and the degree of contamination of the liquid is defined by the number of particles in each size interval. In the aviation field of China, with the improvement of the cleanliness requirements of TP304 stainless steel pipe, the research on pollution control of aircraft hydraulic system began in the 1970s, and the pollution level standard of particle counting method was also introduced, GJB420-1987, GJB420A. -96 pollution degree standard and the latest GJB420B-06 pollution degree standard, applicable to hydraulic system oil pollution test and fuel, oil and even other working fluids, providing a standard basis for China’s cleanliness field.
Source: China Stainless Steel Pipe Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)

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