Pickling of stainless steel pipe refers to a surface treatment process that removes scale, welding slag, and other impurities on the surface of the pipe by immersing the stainless steel pipe in an acidic solution. The purpose of pickling stainless steel pipe is mainly to improve the surface quality of stainless steel pipe, improve its corrosion resistance and aesthetics, and also provide a better foundation for subsequent processing and application.


First, the main purpose of pickling of stainless steel pipe
1. Removal of scale and welding slag: Stainless steel pipes will form scale and welding slag during production and processing, and these substances will reduce the surface quality and corrosion resistance of the pipe. Pickling can effectively remove these impurities and make the surface of stainless steel pipe cleaner and smoother.
2. Improve corrosion resistance: Through pickling treatment, the chromium oxide film on the surface of stainless steel pipe can be repaired and enhanced, thereby improving the corrosion resistance of stainless steel pipe and extending its service life.
3. Improve appearance quality: The surface of stainless steel pipes treated with pickling is brighter and more uniform, the color is more consistent, and the appearance is more beautiful. It is suitable for fields with high requirements for appearance, such as architectural decoration, furniture manufacturing, etc.


Second, the process flow of stainless steel pipe pickling
The process flow of stainless steel pipe pickling usually includes the following steps:
1. Pretreatment: First, clean the surface of the stainless steel pipe to remove impurities such as oil, dust, etc. to ensure the pickling effect.
2. Pickling treatment: Soak the cleaned stainless steel pipe in a special acid solution. Commonly used pickling solutions include nitric acid, hydrofluoric acid, etc. These acid solutions can effectively dissolve oxide scale and welding slag.
3. Neutralization treatment: Neutralize the pickled stainless steel pipe to neutralize the acidic substances remaining on the surface of the pipe to prevent damage to the environment and the pipe itself.
4. Cleaning and drying: Clean and dry the neutralized stainless steel pipe to ensure that the surface of the pipe is clean and dry.
Third, precautions for pickling of stainless steel pipes
1. Safety first: The pickling solution is corrosive to a certain extent. Operators should do a good job of protection, and wear protective glasses, gloves, etc. to avoid acid splashing on the skin and eyes.
2. Control the pickling time and temperature: Too long pickling time or too high temperature may cause damage to the stainless steel pipe. The pickling parameters should be reasonably controlled according to the specific situation.
3. Reasonable treatment of acid waste liquid: The waste liquid generated during the pickling process is hazardous waste and should be reasonably treated in accordance with relevant laws and regulations to avoid pollution to the environment.


As an important part of the production process of stainless steel pipes, pickling of stainless steel pipes improves the quality and performance of stainless steel pipes by removing surface oxides and impurities, making them more suitable for applications in various industrial and living fields. In actual operation, we need to strictly follow the standard operating procedures and do a good job of safety protection and environmental protection to ensure the pickling effect and production safety.