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What are the differences in the production processes of BA grade and EP grade stainless steel pipes
The production processes of BA grade stainless steel tubes and EP grade stainless steel tubes differ as follows:
Surface treatment method:
BA grade stainless steel tubes: They undergo bright annealing treatment. In a high-temperature environment, inert gases such as argon are used as the atmosphere inside the furnace to prevent material oxidation. Then, they are rapidly cooled to form a uniform, smooth, and oxide-free shiny surface.
EP grade stainless steel tubes: On the basis of BA grade stainless steel tubes, an electrolytic polishing process is added. The stainless steel tubes are immersed in an electrolyte solution, and through the electrolytic action, the small protrusions on the surface of the material are dissolved first, thereby flattening the surface and achieving a smoother mirror-like effect.
Cleaning process:
BA grade stainless steel tubes: Usually, ultrasonic cleaning is used, and cleaning agents such as SC2286 are used for degreasing and oil removal to remove surface oil and impurities.
EP grade stainless steel tubes: In addition to the similar cleaning steps as BA grade tubes, high-purity water purification treatment is also required to meet higher cleanliness requirements.
Precision control:
BA grade stainless steel tubes: The dimensional accuracy can reach ±0.05mm, and the internal surface roughness Ra can be lower than 0.4 micrometers.
EP grade stainless steel tubes: The precision requirements are higher. The diameter tolerance is controlled within ±0.02mm (0.1%), the length tolerance is controlled within ±0.05mm, the straightness bending degree is no more than 0.1mm/m, the surface roughness Ra of the finished product is ≤0.15μm, and the concentricity tolerance is controlled within ±0.01mm.
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