Electropolished Stainless Steel Tubes (EP Polished Tubes) are high-precision tubular materials processed using an electropolishing process, achieving a surface finish of Ra ≤ 0.2 μm. This process forms a dense passivation layer, significantly enhancing corrosion resistance and cleanliness. The product is manufactured using austenitic stainless steels (such as 304/L, 316/L, 321) and duplex steels (2205), super austenitic steel (904L), and fully complies with the requirements of the ASTM A269/A312 standard.
The EP polishing process eliminates surface micro-defects through anodic dissolution, achieving a mirror-like finish (#8K grade) on the inner wall of the tube, while generating a chromium-rich oxide layer that improves corrosion resistance by 5-10 times compared to traditional mechanical polishing. Its core advantages include: absolutely no metal ion leaching from the surface (certified by ASTM A967 passivation testing), extremely low inner wall roughness (reducing pressure drop by 30%), and compliance with the SEMI F19 ultra-high-purity gas transportation standard and ASME BPE-2019 bioprocess equipment specifications.
This type of tubing is particularly suitable for semiconductor ultra-high-purity gas piping systems with stringent cleanliness requirements (ISO Class 3), biopharmaceutical sterile systems (3-A Sanitary standard), and food and beverage processing equipment (EHEDG certified). It ensures zero contamination of the fluid medium while offering excellent mechanical strength and weldability.