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.
Product Introduction
Electrochemical polishing stainless steel tube is a high-quality stainless steel pipe material. This pipe is made of high-quality stainless steel and has good corrosion resistance and strength. The surface of the EP pipe is electrolytically polished, giving it excellent corrosion resistance, high inner surface smoothness, and cleanliness, enabling it to maintain good performance even in harsh environments such as high temperatures and high pressures.
Application
Commonly used in semiconductors, LCD panels, biomedicine, aerospace, scientific research experiments, and high-end manufacturing.
Product Material
304, 304L, 316, 316L Hastelloy, nickel-based alloys, and other special stainless steel materials.
Standards
GB、EN、ASTM、GOST、DIN、JIS , etc .
Grades
304/304L（ASTM A312 TP304）、316/316L（ASTM A312 TP316）、321（ASTM A312 TP321）、310S（ASTM A312 TP310S）、UNS S32205、904L超級奧氏體（UNS N08904）、254SMO（UNS S31254）
Certification Standards
ASTM A269（Seamless Pipe）、ASTM A270（Sanitary Pipe）、EN 10217-7（EN standard pressure pipe）
