ASTM A269 TP316L electropolished stainless steel tubing
May 20, 2026
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What is the ASTM A269 standard?
ASTM A269 is a technical standard developed by the American Society for Testing and Materials (ASTM) for general-purpose seamless and weldable austenitic stainless steel tubing. This standard specifies the material grades, chemical composition, mechanical properties, dimensions, and tolerances for austenitic stainless steel tubing intended for general corrosion resistance and low-temperature service. It applies to steel tubing with an inner diameter ≥ 1/4 inch and a nominal wall thickness ≥ 0.020 inches.
ASTM A269 TP316L electropolished stainless steel tubing is a high-precision tubing designed specifically for high-purity fluid transport, semiconductor gas piping, and biopharmaceutical equipment.
ASTM A269 TP316L Electropolishing tubing features a seamless construction, ensuring a weld-free pipe body, enhancing overall strength and reliability. Electrochemical treatment removes minute surface protrusions and impurities, resulting in an inner wall roughness as low as <0.2 micrometers and an outer wall roughness of <0.4 micrometers. This significantly improves cleanliness, corrosion resistance, and fluid flowability, extending service life by 2.5 times compared to ordinary 316L tubing, with zero leakage ensuring longevity.
ASTM A269 TP316L stainless steel EP tubing is primarily used in fields requiring extremely high surface finish and cleanliness, such as biopharmaceuticals, semiconductor electronics, laboratory equipment, and high-purity gas transport systems.
ASTM A269 TP316L EP Tubing Specifications
| Feature | Specification |
| Material Grade | TP316L (UNS S31603) |
| Manufacturing Standard | ASTM A269 / A632 |
| Surface Finish (ID) | Electropolished (EP) Ra ≤ 0.25μm - 0.4μm |
| Surface Finish (OD) | BA or Polished (180/240/320/400 Grit) |
| Standard Length | 6000mm (Customizable) |
| Certification | EN 10204 3.1, SEM, AES reports available |
If you have any purchasing needs or technical inquiries regarding our TP316L EP tubes, please feel free to request a detailed product catalog and real-time quote.
Chemical Composition of Stainless Steel 316L Tubes
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
| SS 316L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.00 - 18.00 | 2.00 - 3.00 | 10.00 - 14.00 | 68.89 min |
Mechanical Properties of Stainless Steel 316L Tubes
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1399 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
Surface Roughness
| Grade | AP | BA | EP |
| Inside Surface Roughness | Ra ≤ 10 | Ra ≤ 0.8 | Ra ≤ 0.25 |
| Material | 316 Stainless Steel | ||
| Wall Thickness | 0.028 inch-0.083 inch | ||
| Length | 6000mm (optional: 4000mm),(+/- 10% possible) | ||
| Inside Surface Roughness | BA grade: Ra≤0.8 EP grade: Ra≤0.25 |
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| Size | 1/8''-6'' | ||
Applications of ASTM A269 TP316L electropolished tubing
Industries with high requirements for pipe inner wall thickness, especially those requiring a surface roughness below 0.25μm, require 316L EP stainless steel pipes in the following industries:
• Pharmaceutical industry
• Food and beverage industry
• Pure gas or ultrapure gas transportation industry
• High-end automotive industry
• Household and industrial appliances industry
• Semiconductor industry
What is the differences between ASTM A269 and ASTM A270 sanitary tubing?
While both are commonly used in high-cleanliness applications, their focuses differ:
A269 TP316L stainless steel tubing emphasizes general industrial, instrumentation, and corrosion resistance; tolerances are typically set based on OD (outer diameter) and wall thickness.
A270 TP316L stainless steel tubing is specifically designed for sanitary applications (food, pharmaceuticals), with mandatory requirements for surface quality, and tolerances often referencing those for sanitary fittings.
GNEE Stainless Steel produces 316L EP stainless steel pipes of exceptional quality, exceeding average standards and certified by TUV on-site testing. Beyond meeting basic technical parameters, we employ a range of in-house tests to ensure you receive the highest quality "Made in China."
• Roughness testing equipment
• Metallurgical microscope
• Dew point meter
• Hardness tester
• Energy dispersive spectroscopy (EDS)
• Welding testing
• Ultrasonic testing
• Pressure testing (3.0 MPa ~ 4.0 MPa) Free consultation is welcome! We look forward to becoming your long-term partner!
Packaging and Specifications
Size Range: Outer diameter from 1/4" to 6" (6.35mm - 152.4mm), wall thickness 0.89mm, 1.24mm, 1.65mm, 2.11mm, etc.
Length: Standard 4 meters or 6 meters.
Cleaning and Packaging (Critical):
Cleaned in a Class 10 cleanroom.
Ends sealed with dust caps (usually double-layered PE bags).
Purified with high-purity nitrogen (N2 Purged) to prevent oxidation of the inner walls during transport.
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