What are the specifications of S31603EP grade ultra-clean stainless steel pipe?

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 S31603EP grade ultra-clean stainless steel pipe is a high-performance stainless steel pipe designed specifically for the transportation of high-purity fluids. It is widely used in industries with extremely high cleanliness requirements, such as semiconductors, biopharmaceuticals, and food and beverage. Made of S31603 (i.e., 316L), it undergoes electrolytic polishing (EP) treatment, resulting in extremely low surface roughness and excellent corrosion resistance, effectively preventing particle shedding and metal ion precipitation.



The main specifications are as follows:

 1.Materials and Standards

  • Material: S31603 (i.e., 316L), low-carbon austenitic stainless steel
  • Standards: GB/T14976-2012, ASTM A269/A213, DIN/EN/JIS, etc.
  • Corresponding grades: UNS S31603 or EN 1.4404

2.Chemical composition requirements

          Carbon (C): ≤0.03%

          Chromium (Cr): 16.0–18.0%

          Nickel (Ni): 10.0–14.0%

          Molybdenum (Mo): 2.0–3.0%

          Silicon (Si): ≤1.00%

          Manganese (Mn): ≤2.00%


3.Mechanical properties

  • Tensile strength ≥480 MPa
  • Yield strength ≥177 MPa
  • Elongation ≥40%
  • Hardness ≤187 HB or ≤90 HRB (commonly used for export)

4.Size specifications (common range)
  • Outer Diameter (OD): Φ6–Φ219 mm (e.g., Φ11×1, Φ19.05×1.6, Φ63.5×2, Φ219×6, etc.)
  • Wall Thickness (WT): 0.5–8.0 mm, some can reach over 10 mm
  • Length: Standard lengths of 4 meters and 6 meters, or customized as needed (e.g., 1350mm short pipe)
  • Cross-sectional Shape: Mainly round pipes, but custom-shaped pipes are also available.

5.Surface treatment and cleanliness requirements

  •       Surface treatment: Primarily electropolishing (EP)
  •        Surface roughness Ra ≤ 0.25 μm (some high-end applications require Ra < 0.15 μm)
  •        Inner and outer surfaces are mirror-finished, free of weld residue and oxide scale
  •        Clean packaging: Nitrogen-filled and sealed, with PE caps at both ends to prevent contamination during transportation.

6.Application scenario adaptability
  • Biopharmaceuticals: Used for aseptic fluid transport, water purification systems (WFI), and CIP cleaning pipelines.
  • Semiconductors: High-purity specialty gas (e.g., NH₃, HCl) transport pipelines.
  • Food Industry: Aseptic filling lines and dairy processing equipment.
  • Chemical Equipment: Acid and alkali resistant media transport, especially effective
 in chlorine-containing environments.
Manufacturer of S31603EP grade ultra
-clean stainless steel pipes——Maxwell Steel (Jiangsu) Co., Ltd

  • We supply S31603 stainless steel pipes, emphasizing corrosion resistance, suitable for chemical corrosion protection applications.
  • Provides supporting solutions for high-end materials such as Hastelloy and nickel-based alloys.
  • Specifications cover Φ6.0–406 mm, wall thickness 0.3–6.0 mm, meeting various fluid piping needs.
  • We support both customization and bulk supply, and have extensive production experience.
  • Offers EP-grade internal and external polishing with a surface roughness Ra ≤0.25 μm, suitable for biotechnology and food machinery applications.
  • We provide advanced processing services (stamping, bending, laser cutting) and factory parts services with high response efficiency.
  • Our products are widely used in wastewater treatment, industrial welded pipes, and high-purity fluid systems.


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