317L Stainless Steel Pipe Tube in 6m Length SS317L Alloy Seamless Pipe UNS S31703 Tubing

Chemical Composition (Key Parameters)

• Carbon (C): ≤ 0.03% (low carbon content enhances weldability and resistance to intergranular corrosion)
• Chromium (Cr): 18.00 - 20.00% (primary element for oxidation and corrosion resistance)
• Nickel (Ni): 11.00 - 15.00% (stabilizes the austenitic structure, improving ductility and toughness)
• Molybdenum (Mo): 3.00 - 4.00% (greatly enhances resistance to pitting and crevice corrosion, especially in chloride environments)
• Manganese (Mn): ≤ 2.00%
• Silicon (Si): ≤ 1.00%
• Phosphorus (P): ≤ 0.045%
• Sulfur (S): ≤ 0.030%

Mechanical Properties

• Tensile strength: ≥ 485 MPa
• Yield strength (0.2% offset): ≥ 170 MPa
• Elongation: ≥ 40% (high ductility for forming and fabrication)
• Hardness (Brinell): ≤ 217 HB

Standards

• ASTM A312: Standard specification for seamless and welded austenitic stainless steel pipes.
• ASTM A269: Specification for seamless and welded austenitic stainless steel tubing for general service.
• ASME SA312 / SA269: Similar to ASTM standards, adopted for pressure vessel and boiler applications.
• EN 10216-5: European standard for seamless stainless steel tubes for pressure purposes.

Specifications (6m Length Focus)

• Outer Diameter (OD): Typically from 6mm to 630mm (custom sizes available upon request).
• Wall Thickness (WT): From 0.8mm to 20mm (schedule 5S, 10S, 40S, 80S, etc., per ASTM standards).
• Length: Standard 6m (20 feet), with options for cut-to-length or longer lengths (e.g., 12m) based on requirements.
• Surface Finish: Annealed and pickled (AP), polished (BA/EP), or sandblasted, depending on application needs (e.g., hygiene-critical industries prefer polished surfaces).

Equivalent Grades

• UNS S31703 (USA)
• EN 1.4438 (European Union)
• JIS SUS317L (Japan)
• GB 00Cr19Ni13Mo3 (China, obsolete; current equivalent may vary)

Key Characteristics

1. Superior Corrosion Resistance: The high molybdenum content (3-4%) makes 317L more resistant to pitting, crevice corrosion, and stress corrosion cracking than 304 or 316 stainless steel, especially in chloride-rich environments (e.g., seawater, chemical processing).
2. Low Carbon Content: The "L" in 317L indicates low carbon, which minimizes carbide precipitation during welding, reducing the risk of intergranular corrosion.
3. High-Temperature Performance: Maintains strength and oxidation resistance at elevated temperatures (up to 800°C), suitable for high-heat applications.
4. Excellent Ductility and Weldability: Easily formed, bent, or welded using standard methods (e.g., TIG, MIG welding) without significant loss of properties.
5. Hygienic and Non-Magnetic: Austenitic structure ensures non-magnetic behavior, and smooth surface finishes make it suitable for food, pharmaceutical, and sanitary applications.

Applications

• Chemical Processing: For transporting corrosive chemicals, acids (e.g., sulfuric acid), and solvents.
• Oil and Gas: In offshore platforms, subsea pipelines, and refineries, where resistance to saltwater and sour gases (H₂S) is critical.
• Pharmaceutical and Food Processing: Hygienic tubing for sterile fluid transfer, as it is easy to clean and resistant to bacterial growth.
• Desalination Plants: For handling brine and seawater during the desalination process.
• Power Generation: In boilers, heat exchangers, and flue gas desulfurization systems, where high temperatures and corrosion resistance are required.
• Marine Engineering: For shipbuilding components, such as seawater cooling systems and exhaust pipes.