ASTM A312 TP317L Welded Stainless Steel Round Pipe
Material Grade;TP317L (UNS S31703)
Manufacturing Process;TIG Welded, Laser Welded, ERW
Outside Diameter ;1/8"–24" (10.3–610 mm)
Wall Thickness;SCH 5S, SCH 10S, SCH 20, SCH 40S, SCH 80S, SCH 160, XXS
Length;5.8 m, 6 m, 12 m, or Customized
Surface Finish;Pickled, Bright Annealed (BA), Polished, No.4, Mirror
End Type;Plain End (PE), Beveled End (BE), Threaded End
Weld Type;Longitudinal Welded
Available Certificates;EN 10204 3.1 MTC, ISO 9001, SGS, BV, TUV
Packing;Plastic Caps, Waterproof Wrapping, Wooden Cases, Steel Strips, Export Seaworthy Packing
If you are seeking a welded stainless steel pipe that excels in resisting chloride pitting, crevice corrosion, and highly corrosive chemical media, ASTM A312 TP317L welded stainless steel round pipe is an ideal choice for demanding industrial sectors such as chemical processing, marine engineering, pulp and paper, flue-gas desulfurization (FGD), and pharmaceuticals.
ASTM A312 Stainless Steel 317L Pipes Suppliers
GNEE supplies ASTM A312 TP317L pipes with outer diameters ranging from 21.3 mm to 630 mm and wall thicknesses from 1.5 mm to 20 mm, covering specifications from SCH 5S to SCH 160. We also offer customization services-including cut-to-length, end beveling, polishing, and machining-to meet specific project requirements. Our 317L stainless steel pipes are manufactured using advanced automatic TIG welding processes and undergo full solution annealing, pickling, and passivation to ensure uniform corrosion resistance across the weld zone.
Our ASTM TP317L welded stainless steel pipes are made from low-carbon, high-molybdenum austenitic stainless steel. The composition features strictly controlled carbon content (≤0.03%), chromium (18.0%–20.0%), nickel (11.0%–15.0%), and molybdenum (3.0%–4.0%). This formulation minimizes carbide precipitation during welding and provides a critical pitting temperature 15–20°C higher than that of 316L in chloride-containing environments. With a tensile strength of 515 MPa, a minimum yield strength of 205 MPa, and a minimum elongation of 35%, these pipes are widely used in moderately to highly corrosive applications, including paper bleaching, flue-gas desulfurization, chemical heat exchange, seawater desalination, and high-salinity wastewater treatment.
ASTM A312 TP317L Welded Pipe Specification
| Item | Specification |
|---|---|
| Product Name | ASTM A312 TP317L Welded Stainless Steel Round Pipe |
| Standard | ASTM A312 / ASTM A312M |
| Material Grade | TP317L (UNS S31703) |
| Pipe Type | Welded Stainless Steel Round Pipe |
| Manufacturing Process | TIG Welded, Laser Welded, ERW, Solution Annealed, Pickled & Passivated |
| Outside Diameter (OD) | 1/8"–24" (10.3–610 mm) |
| Wall Thickness | SCH 5S, SCH 10S, SCH 20, SCH 40S, SCH 80S, SCH 160, XXS |
| Length | 5.8 m, 6 m, 12 m, or Customized |
| Surface Finish | Pickled, Bright Annealed (BA), Polished, No.4, Mirror |
| End Type | Plain End (PE), Beveled End (BE), Threaded End |
| Weld Type | Longitudinal Welded |
| Heat Treatment | Solution Annealed |
| Testing | Hydrostatic Test, Eddy Current Test, PMI, Flattening Test, Flaring Test, Intergranular Corrosion Test, 100% Visual Inspection |
TP317L Welded Stainless Steel Pipe chemical composition
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) |
| Value (%) | ≤ 0.030 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 1.00 | 18.0 – 20.0 | 11.0 – 15.0 | 3.0 – 4.0 |
Mechanical Properties (At Room Temperature)
TP317L maintains excellent ductility and strength.
| Property | Metric Value | Imperial Value |
| Tensile Strength (min) | 515 MPa | 75 ksi |
| Yield Strength 0.2% Offset (min) | 205 MPa | 30 ksi |
| Elongation (in 50mm, min) | 35% | 35% |
| Hardness (Brinell) max | 192 HBW | 192 HBW |
| Hardness (Rockwell B) max | 90 HRB | 90 HRB |
What is the difference between 317 and 317L stainless steel?
The main difference between 317 and 317L stainless steel is carbon content. Grade 317 has a maximum carbon content of 0.08%, whereas grade 317L (the "L" stands for "low carbon") limits carbon to a maximum of 0.03%.
What filler metal should be used for field welding TP317L pipes?
It is recommended to use ER317L welding wire or E317L electrodes to match the base metal. In some highly aggressive environments, "over-alloyed" fillers like Alloy 625 (Inconel) are used to ensure the weld is even more corrosion-resistant than the pipe.
Are there any temperature limitations for TP317L?
While it has excellent oxidation resistance up to 870°C (1600°F), its primary use is for aqueous corrosion resistance at lower temperatures. Prolonged exposure in the 425°C – 815°C range can lead to "sigma phase" formation, which can cause brittleness, though the "L" grade is more resistant to this than standard 317.
Applications of ASTM A312 TP317L Stainless Steel ERW Pipe
Chemical and petrochemical industries: Process systems handling highly corrosive acids and chloride solutions.
Pulp and paper mills: Bleaching equipment and the handling of acidic, chloride-containing liquids.
Oil and gas industry: Refinery piping and acidic gas environments containing H₂S and Cl⁻.
For further assistance, please specify: What are the required dimensions or wall thickness ratings (Schedule) for your project? What chemical or temperature environment will the piping be exposed to?
Quality Control
Eddy Current Testing (ET): Standard for detecting surface and sub-surface defects in the weld.
Radiographic Testing (RT/X-ray): Often requested for critical applications to ensure 100% penetration and no internal porosity.
Hydrostatic Test: Every pipe is pressurized with water to ensure there are no leaks.
Flattening/Flaring Test: Mechanical tests to ensure the weld doesn't crack when the pipe is deformed.
High-quality packaging
A. Bundled Packing: Suitable for large quantities and thick-walled pipes.
Method: Pipes are arranged in bundles and strapped with steel bands.
Outer Wrapping: After bundling, the entire unit is typically covered with double-layer woven bags or polyethylene plastic film.
B. Wooden Case / Plywood Case Packing: Wooden materials must comply with the ISPM 15 standard (bearing the fumigation mark).
C. Steel Frame / Crate Packing: Suitable for large-diameter pipes.
For large-diameter 317L welded pipes, steel frames are often used for securing to facilitate container loading and reduce weight; however, all contact surfaces must be cushioned with rubber or wooden blocks.
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