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ASTM A312 TP317L Stainless Steel Seamless Pipe with High Molybdenum for Superior Corrosion Resistance
| MOQ: | 5Ton |
| Price: | Based on grade, size, surface, processing, quantity and current raw material market price. |
| Standard Packaging: | Standard seaworthy export packing with bundles, waterproof wrapping, pallets or wooden cases. |
| Delivery Period: | 7-15 |
| Payment Method: | L/C,D/A,D/P,T/T,Western Union |
| Supply Capacity: | Stock supply, regular production and custom manufacturing available. |
Shaanxi Shangyou Stainless Steel Co., Ltd. supplies ASTM A312 TP317L stainless steel seamless pipe for global distributors, EPC contractors, fabricators and project procurement teams. Manufactured to ASTM A312/A312M and ASME SA312 standards, TP317L seamless pipe delivers exceptional corrosion resistance in severe environments through elevated chromium, nickel and molybdenum content.
TP317L (UNS S31703, EN 1.4438) is an austenitic stainless steel with higher alloy content than 316L. The 18-20% chromium, 11-15% nickel and 3-4% molybdenum provide significantly enhanced resistance to pitting and crevice corrosion in chloride environments. The low carbon content (0.035% max) minimizes sensitization during welding, making it suitable for as-welded applications requiring corrosion integrity. This alloy offers higher creep, stress-to-rupture, and tensile strength at elevated temperatures than conventional stainless steels.
| Parameter | Available Specification |
|---|---|
| Product Standard | ASTM A312/A312M, ASME SA312 |
| UNS Designation | S31703 |
| EN/WNR | 1.4438 |
| Dimensional Standard | ASME B36.19 |
| OD Range | 1/4" NPS to 24" NPS (6mm to 600mm+) |
| Wall Thickness | Schedules 5S to XXS |
| Length | Standard 6m or Customized |
| End Types | Plain End, Beveled End |
| Surface Finish | Annealed & Pickled, Bright Annealed |
| Inspection Tests | Hydrostatic, Eddy Current, Tension, Flattening |
| Documents | MTC 3.1, Inspection Reports, Packing List |
| Parameter | TP317L Specification |
|---|---|
| Carbon (C) | ≤ 0.035% |
| Chromium (Cr) | 18.0 – 20.0% |
| Nickel (Ni) | 11.0 – 15.0% |
| Molybdenum (Mo) | 3.00 – 4.00% |
| Manganese (Mn) | ≤ 2.00% |
| Silicon (Si) | ≤ 1.00% |
| Tensile Strength (min) | 515 MPa |
| Yield Strength (min) | 205 MPa |
| Elongation (min) | 35% |
ASTM A312 TP317L seamless pipe is specified for severe corrosive service where 316L is inadequate.
Typical applications include:
- Flue Gas Desulphurization (FGD) systems – ductwork, absorber towers, stack liners
- Chemical and petrochemical processing – pressure vessels, heat exchangers, tanks
- Pulp and paper handling equipment
- Food processing equipment
- Condensers in power generation stations
- Textile equipment handling aggressive dyestuffs
When selecting TP317L seamless pipe, buyers should consider:
Corrosion Environment: TP317L provides considerably higher resistance to sulfuric acid than 316L. It resists sulfuric acid concentrations up to 5% at 120°F (49°C) and higher concentrations below 100°F (38°C). In sulfur-bearing gas condensation environments, 317L offers much greater resistance at the condensation point than 316L. Strong oxidizing acids such as nitric acid may still cause attack.
Welding and Sensitization: Low carbon content enables use in the as-welded condition without sensitization or intergranular corrosion. This matches the weldability advantage of 316L while offering superior corrosion resistance.
Selection Checklist:
- Is 316L insufficient for the chloride or acid environment? Choose 317L
- Will the component be welded? Low carbon of 317L provides as-welded corrosion resistance
- For even more severe environments, consider 317LMN with higher Mo (4-5%) and N
ASTM A312 TP317L seamless pipes are packed with export-standard protection including plastic wrapping, edge protection, steel strapping and wooden cases or steel frames. Packaging can be adjusted according to pipe size, weight and shipping requirements.
Quality documents may include MTC 3.1, inspection reports, packing lists and other agreed certificates. PMI/OES (XRF) can identify Cr, Ni, Mo, but cannot independently confirm L/H carbon level differences—refer to MTC for complete verification.
For quality evaluation, customers should provide heat number, package identification, inspection records and product photos. Technical solutions will be provided according to specifications and contract requirements.
1. What is ASTM A312 TP317L?
ASTM A312 TP317L is a low-carbon (≤0.035%), molybdenum-bearing (3-4%) austenitic stainless steel seamless pipe with elevated Cr and Ni content for superior corrosion resistance.
2. What is the difference between 317L and 316L?
317L has higher chromium (18-20% vs 16-18%), nickel (11-15% vs 10-14%) and molybdenum (3-4% vs 2-3%), providing significantly better pitting and crevice corrosion resistance in chloride and acidic environments.
3. What is UNS S31703?
UNS S31703 is the Unified Numbering System designation for TP317L stainless steel, equivalent to EN 1.4438.
4. What is the PREN of 317L?
With 3-4% Mo and 18-20% Cr, PREN is approximately 30-33, notably higher than 316L (24-26).
5. Can 317L be welded?
Yes. Low carbon content provides resistance to sensitization, allowing use in the as-welded condition without intergranular corrosion.
6. What are typical applications for 317L?
Flue gas desulphurization systems, chemical processing, pulp and paper, food processing, and power generation condensers.
7. What are the mechanical properties of TP317L?
Minimum tensile strength 515 MPa, yield strength 205 MPa, elongation 35%.
8. What documents are provided with delivery?
Typical documents include MTC 3.1, inspection reports, packing list, and heat number traceability.
Need ASTM A312 TP317L Stainless Steel Seamless Pipe for chemical processing, FGD systems or severe corrosive environments?
Send your requirements including OD/wall thickness, schedule, length, application conditions and quantity. Shangyou Stainless Steel provides customized processing, third-party inspection and export solutions for global B2B customers.
