What is 317L Stainless Steel?
317L stainless steel is a molybdenum-enhanced austenitic stainless steel grade with superior corrosion resistance, particularly against pitting and crevice corrosion in chloride environments. It contains higher molybdenum content compared to standard 316/316L grades, making it ideal for applications involving aggressive chemical environments and acidic conditions. Its excellent corrosion performance makes it suitable for various industrial applications where superior pitting resistance and corrosion resistance are critical.
317L Stainless Steel
Chromium (Cr)
Nickel (Ni)
Molybdenum (Mo)
Carbon (C) Max
Manganese (Mn) Max
Silicon (Si) Max
Phosphorus (P) Max
Sulfur (S) Max
Iron (Fe)
Types of Stainless Steel 317L Pipes & Tubes
As premier manufacturers in the industry, we specialize in producing both stainless steel 317L seamless pipes & tubes and stainless steel 317L welded pipes & tubes, offering comprehensive solutions for diverse corrosive industrial environments and chemical processing requirements.
Manufactured from solid billets through an extrusion process, these pipes deliver superior corrosion resistance and exceptional pressure handling capabilities in aggressive chemical environments. Seamless construction eliminates weld seams, making them the preferred choice for critical chemical processing applications involving acidic media, chloride-containing environments, and aggressive corrosive services where weld integrity is paramount under corrosive conditions.
These pipes provide an economical alternative with availability across a broader spectrum of sizes and dimensions while maintaining excellent corrosion resistance properties. Welded pipes excel in chemical processing equipment, pulp and paper industry applications, and general corrosive service conditions where reliable welded joints are essential. Their cost-effectiveness makes them ideal for corrosive environment projects with budget constraints without compromising pitting resistance and chemical stability.
Specification of Stainless Steel 317L Seamless & Welded Pipes And Tubes
| Specification | Details |
|---|---|
| Stainless Steel Pipe Specification | ASTM A312, A358 / ASME SA312, SA358 |
| SS Tube Specification | ASTM A213, A269, A249, A511, A554 / ASME SA213, SA269, SA249, SA511, SA554 |
| Pipe Size | 1/8” NB to 24” NB, 1/4” OD to 24” OD sizes |
| Tube Size | 1/2″ OD to 8″ OD |
| Thickness Range | 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| Type | Seamless / ERW / Welded / Fabricated Pipes |
| Form | Round, Square, Rectangular, Oval, Hydraulic Etc |
| Length | Single Random, Double Random & Required Length |
| End | Plain End, Beveled End, Threaded |
| End Protection | Plastic Caps |
| Outside Finish | 2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Pipes, Finish as per customer Requirements |
| Delivery Condition | Annealed and Pickled, Polished, Bright Annealed, Cold Drawn |
| Inspection, Test Reports | Mill Test Certificates, EN 10204 3.1, Chemical Reports, Mechanical Reports, PMI Test Reports, Visual Inspection Reports, Third Party Inspection Reports, NABL Approved Lab Reports, Destructive Test Report, Non Destructive Test Reports |
| Packing | Packed in Wooden Boxes, Plastic Bags, Steel Strips Bundled, or as per Customers Requests |
| Specials | Sizes and Specifications other than above can be manufactured on request |
STAINLESS STEEL PIPE & TUBES SCHEDULE DIMENSIONS WALL THICKNESS, WT./MTR. (KG)
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Stainless Steel 317L Pipe Dimensions & Weight Chart
| OD (mm) | WT (mm) | NPS (dn) | Schedule | Weight (kg/m) |
|---|---|---|---|---|
| 13.72 | 1.65 | 1/4″ | 10S | 0.50 |
| 13.72 | 2.24 | 1/4″ | 40S | 0.64 |
| 13.72 | 3.02 | 1/4″ | 80S | 0.81 |
| 17.15 | 1.65 | 3/8″ | 10S | 0.64 |
| 17.15 | 2.31 | 3/8″ | 40S | 0.86 |
| 17.15 | 3.20 | 3/8″ | 80S | 1.12 |
| 21.34 | 2.11 | 1/2″ | 10S | 1.02 |
| 21.34 | 2.77 | 1/2″ | 40S | 1.29 |
| 21.34 | 3.73 | 1/2″ | 80S | 1.65 |
| 26.67 | 2.11 | 3/4″ | 10S | 1.30 |
| 26.67 | 2.87 | 3/4″ | 40S | 1.71 |
| 26.67 | 3.91 | 3/4″ | 80S | 2.23 |
| 33.40 | 2.77 | 1″ | 10S | 2.13 |
| 33.40 | 3.38 | 1″ | 40S | 2.54 |
| 33.40 | 4.55 | 1″ | 80S | 3.29 |
| 48.26 | 2.77 | 1.1/2″ | 10S | 3.16 |
| 48.26 | 3.68 | 1.1/2″ | 40S | 4.11 |
| 48.26 | 5.08 | 1.1/2″ | 80S | 5.49 |
| 60.33 | 2.77 | 2″ | 10S | 3.99 |
| 60.33 | 3.91 | 2″ | 40S | 5.52 |
| 60.33 | 5.54 | 2″ | 80S | 7.60 |
| 88.90 | 3.05 | 3″ | 10S | 6.56 |
| 88.90 | 5.49 | 3″ | 40S | 11.47 |
| 88.90 | 7.62 | 3″ | 80S | 15.51 |
Stainless Steel 317L Tube Size Chart
| Wall Thickness (in) | Available Sizes (in) |
|---|---|
| 0.028″ | 1/16″; 1/8″; 3/16″; 1/4″; 5/16″; 3/8″ |
| 0.035″ | 1/8″; 3/16″; 1/4″; 5/16″; 3/8″; 1/2″; 5/8″; 3/4″; 1″; 1-1/4″; 1-1/2″; 2″ |
| 0.049″ | 1/8″; 3/16″; 1/4″; 5/16″; 3/8″; 1/2″; 5/8″; 3/4″; 1″; 1-1/4″; 1-1/2″; 2″ |
| 0.065″ | 3/16″; 1/4″; 5/16″; 3/8″; 1/2″; 5/8″; 3/4″; 1″; 1-1/4″; 1-1/2″; 2″ |
| 0.083″ | 1/4″; 5/16″; 3/8″; 1/2″; 5/8″; 3/4″; 1″; 1-1/4″; 1-1/2″; 2″; 2-1/2″; 3″ |
| 0.095″ | 1/4″; 3/8″; 1/2″; 5/8″; 3/4″; 1″; 1-1/4″; 1-1/2″; 2″; 2-1/2″; 3″ |
| 0.120″ | 1/2″; 5/8″; 3/4″; 1″; 1-1/4″; 1-1/2″; 2″; 2-1/2″; 3″ |
Pressure Ratings for SS 317L Tubing (PSIG)
| OD (in) | WT 0.028″ | WT 0.035″ | WT 0.049″ | WT 0.065″ | WT 0.083″ | WT 0.095″ | WT 0.109″ | WT 0.120″ |
|---|---|---|---|---|---|---|---|---|
| 1/8″ | 7,900 | 10,100 | N/A | N/A | N/A | N/A | N/A | N/A |
| 1/4″ | 3,700 | 5,800 | 7,900 | 9,500 | N/A | N/A | N/A | N/A |
| 5/16″ | N/A | 3,700 | 5,400 | 7,300 | N/A | N/A | N/A | N/A |
| 3/8″ | N/A | 3,100 | 4,400 | 6,100 | N/A | N/A | N/A | N/A |
| 1/2″ | N/A | 2,300 | 3,200 | 4,400 | N/A | N/A | N/A | N/A |
| 3/4″ | N/A | N/A | 2,100 | 2,900 | 3,900 | 4,500 | N/A | N/A |
| 1″ | N/A | N/A | N/A | 2,200 | 2,900 | 3,400 | 3,900 | 4,300 |
Chemical Composition of Stainless Steel 317L Pipes and Tubes
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 18.00 – 20.00 |
| Nickel (Ni) | 11.00 – 15.00 |
| Molybdenum (Mo) | 3.00 – 4.00 |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
Mechanical Properties of Stainless Steel 317L Pipes and Tubes
| Grade | Tensile Strength (0.2% Offset) min (MPa) | Yield Strength (ksi) min | Elongation (% in 2″) min | Hardness |
|---|---|---|---|---|
| 317L | 515 | 205 | 40 | Rockwell B (95) max Brinell (217) max |
Physical Properties of Stainless Steel 317L Pipes and Tubes
| Grade | Density (kg/m³) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) |
|---|---|---|---|---|---|---|
| 317L | 8000 | 200 | 15.9 (0-100°C) 16.2 (0-315°C) 17.5 (0-538°C) |
14.4 (at 100°C) 16.3 (at 500°C) 19.8 (at 900°C) |
500 | 740 |
Equivalent Grades for Stainless Steel 317L Pipes and Tubes
| STANDARD | WERKSTOFF NR. | UNS | JIS | AFNOR | BS | GOST | EN |
|---|---|---|---|---|---|---|---|
| SS317L | 1.4438 | S31703 | SUS317L | Z3CND19-15-04 | 317S12 | 03Ch18N15M3 | X2CrNiMo18-15-4 |
💡 Practical Difference in Use
Use 317L when: superior corrosion resistance beyond 316L is required, particularly in aggressive chemical environments.
→ Example: chemical processing equipment, pulp and paper digesters, flue gas desulfurization systems.
Use 317L over 316L when: higher molybdenum content (3-4%) is needed for enhanced pitting and crevice corrosion resistance. → Example: sulfuric acid plants, phosphoric acid production, chemical reactors with aggressive media.
Uses of 317L Stainless Steel Pipes
The uses are defined by its enhanced corrosion resistance, particularly in acidic and chloride-containing environments. With higher chromium, nickel, and molybdenum content than 316L, these pipes handle more aggressive process conditions.
- Transporting Highly Corrosive Chemicals: This is its primary function. It’s used for moving concentrated acids, chlorinated compounds, and aggressive process streams where 316L would be inadequate.
- Chemical Process Equipment: 317L pipes are essential in reactors, columns, and heat exchangers handling sulfuric acid, phosphoric acid, and other aggressive chemicals at elevated temperatures.
- Pollution Control Systems: With its superior acid resistance, 317L pipes form critical components in scrubbers, absorbers, and environmental control systems handling corrosive flue gases and effluents.
When to Choose 317L vs. 316L?
This is a critical question. 317L contains higher molybdenum (3-4% vs 2-3% in 316L) and increased chromium/nickel content, providing significantly better resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive environments.
Choose 317L when:
- Higher chloride concentrations exceed 316L’s capabilities (up to 10,000 ppm)
- Applications involve concentrated sulfuric acid, phosphoric acid, or other strong acids
- Process temperatures are elevated and corrosion rates are accelerated
Stick with 316L when:
- Chloride levels are moderate (below 2,000 ppm) and temperatures are ambient
- Cost considerations are paramount (317L is more expensive)
- The corrosive environment is well within 316L’s proven capabilities
Industries That Use 317L Stainless Steel Pipes
317L stainless steel pipes are essential in industries requiring enhanced corrosion resistance beyond standard molybdenum-bearing grades. Here are the primary industries that rely on this superior alloy:
This industry extensively uses 317L for handling concentrated acids and aggressive chemical media.
Uses
Reactor vessels, distillation columns, heat exchangers, and transfer lines for sulfuric acid (concentrated), phosphoric acid, and organic acid processes.
Why 317L?
Superior resistance to concentrated acids and chlorides. Higher molybdenum content provides enhanced protection against pitting and crevice corrosion in aggressive chemical environments.
Critical for digesters and bleaching systems handling aggressive chemical pulping liquors.
Uses
Digester piping, bleach plant equipment, black liquor lines, and chemical recovery systems in kraft and sulfite pulp mills.
Why 317L?
Enhanced resistance to chloride-induced stress corrosion cracking and superior performance in acidic sulfite liquors and chlorine dioxide environments.
Used in processes involving aggressive chemical synthesis and purification.
Uses
Reactor systems, purification columns, and process piping for active pharmaceutical ingredients requiring acid resistance beyond 316L capabilities.
Why 317L?
Superior resistance to organic acids, chlorinated compounds, and aggressive cleaning agents used in pharmaceutical manufacturing.
Essential for flue gas desulfurization and air pollution control equipment.
Uses
Scrubber internals, absorber towers, quench systems, and ducting in flue gas desulfurization (FGD) units and chemical scrubbers.
Why 317L?
Excellent resistance to acidic condensates, chlorides, and sulfur compounds encountered in pollution control applications.
Used in aggressive downhole and processing applications with high chloride content.
Uses
Production tubing, wellhead components, and process piping in sour service applications with elevated H₂S and chloride concentrations.
Why 317L?
Enhanced resistance to chloride stress corrosion cracking and pitting in sour oil and gas environments exceeding 316L capabilities.
Used in applications with highly corrosive food products and cleaning solutions.
Uses
Processing equipment for high-acid foods, vinegar production, pickle lines, and systems using aggressive acid-based cleaning solutions.
Why 317L?
Superior resistance to organic acids (citric, acetic, lactic) and chlorinated cleaning compounds that can corrode standard grades.
Used in critical seawater systems and offshore applications with high chloride exposure.
Uses
Seawater cooling systems, ballast water treatment, and process piping on offshore platforms and vessels in severe marine environments.
Why 317L?
Enhanced resistance to pitting and crevice corrosion in seawater and marine atmospheres, particularly in warm tropical waters.
Essential for handling aggressive leach solutions and processing chemicals.
Uses
Leach tanks, solvent extraction equipment, acid handling systems, and process piping in hydrometallurgical operations.
Why 317L?
Superior performance in acidic leach solutions, chloride-containing process streams, and aggressive chemical environments in mineral processing.
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