Stainless Steel 317L Seamless Pipes & Tubes
SS 317L (UNS S31703) contains 3-4% molybdenum, providing significantly better pitting and crevice corrosion resistance than 316L. The low carbon content ensures weldability without sensitization. It bridges the gap between standard austenitic grades and expensive nickel alloys.
Size Range
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness
SCH 5S to SCH 80S
Standards
4 specs
Chemical Composition (% by weight)
| C | Mn | Si | Cr | Ni | Mo | P | S |
|---|---|---|---|---|---|---|---|
| 0.030 max | 2.00 max | 0.75 max | 18.0-20.0 | 11.0-15.0 | 3.0-4.0 | 0.045 max | 0.030 max |
Mechanical Properties (Minimum at Room Temperature)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| 515 MPa min | 205 MPa min | 35% min | 95 HRB max |
Physical Properties - SS 317L
| Density | Melting Range | Thermal Conductivity | Electrical Resistivity | Specific Heat | Coeff. of Thermal Expansion |
|---|---|---|---|---|---|
| 7.98 g/cm3 | 1375-1400 C | 14.4 W/m-K | 790 nOhm-m | 500 J/kg-K | 16.5 um/m-C |
Corrosion Resistance - SS 317L
| Property | Value |
|---|---|
| Pitting Resistance (PREN) | ~29 |
| Max Service Temp (Oxidizing) | 870 C |
| Intergranular Corrosion | Resistant (low carbon) |
| Stress Corrosion Cracking | Superior to 316L in chlorides |
| General Corrosion Rate | <0.02 mm/yr in sulfuric acid |
| Seawater Resistance | Good - superior to 316L |
Equivalent International Grades
| ASTM | JIS | BS |
|---|---|---|
| TP317L | SUS 317L | 317S12 |
SS 317L vs Comparable Grades
| Grade | UNS | Tensile | Yield | PREN | Max Temp |
|---|---|---|---|---|---|
| SS 316 / 316LAustenitic Stainless Steel | S31600 | 515 / 485 MPa min | 205 / 170 MPa min | ~24 | 870 C |
| SS 904LAustenitic Stainless Steel | N08904 | 490 MPa min | 220 MPa min | ~36 | 450 C |
| Duplex 2205Duplex Stainless Steel | S32205 | 655 MPa min | 450 MPa min | ~35 | 315 C (to avoid 475C embrittlement) |
Applicable Standards
Applications
Key Advantages of SS 317L
SS 317L Applications by Region
Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait)
Used in gas processing plants, FGD systems, and chemical facilities in Saudi Arabia, UAE, and Qatar.
Europe (Germany, UK, Norway, Netherlands, Italy)
Specified for FGD systems, pulp mills, and chemical plants in Germany, Scandinavia, and UK.
United States
Standard for FGD systems, pulp & paper, and chemical processing applications.
Frequently Asked Questions about SS 317L Seamless Pipes
Quick Specifications
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
SCH 5S to SCH 80S
Industries Served
Related Grades
Related Content
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