Stainless Steel 317L Seamless Pipes & Tubes Manufacturer & Supplier
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.
UNS: S31703 | Category: Austenitic Stainless Steel | Werkstoff Nr: 1.4438 | EN Name: X2CrNiMo18-15-4
SS 317L — Also Known As
SS 317L is also commonly known as SS 317L, 317L SS, Stainless Steel 317L Seamless Pipes & Tubes, S31703, UNS S31703, 1.4438, Werkstoff 1.4438, W.Nr 1.4438, X2CrNiMo18-15-4, 317l, aisi 317l.
SS 317L — Applicable Standards & Specifications
SS 317L is commonly supplied to ASTM A312, ASME SA312, ASTM A213, ASME SA213, ASME SA269, ASTM A249, ASME SA249, EN 10216-5.
Size Range
Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness: SCH 5S to SCH 80S
Chemical Composition (%)
| 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
- Tensile Strength
- 515 MPa min
- Yield Strength
- 205 MPa min
- Elongation
- 35% min
- Hardness
- 95 HRB max
Physical Properties
- Density
- 7.98 g/cm3
- Melting Range
- 1375-1400 C
- Thermal Conductivity
- 14.4 W/m-K
- Electrical Resistivity
- 790 nOhm-m
- Specific Heat
- 500 J/kg-K
- Coeff. of Thermal Expansion
- 16.5 um/m-C
Corrosion Resistance
- 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
Applicable Standards
- ASTM A312 / ASME SA312
- ASTM A213 / ASME SA213
- ASTM A269
- DIN EN 10216-5
Applications
- Flue gas desulfurization systems
- Pulp & paper bleach plants
- Phosphoric acid production
- Sulfuric acid processing
- Chemical reactor vessels
- Organic acid handling
Industries Served
- Chemical Processing
- Pulp & Paper
- Fertilizer
- FGD Systems
- Pharmaceutical
Key Advantages
- Superior pitting resistance vs 316L (PREN ~29 vs ~24)
- Excellent resistance to sulfuric and phosphoric acids
- Low carbon prevents sensitization during welding
- Cost-effective alternative to nickel alloys in many environments
- Outstanding resistance in FGD environments
Equivalent Grades
- ASTM
- TP317L
- JIS
- SUS 317L
- BS
- 317S12