ASTM A312 TP317L Austenitic Stainless Steel Pipes (UNS S31703)
ASTM A312 TP317L (UNS S31703) is a low-carbon variant of 317 stainless steel, designed for superior resistance to pitting, crevice corrosion, and chemical attack. The reduced carbon content improves weldability and prevents carbide precipitation, making it ideal for corrosive environments requiring strong, clean welds. TP317L pipes are widely used in chloride-rich, acidic, and high-temperature industrial applications demanding enhanced durability.
Key Features
- Low-carbon (L grade) for excellent weldability
- Enhanced resistance to pitting and crevice corrosion
- Superior performance in chemical, acidic, and chloride environments
- Excellent stress-corrosion cracking resistance
- High durability and oxidation resistance at elevated temperatures
- Improved resistance versus TP316L and TP317
- Hygienic, easy-to-clean surface for food and pharma industries
- Available in seamless, welded, and EFW types
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | TP317L |
| UNS | S31703 |
| WNR | 1.4438 |
| EN | X2CrNiMo18-15-4 |
| JIS | SUS 317L |
| BS | 317S11 |
Available Sizes
- Outer Diameter (OD): 6 mm to 610 mm
- Wall Thickness: 1.2 mm to 60 mm
- Nominal Bore: 1/8” NB to 24” NB
- Lengths: SRL, DRL, Custom up to 12 meters
ASTM A312 TP317L Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 11.0 – 15.0 |
| Molybdenum (Mo) | 3.0 – 4.0 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
ASTM A312 TP317L Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 485 MPa |
| Yield Strength (0.2% Proof) | ≥ 170 MPa |
| Elongation | 40% min |
| Hardness | ≤ 95 HRB |
| Modulus of Elasticity | ~193 GPa |
ASTM A312 TP317L Physical Properties
| Property | Value |
|---|---|
| Density | 8.00 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | 16.3 W/m·K (at 100°C) |
| Electrical Resistivity | 0.74 µΩ·m |
| Coefficient of Expansion | 16.0 µm/m°C (20–100°C) |
Types of TP317L Stainless Steel Pipes
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- EFW Stainless Steel Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- Chemical Processing Pipes
- Heat Exchanger & Condenser Tubes
- Custom Fabricated Pipes
Applications
- Chemical & petrochemical processing
- Marine & offshore systems
- Pharmaceutical & hygienic equipment
- Paper & pulp industry
- Acidic and chloride-rich environments
- Heat exchangers & evaporators
- Food & beverage processing
- Oil & gas industry
- Desalination & water treatment plants
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