ASTM A312 TP317LN Austenitic Stainless Steel Pipes (UNS S31726)
ASTM A312 TP317LN (UNS S31726) is a nitrogen-enhanced, low-carbon variant of 317 stainless steel designed for superior strength, enhanced corrosion resistance, and excellent weldability. The added nitrogen increases yield and tensile strength, while the low carbon content improves resistance to intergranular corrosion after welding. TP317LN stainless steel pipes are ideal for aggressive chemical environments, chloride exposure, and high-pressure applications.
Key Features
- Nitrogen-enhanced for superior mechanical strength
- Low-carbon (L grade) for improved weldability
- Excellent resistance to pitting, crevice, and chloride corrosion
- Enhanced toughness at high and low temperatures
- Superior stress corrosion cracking resistance
- Performs better than TP316, TP316L, TP317, and TP317L in harsh conditions
- Suitable for high-pressure and corrosive environments
- Available in seamless, welded, and EFW types
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | TP317LN |
| UNS | S31726 |
| WNR | 1.4439 (Approximate) |
| EN | X2CrNiMoN18-15-4 (Nearest Equivalent) |
| JIS | SUS 317LN |
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 TP317LN 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 |
| Nitrogen (N) | 0.12 – 0.25 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Iron (Fe) | Balance |
ASTM A312 TP317LN Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 530 MPa |
| Yield Strength (0.2% Proof) | ≥ 240 MPa |
| Elongation | 35% min |
| Hardness | ≤ 95 HRB |
| Modulus of Elasticity | ~193 GPa |
ASTM A312 TP317LN Physical Properties
| Property | Value |
|---|---|
| Density | 8.00 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | 16.3 W/m·K (100°C) |
| Electrical Resistivity | 0.74 µΩ·m |
| Coefficient of Expansion | 16.0 µm/m°C (20–100°C) |
Types of TP317LN Stainless Steel Pipes
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- EFW Stainless Steel Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- High-Pressure Industrial Pipes
- Heat Exchanger & Condenser Tubes
- Custom Fabricated Pipes
Applications
- High-pressure chemical processing
- Petrochemical & refinery pipelines
- Marine & offshore structures
- Acidic and chloride-rich environments
- Desalination and water treatment plants
- Paper & pulp industry
- Food & pharmaceutical processing
- Heat exchangers & evaporators
- Oil & gas industry
- Power generation & nuclear environments
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