ASTM A312 TP316LN Austenitic Stainless Steel Pipes (UNS S31653)
ASTM A312 TP316LN (UNS S31653) is a nitrogen-enhanced, low-carbon version of 316 stainless steel. The combination of nitrogen addition and low carbon content improves high-strength performance, weldability, and resistance to intergranular corrosion. TP316LN offers exceptional durability in chloride-containing, marine, chemical, and high-pressure industrial environments.
Key Features
- Low carbon (L grade) improves weldability
- Nitrogen addition enhances strength and toughness
- Superior pitting and crevice corrosion resistance
- Excellent performance in chloride-rich and marine environments
- High-pressure and high-temperature capability
- Improved mechanical strength over TP316L and TP316
- Resistant to intergranular corrosion after welding
- Available in seamless, welded, and EFW types
| Standard |
Grade |
| ASTM |
TP316LN |
| UNS |
S31653 |
| WNR |
1.4406 |
| EN |
X2CrNiMoN17-11-2 |
| JIS |
SUS 316LN |
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
- Length: SRL, DRL, Custom up to 12 meters
ASTM A312 TP316LN Chemical Composition
| Element |
Percentage (%) |
| Carbon (C) |
0.03 max |
| Manganese (Mn) |
2.00 max |
| Silicon (Si) |
1.00 max |
| Chromium (Cr) |
16.0 – 18.0 |
| Nickel (Ni) |
10.0 – 14.0 |
| Molybdenum (Mo) |
2.00 – 3.00 |
| Nitrogen (N) |
0.12 – 0.22 |
| Phosphorus (P) |
0.045 max |
| Sulfur (S) |
0.030 max |
| Iron (Fe) |
Balance |
ASTM A312 TP316LN 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 TP316LN 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 |
0.73 µΩ·m |
| Coefficient of Expansion |
16.0 µm/m°C (20–100°C) |
Types of TP316LN Stainless Steel Pipes
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- EFW Stainless Steel Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- High-Pressure Application Pipes
- Heat Exchanger & Condenser Pipes
- Custom Fabricated Pipes
Applications
- High-pressure chemical and petrochemical systems
- Marine and offshore structures
- Oil and gas piping systems
- Pharmaceutical and food processing plants
- Cryogenic and low-temperature applications
- Heat exchangers, condensers, boilers
- Water treatment and desalination plants
- Pulp & paper industry
- Power generation and nuclear applications
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