ASTM A312 TP316L Austenitic Stainless Steel Pipes (UNS S31603)
ASTM A312 TP316L (UNS S31603) is a low-carbon version of the widely used 316 austenitic stainless steel. The reduced carbon content improves weldability, prevents carbide precipitation, and enhances corrosion resistance—especially in chloride-containing and acidic environments. TP316L stainless steel pipes are ideal for applications requiring long-term durability, cleanliness, and excellent resistance to pitting and crevice corrosion.
Key Features
- Low-carbon (L-grade) for exceptional weldability
- Superior corrosion and pitting resistance due to molybdenum addition
- Ideal for chloride, marine, and chemical environments
- Excellent resistance to intergranular corrosion after welding
- High strength and durability in harsh industrial service
- Excellent oxidation resistance at elevated temperatures
- Hygienic, easy-to-clean surface for food and pharma applications
- Available in seamless, welded, and EFW types
Product Specifications
| Specification | Details |
|---|---|
| Standard | ASTM A312 / ASME SA312 |
| Grade | TP316L |
| UNS Number | UNS S31603 |
| Material | Austenitic Stainless Steel |
| Pipe Type | Seamless / Welded / EFW |
| Forms | Round, Square, Rectangular Pipes |
| Schedule | SCH 5S to SCH XXS |
| Size Range | 1/8” NB to 24” NB |
| End Finish | Plain End (PE), Beveled End (BE), Threaded |
| Surface Finish | Annealed / Pickled / Polished |
| Lengths | SRL, DRL, Custom Cut Lengths |
| Certification | EN 10204 3.1 / 3.2 |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | TP316L |
| UNS | S31603 |
| WNR | 1.4404 / 1.4435 |
| EN | X2CrNiMo17-12-2 |
| JIS | SUS 316L |
| BS | 316S11 |
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: Single Random, Double Random, Custom Lengths up to 12 meters
ASTM A312 TP316L 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 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
ASTM A312 TP316L 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 TP316L 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 | 0.75 µΩ·m |
| Coefficient of Expansion | 16.0 µm/m°C (20–100°C) |
Types of TP316L Stainless Steel Pipes
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- EFW Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- Heat Exchanger Pipes
- Instrumentation & Hydraulic Tubes
- Custom Fabricated Pipes
Applications
- Chemical and petrochemical processing
- Oil & gas pipelines
- Marine and offshore equipment
- Desalination systems
- Food, beverage & dairy processing
- Pharmaceutical and sterile fluid systems
- Heat exchangers & condensers
- Water treatment plants
- Architectural and structural applications
- Fertilizer & pulp and paper industries
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