ASTM A312 TP316N Austenitic Stainless Steel Pipes (UNS S31651)
ASTM A312 TP316N (UNS S31651) is a nitrogen-enhanced austenitic stainless steel pipe grade derived from 316. The controlled nitrogen addition significantly improves yield strength, tensile strength, and pitting resistance, making TP316N ideal for high-pressure and corrosive environments. It delivers superior mechanical performance while maintaining the excellent corrosion resistance characteristics of conventional 316 stainless steel.
Key Features
- Nitrogen-enhanced grade for improved mechanical strength
- Superior resistance to pitting, crevice corrosion, and chloride attack
- Higher tensile and yield strength compared to standard 316
- Excellent toughness at both high and low temperatures
- Improved stress-corrosion cracking resistance
- Good weldability and formability
- Suitable for high-pressure and corrosive industrial service
- Available in seamless, welded, and EFW types
Product Specifications
| Specification | Details |
|---|---|
| Standard | ASTM A312 / ASME SA312 |
| Grade | TP316N |
| UNS Number | UNS S31651 |
| Material | Nitrogen-Strengthened Austenitic Stainless Steel |
| Pipe Type | Seamless / Welded / EFW |
| Forms | Round, Square, Rectangular Pipes |
| Schedule | SCH 5S – SCH XXS |
| Size Range | 1/8” NB to 24” NB |
| End Finish | Plain End, Beveled End, Threaded |
| Surface Finish | Annealed / Pickled / Polished |
| Lengths | SRL, DRL, Custom Cut Lengths |
| Certification | EN 10204 3.1 / 3.2 |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | TP316N |
| UNS | S31651 |
| WNR | 1.4429 (Approximate) |
| EN | X2CrNiN18-10Mo2 (Nearest Equivalent) |
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 TP316N Chemical Composition (TP316N / UNS S31651)
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.08 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) | 0.10 – 0.20 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Iron (Fe) | Balance |
ASTM A312 TP316N Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 550 MPa |
| Yield Strength (0.2% Proof) | ≥ 240 MPa |
| Elongation | 40% min |
| Hardness | ≤ 95 HRB |
| Modulus of Elasticity | ~193 GPa |
ASTM A312 TP316N 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 | 0.73 µΩ·m |
| Coefficient of Expansion | 16.0 µm/m°C (20–100°C) |
Types of TP316N Stainless Steel Pipes
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- EFW Stainless Steel Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- High-Pressure Hydraulic Pipes
- Heat Exchanger & Condenser Pipes
- Custom Fabricated Pipes
Applications
- High-pressure piping systems
- Chemical and petrochemical plants
- Marine and offshore platforms
- Oil and gas processing lines
- Heat exchangers and condensers
- Food, dairy, and pharmaceutical equipment
- Water treatment & desalination systems
- Fertilizer, pulp, and paper industries
- Structural and architectural applications
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