ASTM A312 TP316Ti Austenitic Stainless Steel Pipes (UNS S31635)
ASTM A312 TP316Ti (UNS S31635) is a titanium-stabilized variant of 316 stainless steel designed to offer improved resistance to intergranular corrosion after welding or exposure at elevated temperatures. The addition of titanium enhances stability, reduces carbide precipitation, and maintains strength in high-temperature and corrosive environments. TP316Ti stainless steel pipes are ideal for chemical processing, marine uses, high-temperature service, and hygienic applications.
Key Features
- Titanium-stabilized austenitic stainless steel
- Excellent resistance to intergranular corrosion
- Superior performance in high-temperature applications
- Enhanced weldability with minimal risk of sensitization
- High resistance to pitting and crevice corrosion
- Durable in chloride-rich and acidic environments
- Good mechanical strength and oxidation resistance
- Available in seamless, welded, and EFW forms
Product Specifications
| Specification | Details |
|---|---|
| Standard | ASTM A312 / ASME SA312 |
| Grade | TP316Ti |
| UNS Number | UNS S31635 |
| Material | Titanium-Stabilized 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 |
| Length | SRL, DRL, Custom Cut Lengths |
| Certification | EN 10204 3.1 / 3.2 |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | TP316Ti |
| UNS | S31635 |
| WNR | 1.4571 |
| EN | X6CrNiMoTi17-12-2 |
| JIS | SUS 316Ti |
| BS | 320S31 |
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 TP316Ti Chemical Composition
| 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 |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Titanium (Ti) | ≥ 5 × C (%) |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
ASTM A312 TP316Ti Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | 40% min |
| Hardness | ≤ 95 HRB |
| Modulus of Elasticity | ~193 GPa |
ASTM A312 TP316Ti 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 TP316Ti Stainless Steel Pipes
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- EFW Stainless Steel Pipes
- Round Pipes
- Square Pipes
- Rectangular Pipes
- Heat Exchanger Tubes
- Industrial Process Pipes
- Custom Fabricated Pipes
Applications
- Chemical and petrochemical processing
- High-temperature processing units
- Marine and offshore equipment
- Pharmaceutical and hygienic piping
- Food and beverage manufacturing systems
- Heat exchangers and condensers
- Oil & gas refinery pipelines
- Fertilizer and pulp & paper industries
- Desalination and water treatment plants
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