ASTM A312 TP316H Austenitic Stainless Steel Pipe
ASTM A312 TP316H (UNS S31609) is a high-carbon, high-temperature variant of the popular 316 stainless steel family. It offers superior creep strength, stress-rupture resistance, and elevated-temperature mechanical stability, making it ideal for high-pressure and high-heat industrial environments.
The presence of higher carbon content combined with Mo-enhanced corrosion resistance ensures excellent performance in aggressive and elevated-temperature service such as boilers, heat exchangers, refinery heaters, superheaters, and petrochemical processing systems.
Key Features
- UNS S31609 high-carbon grade for high-temperature service
- Enhanced strength at elevated temperatures (high creep resistance)
- Excellent resistance to pitting, crevice corrosion & chlorides
- Superior resistance to acids, alkalis, and high-pressure steam
- Smooth surface finish ensuring superior flow efficiency
- Excellent weldability & fabricability
- Available in seamless, welded, ERW & EFW forms
- Suitable for severe corrosive & heat-intensive applications
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S31609 |
| WNR | 1.4401 (Approx. for 316 Series) |
| EN | X5CrNiMo17-12-2 (Close equivalent) |
| JIS | SUS 316H |
| BS / EU | 316H Stainless Steel |
Available Sizes
Outside Diameter (OD):
-
6 mm – 610 mm
Wall Thickness (WT):
-
0.5 mm – 50 mm
Pipe Lengths:
- SRL (Single Random Length)
- DRL (Double Random Length)
- Custom Cut-to-Length
ASTM A312 TP316H Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Chromium (Cr) | 16.0 – 18.0 |
| Nickel (Ni) | 10.0 – 14.0 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
ASTM A312 TP316H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Proof) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HBW |
ASTM A312 TP316H Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1375–1400°C |
| Thermal Conductivity | 14.6 W/m·K (at 100°C) |
| Electrical Resistivity | 0.74 µΩ·m |
| Modulus of Elasticity | 193 GPa |
| Specific Heat | 500 J/kg·K |
Available Types
- Seamless Stainless Steel Pipes
- Welded Stainless Steel Pipes
- ERW Pipes
- EFW Pipes
- Annealed & Pickled Pipes
- Polished Pipes (180–600 Grit)
- Custom Fabricated Pipes
Applications
- Boilers & Superheaters
- Heat Exchangers & Condensers
- Refinery Process Heaters
- Petrochemical & Chemical Processing Units
- Power Plants & Steam Boilers
- High-Pressure Steam Lines
- Fertilizer Plants & Digesters
- Food & Pharmaceutical Processing (high-temperature areas)
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