ASTM A213 TP316H Stainless Steel Seamless Tube (UNS S31609)
ASTM A213 TP316H (UNS S31609) Stainless Steel Tubes are an austenitic stainless steel grade specially designed for high-temperature and high-pressure applications. The “H” grade contains a higher carbon content compared to TP316 and TP316L, which significantly enhances its creep strength, mechanical durability, and structural stability at elevated temperatures. This makes TP316H the ideal choice for boiler tubes, superheater tubes, heat exchangers, and other components exposed to continuous high-temperature service.
With excellent corrosion resistance, especially in acidic, chloride-rich, and oxidizing environments, TP316H offers dependable performance in petrochemical plants, refineries, fertilizer plants, and power generation units. The material exhibits excellent resistance to pitting and crevice corrosion due to its molybdenum content, while maintaining outstanding tensile strength and oxidation resistance. This grade is widely used where temperatures exceed 500°C and long-term strength reliability is crucial.
Key Features
- Higher carbon content for improved high-temperature strength
- Excellent creep resistance and thermal stability
- Superior corrosion resistance in chloride and acidic environments
- Ideal for continuous high-temperature service
- Enhanced pitting & crevice corrosion resistance
- Excellent weldability and formability
- Long service life with reduced maintenance requirements
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | S31609 |
| WNR | 1.4919 |
| EN | X5CrNiMo17-12-2H |
| JIS | SUS 316H |
| BS | 316H |
Available Sizes
- Outer Diameter: 6 mm to 101.6 mm
- Wall Thickness: 0.5 mm to 12.7 mm
- Length: Up to 12 meters
- Customized boiler & superheater tubing available on request
ASTM A213 TP316H Chemical Composition
| Element | % |
|---|---|
| C | 0.04 – 0.10 |
| Mn | 2.00 max |
| Si | 1.00 max |
| P | 0.045 max |
| S | 0.030 max |
| Cr | 16.0–18.0 |
| Ni | 10.0–14.0 |
| Mo | 2.00–3.00 |
| N | 0.10 max |
| Fe | Balance |
ASTM A213 TP316H Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 515 MPa min |
| Yield Strength | 205 MPa min |
| Elongation | 35% min |
| Hardness | 90 HRB max |
| Creep Strength | Superior due to high carbon content |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1375–1400°C |
| Thermal Conductivity | 16.3 W/m·K |
| Modulus of Elasticity | 193 GPa |
Types
- TP316H Seamless Boiler Tubes
- TP316H Superheater Tubes
- TP316H Heat Exchanger Tubes
- TP316H High-Temperature Tubing
- TP316H Instrumentation Tubes
Application
- Power Plants & High-Temperature Boilers
- Petrochemical & Refinery Units
- Fertilizer Plants
- Heat Exchangers & Superheaters
- Chemical & Processing Equipment
- Marine & Offshore Components
- High-Temperature Piping Systems
- Oil & Gas Industries
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