ASTM A209 T1a Boiler Tubes (UNS K11522)
ASTM A209 T1a Boiler Tubes (UNS K11522) are seamless carbon-molybdenum Alloy steel tubes specially developed for high-temperature and high-pressure boiler applications, including superheaters and heat exchangers. The T1a grade offers improved strength, oxidation resistance, and creep resistance compared to standard carbon steel grades, making it suitable for thermal power plants, refinery units, and petrochemical heaters.
Key Features
- Seamless carbon-molybdenum steel design
- Excellent strength at elevated temperatures
- Superior creep resistance
- High dimensional accuracy
- Good oxidation resistance
- Ideal for boilers, superheaters & heat exchangers
- Weldable and machinable grade
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | K11522 |
| ASTM | A209 T1a |
| ASME | SA209 T1a |
| EN (Nearest Equivalent) | 15Mo3 |
| DIN | 15Mo3 |
Available Sizes
- OD: 1/2” to 5”
- WT: 0.065” to 1”
- Length: 4m, 6m, 12m & Customized
Gr T1a Chemical Composition
| Element | T1a Composition (%) |
|---|---|
| Carbon (C) | 0.12 – 0.20 |
| Manganese (Mn) | 0.30 – 0.80 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.10 – 0.50 |
| Molybdenum (Mo) | 0.44 – 0.65 |
Grade T1a Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength | 415 MPa (min) |
| Yield Strength | 255 MPa (min) |
| Elongation | 30% (min) |
| Hardness | 85 HRB (max) |
Gr T1a Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Modulus of Elasticity | 207 GPa |
| Thermal Conductivity | 26 W/m·K |
| Melting Point | 1425 – 1540°C |
| Electrical Resistivity | 0.15 μΩ·m |
Types of ASTM A209 T1a Tubes
- Seamless Boiler Tubes
- Seamless Superheater Tubes
- Heat Exchanger Tubes
- Medium & High-Pressure Boiler Tubes
- Cold Drawn / Hot Finished Tubes
- Annealed & Normalized Tubes
Applications
- High-pressure boilers
- Steam superheaters
- Heat exchangers
- Petrochemical heater tubes
- Refinery boilers
- Power generation units
- Thermal fluid heaters
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