ASTM A209 T1B Boiler Tubes (UNS K11522)
ASTM A209 T1B Boiler Tubes (UNS K11522) are seamless carbon-molybdenum alloy steel tubes designed for high-temperature and high-pressure boiler applications. As an enhanced version of T1, the T1B grade offers tighter chemical control and improved mechanical strength, making it ideal for superheaters, heaters, and heat exchangers operating in extreme thermal environments. These tubes exhibit excellent creep strength, oxidation resistance, and long-term service reliability.
Key Features
- Enhanced high-temperature strength compared to T1
- Superior creep resistance
- Excellent resistance to thermal fatigue
- High dimensional accuracy
- Good weldability (after proper heat treatment)
- Suitable for high-pressure boiler components
- Manufactured as seamless for superior structural integrity
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | K11522 |
| ASTM | A209 T1B |
| ASME | SA209 T1B |
| EN | 15Mo3 (Nearest alternative, not exact equivalent) |
Available Sizes
- Outside Diameter: 12.7 mm to 127 mm
- Wall Thickness: 1.5 mm to 25 mm
- Lengths: 4–12 meters, custom cut-to-length available
ASTM A209 T1B Chemical Composition
| Element | T1B Composition (%) |
|---|---|
| Carbon (C) | 0.14 – 0.22 |
| 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 |
Gr T1B Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 440 MPa (min) |
| Yield Strength | 270 MPa (min) |
| Elongation | 30% (min) |
| Hardness | 89 HRB (max) |
Gr T1B 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 T1B Tubes
- Seamless Boiler Tubes
- Superheater Tubes
- High-Pressure Heater Tubes
- Heat Exchanger Tubes
- Normalized & Stress-Relieved Tubes
- Thick/Heavy Wall Boiler Tubes
Applications
- High-pressure boilers
- Superheaters & reheaters
- Petrochemical heaters
- Heat exchangers
- Power generation boilers
- Refinery heating units
- Process industry steam lines
- Thermal & industrial boilers
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