ASTM A213 T24 Seamless Ferritic Alloy Steel Tube
ASTM A213 T24 (UNS K52424) is a high-performance 2.25Cr–1Mo–0.5W ferritic alloy steel tube engineered for high-temperature, high-pressure boiler and superheater systems. This grade provides enhanced creep strength, better oxidation resistance, and improved thermal stability compared to traditional Cr-Mo grades like T22.
T24 is widely used in ultra-supercritical and advanced power plant boilers, refinery furnaces, and heat exchanger systems where long-term durability and resistance to thermal stress are essential.
Key Features
- High Creep & Stress Rupture Strength
- Better Oxidation Resistance than T22 due to added tungsten
- Excellent High-Temperature Performance up to 600–620°C
- Reduced Wall Thickness Requirement due to improved mechanical strength
- Superior Resistance to Thermal Fatigue
- Enhanced Durability for long-life boiler operations
- Seamless Construction ensures stability under pressure cycling
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A213 T24 |
| UNS | K52424 |
| EN / DIN | 7CrMoVTiB10-10 (approx.) |
| ASME | SA213 T24 |
| JIS | STBA24 (nearest comparable grade) |
Available Sizes
- Outside Diameter (OD): 10 mm – 140 mm
- Wall Thickness (WT): 1.0 mm – 15 mm
- Length: 1–12 meters, Custom Cut-to-length
- Forms: Straight Tubes, U-Bent Tubes, Boiler Coils
ASTM A213 T24 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.05 – 0.10 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.010 |
| Silicon (Si) | 0.20 – 0.50 |
| Chromium (Cr) | 2.20 – 2.60 |
| Molybdenum (Mo) | 0.90 – 1.10 |
| Tungsten (W) | 0.30 – 0.60 |
| Vanadium (V) | 0.20 – 0.30 |
| Niobium (Nb) | 0.02 – 0.06 |
| Nitrogen (N) | 0.03 – 0.07 |
ASTM A213 T24 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 590 MPa |
| Yield Strength (0.2% offset) | ≥ 415 MPa |
| Elongation | ≥ 20% |
| Hardness (HBW) | ≤ 250 HB |
| Impact Energy | ≥ 27 J (Room Temperature) |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Thermal Conductivity @ 20°C | ~30 W/m·K |
| Melting Point | 1420–1500°C |
| Electrical Resistivity | 0.75 µΩ·m |
| Modulus of Elasticity | 210 GPa |
| Thermal Expansion Coefficient | ~11.5 µm/m°C |
Types of ASTM A213 T24 Tubes
- Seamless Boiler Tubes
- Superheater Tubes
- Reheater Tubes
- Heat Exchanger Tubes
- U-Bend Tubes
- High-Pressure Furnace Tubes
Applications
- Ultra-Supercritical & Supercritical Power Boilers
- Steam Boilers & Reheater Systems
- High-Temperature Pressure Equipment
- Refinery & Petrochemical Furnaces
- Heat Exchangers & Economizers
- Thermal Power Plant Components
- High-Efficiency Boiler Systems
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