ASTM A213 T23 Seamless Ferritic Alloy Steel Tubes
ASTM A213 T23 (UNS K41650) is a high-strength 2.25Cr–1W ferritic alloy steel tube developed for advanced ultra-supercritical boilers and high-temperature pressure equipment. It is an improved version of T22, offering higher creep strength, superior oxidation resistance, improved weldability, and reduced wall thickness requirements.
T23 tubes are ideal for modern power plants, refinery heaters, and thermal processing units that demand long-term performance at elevated temperatures.
Key Features
- Reduced Wall Thickness Requirement with high strength-to-weight ratio
- Superior Weldability & Fabrication Properties
- Excellent Thermal Stability under cyclic temperature variations
- Lower Cost Alternative to expensive martensitic steels
- Long Service Life in power boilers, reheaters, and superheaters
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A213 T23 |
| UNS | K41650 |
| ASME | SA213 T23 |
| JIS | G3462 STBA23 (Closest Equivalent) |
| EN/DIN | – (No exact equivalent; closest are 7CrMoVTiB10-10 / 7CrWMoVTiB10-10)* |
Available Sizes
- Outside Diameter (OD): 10 mm – 120 mm
- Wall Thickness (WT): 1.0 mm – 15 mm
- Length: 1–12 meters / Custom cut / Random & Double Random Lengths
- Forms: Straight tubes, U-bend tubes, Boiler tubes
ASTM A213 T23 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.010 |
| Silicon (Si) | 0.20 – 0.50 |
| Chromium (Cr) | 1.90 – 2.60 |
| Tungsten (W) | 1.45 – 1.75 |
| Molybdenum (Mo) | ≤ 0.30 |
| Vanadium (V) | 0.20 – 0.30 |
| Niobium (Nb) | 0.02 – 0.06 |
| Boron (B) | 0.001 – 0.006 |
| Nitrogen (N) | 0.03 – 0.07 |
ASTM A213 T23 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 510 MPa |
| Yield Strength (0.2% offset) | ≥ 400 MPa |
| Elongation | ≥ 20% |
| Hardness (HBW) | ≤ 250 HB |
| Impact Strength | ≥ 27 J (at room temperature) |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Thermal Conductivity @ 20°C | ~30 W/m·K |
| Electrical Resistivity | 0.75 µΩ·m |
| Melting Point | ~1420–1470°C |
| Modulus of Elasticity | 210 GPa |
| Coefficient of Thermal Expansion | 11.5 µm/m°C |
Types of ASTM A213 T23 Tubes
- Seamless Boiler Tubes
- Superheater Tubes
- Reheater Tubes
- Heat Exchanger Tubes
- U-Bend Tubes
- High-Pressure Service Tubes
Applications
- Ultra-supercritical & supercritical boilers
- Power plant heat exchangers
- Superheater and reheater tubes
- High-temperature refinery furnaces
- Petrochemical heater tubes
- Steam generation coils
- High-efficiency thermal power systems
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