ASTM A213 T22 Seamless Ferritic Alloy Steel Tubes
ASTM A213 T22 (UNS K21590) Seamless Ferritic Alloy Steel Tubes are chromium-molybdenum alloy tubes designed to perform exceptionally under high-temperature and high-pressure environments. With 2.25% chromium and 1% molybdenum, T22 grade provides superior resistance to oxidation, high-temperature strength, and excellent creep resistance.
These tubes are widely used in power plant boilers, superheaters, heat exchangers, refineries, and petrochemical processing units, where thermal stability and long service life are critical.
Key Features
- High Temperature Resistance suitable for boilers, heaters, and superheaters
- Superior Creep Strength at elevated temperatures
- Seamless Construction ensures high pressure handling
- Dimensional Accuracy with cold-drawn or hot-finished manufacturing
- Long Service Life even under cyclic thermal stress
- Ideal for Heat Transfer Applications requiring stable thermal conductivity
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A213 T22 |
| UNS | K21590 |
| EN | 10CrMo910 |
| DIN | 13CrMo44 |
| BS | 622-515 |
| JIS | STBA24 |
Available Sizes
- Outside Diameter (OD): 6 mm – 120 mm
- Wall Thickness (WT): 0.5 mm – 12.5 mm
- Length: 1–12 meters, Custom Cut, Random/Double Random Lengths
- Forms: Straight Tubes, U-Bend Tubes, Coil Tubing
ASTM A213 T22 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.50 – 1.00 |
| Chromium (Cr) | 1.90 – 2.60 |
| Molybdenum (Mo) | 0.87 – 1.13 |
ASTM A213 T22 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 30% |
| Hardness (HBW) | ≤ 163 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Thermal Conductivity @ 20°C | ~33 W/m·K |
| Electrical Resistivity | 0.60 µΩ·m |
| Melting Point | ~1425–1500°C |
| Modulus of Elasticity | 200 GPa |
Types of ASTM A213 T22 Tubes
- Seamless Cold Drawn Tubes
- Hot Finished Alloy Tubes
- U-Bend Tubes
- Boiler Tubes
- Superheater Tubes
- Heat Exchanger Tubes
- High-Pressure Tubing
Applications
- Power Plant Boilers
- Economizers & Superheaters
- Heat Exchangers & Condensers
- Petrochemical & Refinery Heaters
- Steam Boilers
- Thermal & Gas Power Plants
- High-Temperature Processing Equipment
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