Product Overview – ASTM A335 T22 Seamless Tubes
ASTM A335 T22 seamless tubes are engineered for heavy-duty thermal applications, making them one of the most preferred alloy steel grades in power generation and petrochemical industries.
With higher chromium and molybdenum content compared to T11 and T12, T22 offers enhanced creep strength, improved oxidation resistance, and long-term thermal stability under extreme operating conditions.
These tubes are manufactured using precision hot rolling and cold drawing processes, ensuring excellent dimensional accuracy and smooth internal surfaces for efficient heat transfer.
Heat treatment processes such as normalizing and tempering refine the grain structure, allowing the tubes to withstand continuous high temperature exposure and pressure fluctuations without failure.
Standard & International Identification - ASTM A335 T22 Seamless Tubes
Technical Specifications – ASTM A335 T22 Tubes
| Tube Type: | Seamless Alloy Steel Boiler Tubes |
| Manufacturing Process: | Hot Rolled → Cold Drawn → Heat Treated → Tested |
| Outer Diameter: | 10 mm to 323 mm |
| Wall Thickness: | 1.5 mm to 50 mm |
| Length Options: | Single Random Length/Cut Length / U-Bend Tubes Available |
| Surface Finish: | Black Finish / Pickled Surface /Bright Annealed |
| Testing & Inspection: | Hydrostatic Test,Ultrasonic Testing,Eddy Current Testing,Hardness Testing |
| Certification : | EN 10204 3.1 / 3.2 MTC |
Third Party Inspection Available
All specifications are in accordance of ASTM A335 / ASME SA335 standards. Mechanical and chemical values are as per standard limits. Mill Test Certificates (MTC) available upon request.
Chemical Composition – ASTM A335 T22
(As per ASTM specification)
| Element | Max (%) |
|---|---|
| Carbon (C): | 0.05 – 0.15% |
| Manganese (Mn): | 0.30 – 0.60% |
| Silicon (Si): | 0.50% |
| Chromium (Cr): | 1.90 – 2.60% |
| Molybdenum (Mo): | 0.87 – 1.13% |
| Phosphorus (P): | Max 0.025% |
| Sulfur (S): | Max 0.025% | Iron : | Balance |
Note: The above chemical composition enhances ASTM A335 T22 tubes with superior resistance to oxidation, scaling, and creep deformation in high-temperature service environments.
Mechanical Properties – ASTM A335 T22 Tubes
| Property | Minimum Value |
|---|---|
| Tensile Strength | 415 MPa |
| Yield Strength | 205 MPa |
| Elongation | 30% |
| Hardness | Max 163 HB |
These mechanical properties enable ASTM A335 T22 seamless tubes to maintain structural integrity under high pressure and temperature, ensuring long-term operational reliability.
High Temperature Performance & Creep Resistance
ASTM A335 T22 tubes are specifically designed for continuous operation in high heat and pressure systems.
What makes T22 a preferred industrial grade:
T22 is often selected for systems where downtime is costly and performance must remain consistent over years.
Industry-Focused Applications of ASTM A335 T22 seamless tubes
- Where T22 tubes are actually used in real projects:
- 🔸Superheater & Reheater Coils in Power Plants
- 🔸High Pressure Boiler Tubing Systems
- 🔸Refinery Furnace & Transfer Lines
- 🔸Petrochemical Heat Exchangers
- 🔸Steam Distribution Pipelines
- 🔸Heavy Engineering & EPC Projects
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