ASTM A213 T36 Seamless Alloy Steel Tubes
ASTM A213 T36 Seamless Ferritic Alloy Steel Tubes (UNS K40326) are designed for high-temperature, high-pressure boiler and superheater applications. Manufactured with a chromium-molybdenum-silicon alloy, T36 delivers outstanding oxidation resistance, creep strength, thermal stability, and carburization resistance, making it ideal for power plants, petrochemical heaters, and steam generation systems.
Key Features
- High-temperature resistance up to 650°C
- Superior oxidation & carburization resistance
- Exceptional creep & stress-rupture strength
- Manufactured seamless for high-pressure stability
- Excellent thermal fatigue resistance
- Suitable for boilers, superheaters, reheaters, and heat exchangers
- Long service life in extreme environments
Equivalent Grades
| Standard | Equivalent |
|---|---|
| ASTM | A213 T36 |
| ASME | SA213 T36 |
| UNS | K40326 |
| EN / DIN | – No exact equivalent |
| JIS | – No exact equivalent |
Available Sizes
- Outside Diameter (OD): 10 mm – 140 mm
- Wall Thickness (WT): 1.0 mm – 15 mm
- Length: 1–12 meters, Custom Cut, Random / Double Random
- Forms: Straight Tubes, U-bend Tubes, Coil Tubes
ASTM A213 T36 Chemical Composition
| Element | % Content |
|---|---|
| Carbon (C) | 0.02 – 0.08 |
| Manganese (Mn) | 0.30 – 0.70 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.010 |
| Silicon (Si) | 1.50 – 2.50 |
| Chromium (Cr) | 8.00 – 10.00 |
| Molybdenum (Mo) | 0.90 – 1.10 |
| Nickel (Ni) | ≤ 0.40 |
| Copper (Cu) | ≤ 0.40 |
| Nitrogen (N) | ≤ 0.030 |
ASTM A213 T36 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 485 MPa |
| Yield Strength | ≥ 275 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 190 HB |
| Impact Energy | ≥ 27 J (RT) |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Thermal Conductivity (20°C) | ~22 W/m·K |
| Melting Point | 1400–1450°C |
| Electrical Resistivity | 0.80 µΩ·m |
| Modulus of Elasticity | 210 GPa |
| Thermal Expansion | ~11.0 µm/m°C |
Types of ASTM A213 T36 Tubes
- Seamless Boiler Tubes
- Superheater Tubes
- Reheater Tubes
- Heat Exchanger Tubes
- U-Bend Tubes
- High-Pressure Furnace Tubes
Applications
- Power Plant Boilers (Superheater & Reheater Sections)
- Petrochemical Heater Tubes
- High-Pressure Heat Exchangers
- Steam Generation Coils
- Refinery Furnace Systems
- Thermal Power Equipment
- High-Temperature Process Tubing
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