ASTM A213 T9 Alloy Steel Seamless Tube ASME SA213 Grade T9 U Bend Heat Exchanger Tube
ASTM A213 T9 Seamless Alloy Steel U Bend Heat Exchanger Tube for High-temperature Services
The “T9” grade offers high‑temperature oxidation resistance, creep strength, and resistance to hydrogen attack. U‑bend configuration accommodates thermal expansion without requiring expansion joints. After cold bending, the tube must receive post‑bend heat treatment (stress relief or annealing) to restore mechanical properties and eliminate residual stresses.
Equivalent Grades of ASTM A213 T9 Alloy Steel Seamless Tube U Bend Heat Exchanger Tube
| Grade | UNS | Steel Number | Trade Name |
| T9 | S50400 | 1.7386 | 9Cr-1Mo |
Chemical Composition of ASTM A213 T9 Alloy Steel Seamless Tube U Bend Heat Exchanger Tube
|
Grade |
C |
Mn |
P |
S |
Si |
Mo |
|---|---|---|---|---|---|---|
| T9 | 0.15 max | 0.30~0.60 | 0.025 | 0.025 | 0.25-1.0 | 0.90~1.10 |
Mechanical Properties of ASTM A213 T9 Alloy Steel Seamless Tube U Bend Heat Exchanger Tube
| Grade | Tensile Strength, MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
| T9 | 415 min | 205 min | 30 min | 179 max |
Key Characteristics of Grade T9
-
Oxidation Resistance: Excellent scaling resistance up to approximately 650°C (1200°F) .
-
Creep Strength: High creep rupture strength due to the Molybdenum addition.
-
Hydrogen Attack: Suitable for high-temperature hydrogen service in refineries (often used in the hydrogen reformer section and heat exchangers).
-
Fabricability: While it has good ductility, T9 is a hardenable steel. Cold bending (U-bending) requires careful attention to the bending radius and subsequent heat treatment.
Application
- Petrochemical Refineries: Hydrogen reformer units, hydrocrackers, and catalytic reformers.
- Fired Heaters: Where resistance to high-temperature sulfur corrosion is required.
- Power Generation: Superheaters and reheaters in high-pressure boilers.
- Shell and Tube Heat Exchangers: Specifically in environments where the tube side fluid is at high temperatures or contains corrosive agents.
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