ASTM A213 T9 Alloy Steel Seamless Studded Fin Tube For HVAC Systems
1. What is ASTM A213 T9 Studded Fin Tube?
ASTM A213 T9 Studded Fin Tube is a high-temperature heat transfer component engineered for extreme thermal and corrosive service. It consists of a seamless chromium-molybdenum alloy steel base tube (ASTM A213 T9) with stud-type fins resistance-welded perpendicularly to the surface. This robust construction maximizes heat flux in high-ash/flue gas environments (up to 600°C/1,112°F), offering superior oxidation resistance and 3x longer life than carbon steel tubes in waste heat boilers, reformers, and fired heaters.
2. Chemical & Mechanical Properties
Chemical Composition (ASTM A213 T9 Base Tube)
|
Element |
Content (%) |
Critical Function |
|
Chromium (Cr) |
8.0–10.0 |
Oxidation resistance |
|
Molybdenum (Mo) |
0.90–1.10 |
High-temp strength |
|
Carbon (C) |
0.15 max |
Weldability |
|
Manganese (Mn) |
0.30–0.60 |
Toughness |
|
Silicon (Si) |
0.25–1.00 |
Deoxidation |
|
Phosphorus (P) |
≤ 0.025 |
Purity |
|
Sulfur (S) |
≤ 0.025 |
Ductility |
Mechanical Properties (System)
|
Property |
Base Tube (T9) |
|
Tensile Strength |
≥ 415 MPa |
|
Yield Strength |
≥ 205 MPa |
|
Max Service Temp. |
600°C (1,112°F) |
|
Hardness |
≤ 179 HB |
|
Thermal Conductivity |
36.7 W/m·K |
3. Key Applications & Competitive Advantages
· Refinery Heaters: Convection sections in CDU/VDU heaters (resists sulfidation).
· Chemical Reformers: Syngas coolers in methanol/ammonia plants.
· Waste Heat Recovery: Boilers in cement/steel mills (handles >80g/Nm³ fly ash).
· Power Generation: SCR system heat exchangers for coal-fired plants.
· Petrochemical: Cracking furnace convection tubes.
4. Why This Solution Dominates:
· 10-Year Lifespan: Withstands 650°C cyclic operation per NACE RP0492.
· Ash Erosion Resistance: Stud spacing blocks ash buildup – 40% lower fouling vs. helical fins.
· Cost Saving: 35% lower OPEX than refractory-lined carbon steel tubes.
· Customization: Stud height (15–40mm), diameter (3–8mm), and pitch optimization.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.