ASME SA335 P9 Alloy Steel HFW Solid Finned Tube With Carbon Fin For Heat Exchangers
1.What is ASME SA335 P9 Alloy Steel HFW Solid Finned Tube with Carbon Fin?
ASME SA335 P9 HFW Solid Finned Tube with Carbon Fin is a high-temperature solution engineered for sulfur-rich environments. It combines a seamless chromium-molybdenum alloy steel base tube (ASME SA335 P9) with helically wound solid carbon steel fins bonded via high-frequency welding (HFW). This robust design delivers exceptional resistance to sulfidation and oxidation up to 600°C (1,112°F), making it ideal for refinery heaters, coker units, and high-sulfur flue gas applications.
2.Chemical & Mechanical Properties
Dimensional Specifications:
|
Base Tube O.D:15.88–325 mm |
|||
|
Fin Height:: 6–50.8 mm |
Fin Thickness: 0.8–3.0 mm |
Fin Pitch: As Customer’s Request |
Tube Ends: Plain Ends / Beveled Ends |
|
No Fin Area (Both Ends): As Customer’s Request And Drawing |
|||
Chemical Composition (%)
|
SA335 P9 Base Tube Chemical Composition (%) |
||||||||
|
Element |
C |
Mn |
P |
S |
Si |
Cr |
Mo |
Others |
|
Range |
≤0.15 |
0.30~0.60 |
≤0.025 |
≤0.025 |
0.50~1.00 |
8.00~10.00 |
0.90~1.10 |
Balance (Fe) |
Mechanical Properties
|
Property |
SA335 P9 Base Tube |
Carbon Steel Fin |
|
Tensile Strength |
≥ 415 MPa |
≥ 400 MPa |
|
Yield Strength |
≥ 205 MPa |
≥ 250 MPa |
|
Elongation |
≥ 30% |
≥ 23% |
|
Hardness |
≤ 179 HB |
≤ 150 HB |
|
Max Service Temp. |
600°C (1,112°F) |
400°C (752°F) |
|
Sulfidation Resistance |
★★★★★ (Per NACE RP0472) |
★★☆ |
3.Key Applications
· Refinery Heaters: Convection sections in crude/vacuum distillation units.
· Delayed Cokers: Transfer line exchangers handling 500°C+ vapors.
· Coal-Fired Plants: Economizers for high-sulfur flue gas (SO₂ > 3,000 ppm).
· Chemical Processing: Sulfuric acid regeneration heaters.
· Petrochemical: Hydrogen reformer effluent boilers.
4.Why Choose ASME SA335 P9 Alloy Steel HFW Solid Finned Tube :
A:Company Competitiveness:
Yuhong Holding Group has more than 35 years experience for steel pipe and tube , fin tube , main application for Petrochemical , Oil refinary, Furnace, heating, boiler, heat exchanger, air cooler,.., till now YUHONG brand products already exported more than 85 countries, which like UK, ITALY, SPAIN , USA, MEXICO , COLOMBIA , BRAZIL, SAUDI ARANBIA , OMAN, QATAR, U.A.E, KOREA, ...., YUHONG brand already won good reputation in the market.
B:Product Competitiveness:
· 5X Sulfidation Life: Outperforms carbon steel tubes per API RP939-C.
· Zero Fin Detachment: HFW ensures >120 MPa bond strength (AWS D17.1).
· Cost Efficiency: Carbon steel fins reduce cost by 40% vs. alloy fins.
· Rapid Delivery: 30% stock coverage for standard sizes (OD 19–102mm).
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.