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| Brand Name: | YUHONG |
| MOQ: | 200-500KGS |
| Price: | Negotiable |
| Payment Terms: | L/C,T/T,AT SIGHT |
| Supply Ability: | According to Clients' requirements |
| Attribute | Value |
|---|---|
| Product Name | HFW Serreted Finned Tube |
| Bare Tube Specification & Material | ASTM A312 TP347 |
| Fin Height | 10~50mm |
| Fin Thick | 0.3~3mm |
| Highlight | ASTM A312 Finned Tube, Serrated Spiral Finned Tube, Heat Exchanger Finned Tube |
| Application | Power Plants, Chemical Plants, Oil Refineries |
ASTM A312 TP347 Serrated Spiral High-Frequency Welding (HFW) Finned Tube is an advanced heat transfer solution for extreme oxidation and creep resistance. It combines a seamless stabilized austenitic stainless steel base tube (ASTM A312 TP347) with helically wound serrated spiral fins bonded via high-frequency resistance welding. The serrated fin edges disrupt boundary layers, enhancing heat transfer by 35% vs. smooth fins, while the Nb-stabilized alloy resists intergranular corrosion up to 870°C (1,598°F). Ideal for high-ash flue gases and cyclic thermal shock services.
| Element | TP347 Base (%) | Critical Function |
|---|---|---|
| Chromium (Cr) | 17.0-20.0 | Oxidation shield |
| Nickel (Ni) | 9.0-13.0 | Austenite stability |
| Niobium (Nb) | 10×C min* | Intergranular corrosion resistance |
| Carbon (C) | ≤ 0.08 | Weldability |
| Manganese (Mn) | ≤ 2.00 | Strength |
| Silicon (Si) | ≤ 1.00 | Deoxidation |
| Phosphorus (P) | ≤ 0.045 | Purity |
| Sulfur (S) | ≤ 0.030 | Machinability |
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Max Service Temp. | 870°C (1,598°F) |
| Hardness | ≤ 192 HB |
| Fin Bond Shear Strength | > 140 MPa |
| Oxidation Resistance | ≤ 0.1 g/m²*h (980°C/air) |
