ASTM A312 TP304 Studded Fin Tube with 13Cr (SS410) Pins For Fired Heaters & Boilers
ASTM A312 TP304 Studded Fin Tube with 13Cr (SS410) Pins For Fired Heaters & Boilers
It is a high-efficiency heat exchanger tube with a TP304 stainless steel base pipe and 13Cr (SS410) stainless steel stud pins welded onto the outer surface. It is a specialized industrial component designed to maximize heat transfer efficiency in demanding, high-temperature environments. It combines a corrosion-resistant base tube with metal pins (studs) welded onto its surface to increase the area available for heat exchange.
The fundamental purpose of this product is to solve a common engineering challenge: how to transfer more heat within a limited space. By welding 13Cr (SS410) pins onto the TP304 tube, the outer surface area is dramatically increased. This allows for much more efficient thermal exchange between the fluid inside the tube and the hot gases or fluids on the outside.
The combination of materials is strategic:
- The TP304 base tube provides a reliable, corrosion-resistant conduit for the internal fluid, resisting oxidation and chemical attack.
- The 13Cr (SS410) pins offer the mechanical strength and heat resistance needed to survive constant exposure to high-temperature furnace environments, such as in petrochemical heaters or boiler systems.
1. Base Tube: ASTM A312 TP304 (UNS S30400)
Chemical Composition (wt %, max unless range)
| Element | Composition |
| Carbon (C) | ≤ 0.08% |
| Manganese (Mn) | ≤ 2.00% |
| Phosphorus (P) | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% |
| Silicon (Si) | ≤ 1.00% |
| Chromium (Cr) | 18.00 – 20.00% |
| Nickel (Ni) | 8.00 – 11.00% |
| Molybdenum (Mo) | — |
Mechanical Properties (minimum values, annealed condition)
| Property | Value |
| Tensile Strength | 515 MPa (75 ksi) |
| Yield Strength (0.2% offset) | 205 MPa (30 ksi) |
| Elongation in 2 in. | ≥ 35% |
2. Fins: 13Cr (SS410) Pins
- 13Cr / SS410 (UNS S41000 / 1.4006): A martensitic stainless steel with ~13% chromium, low nickel, and magnetic properties.
- Key advantages for pins:
- higher thermal conductivity
- better high-temperature strength
- good resistance to oxidation/steam corrosion compared to TP304
3. Key advantages of this kind of combination
- High Thermal Efficiency: Studs provide ~5–10x more external surface area than a bare tube.
- Good Fouling Resistance: Pin geometry is less prone to dust/soot buildup compared to plate fins.
- Mechanical Durability: SS410 pins withstand vibration and thermal cycling better than thinner fins.
- Cost-Effective: More affordable than fully high-alloy finned tubes while meeting performance needs.
4.Typical Applications
This tube is widely used in gas-to-liquid heat exchangers where the gas side is hot and mildly corrosive:
- Fired Heaters & Boilers: Economizers, air preheaters, waste heat recovery units.
- Process Industries: Oil refineries, petrochemical plants, power generation.
- HVAC & Industrial Furnaces: Heat recovery from exhaust gases.
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