ASME SA312 TP347H Stainless Steel Seamleess Pipe With SS Fin Strip For Heater
ASME SA312 TP347H Stainless Steel Seamleess Pipe with SS Fin Strip for Heater
Product Overview
ASME SA312 TP347H Stainless Steel Fin Tube is manufactured by applying stainless steel fin strips onto a seamless TP347H pipe, typically using high-frequency welding (HFW) or embedded finning techniques. It’s ideal for high-temperature heater applications requiring superior creep strength, oxidation resistance, and structural stability under thermal stress.
Chemical Composition
Base Tube: ASME SA312 TP347H
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.04–0.10 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 17.0–19.0 |
| Nickel (Ni) | 9.0–13.0 |
| Columbium (Nb) | 10×C to 1.10 (stabilizer) |
Fin Strip: Stainless Steel (typically SS304 or SS347)
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 18.0–20.0 |
| Nickel (Ni) | 8.0–12.0 |
| Carbon (C) | ≤ 0.08 (304) or ≤ 0.10 (347H) |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
Mechanical Properties
SA312 TP347H Base Tube
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness (HB) | ≤ 217 HB |
| Operating Temperature | Up to 1000°C |
Fin Strip (Stainless Steel)
| Property | Value |
|---|---|
| Tensile Strength | 500–750 MPa |
| Oxidation Resistance | Excellent >800°C |
| Corrosion Resistance | Excellent |
Advantages
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Superior High-Temperature Strength: TP347H performs well under creep conditions in high heat zones.
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Excellent Weldability: Seamless tube and fin strip have stable austenitic structure ideal for HFW or TIG welding.
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Resistance to Oxidation & Carburization: Both base and fins resist scale formation at elevated temperatures.
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Stable Grain Structure: Niobium stabilizer in TP347H prevents intergranular corrosion and ensures long service life.
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Low Thermal Stress Fatigue: Suitable for cyclic operations in furnaces and fired heaters.
Typical Applications
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Petrochemical Heaters
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Fired Heaters in Refineries
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Steam Superheaters
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Radiant and Convection Tubes
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Furnace Coils and Heat Recovery Units
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High-Pressure Boilers and Reheat Coils
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