ASTM A249 TP304L Stainless Steel Extruded Fin Tube For Air-cooled Exchangers
ASTM A249 TP304L Extruded Fin Tube
I. Product Overview
This is a stainless steel heat transfer tube. The core tube meets ASTM A249 for TP304L, a low-carbon, corrosion-resistant austenitic stainless steel. Its fins are formed by extruding the tube wall itself, creating a seamless, integral one-piece structure. This makes the tube efficient and durable, ideal for demanding heat exchanger applications where reliability is critical. It is commonly used in industries like chemical processing, power generation, and marine engineering for equipment such as boilers, heaters, and coolers. The design ensures robust performance in corrosive environments.
II. Chemical & Mechanical Properties
Base Tube Chemical Composition (%)
| Element | C (max) | Si (max) | Mn (max) | P (max) | S (max) | Cr | Ni |
| Range | 0.030 | 0.75 | 2.00 | 0.045 | 0.030 | 18.00–20.00 | 8.00–12.00 |
Mechanical Properties (Base Tube)
| Tensile Strength (min) | Yield Strength (0.2% offset, min) | Elongation (min) |
| 485 MPa | 170 MPa | 35% |
III. Equivalent Material of TP304L
| ASTM | EN/DIN | UNS | JIS | GB | Common Name |
| A269 TP304L | 1.4306 / X2CrNi18-9 | S30403 | SUS 304L | 022Cr19Ni10 | 304L / Low-carbon 18-8 |
IV. Comparison: TP304L Extruded Fin Tube vs. TP316L & TP321 Alloys
| Property / Grade | TP304L | TP316L | TP321 |
| Material Type | Austenitic stainless steel (low carbon) | Austenitic stainless steel (Mo-added) | Austenitic stainless steel (Ti-stabilized) |
| Key Characteristics | Excellent general corrosion resistance; Good formability & weldability; Low carbon prevents sensitization. | Superior pitting & crevice corrosion resistance due to Mo; Good chloride resistance. | Stabilized with Ti to prevent intergranular corrosion after welding; Good high-temperature strength. |
| Typical Applications | Heat exchangers, condensers, sanitary tubing, food & dairy, moderate corrosion environments. | Coastal, marine, chemical process with chlorides, pharmaceutical, and pulp & paper industries. | High-temperature exhaust systems, aircraft, heat treating equipment, welded assemblies in corrosive service. |
| Chemical Composition (Key) | Cr: 18.00–20.00% Ni: 8.00–12.00% C: ≤0.030% Low carbon for weld integrity |
Cr: 16.00–18.00% Ni: 10.00–14.00% Mo: 2.00–3.00% C: ≤0.030% |
Cr: 17.00–19.00% Ni: 9.00–12.00% Ti: ≥5×C% C: ≤0.08% |
| Mechanical Properties (Min.) | Tensile Strength: ≥485 MPa Yield Strength: ≥170 MPa |
Tensile Strength: ≥485 MPa Yield Strength: ≥170 MPa |
Tensile Strength: ≥515 MPa Yield Strength: ≥205 MPa |
V. Key Applications
● Food, Beverage & Dairy Processing: Pasteurizers, sterilizers, and CIP (clean-in-place) heat exchangers where hygiene, cleanability, and corrosion resistance are critical.
● Chemical & Petrochemical: Shell-and-tube heat exchangers, condensers, and coolers handling organic acids, solvents, and mild corrosive fluids.
● Pharmaceutical & Biotechnology: Process heating/cooling coils, fermenter jackets, and purified water systems requiring non-contaminating, smooth surfaces.
● Marine & Offshore: Freshwater generators, lube oil coolers, and seawater-cooled heat exchangers with treated or low-chloride water.
● HVAC & Refrigeration: Chiller tubes, condenser coils, and heat recovery units in corrosion-prone or clean-air applications.
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