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| Brand Name: | Yuhong |
| Model Number: | ASTM A249 TP304L |
| MOQ: | 200~500 KGS |
| Price: | Negotiable |
| Payment Terms: | TT, LC |
| Supply Ability: | According to Clients' requirements |
ASTM A249 TP304L L Type Finned Tube With AL1060 Fins For Waste Heat Recovery Units
ASTM A249 TP304L L-Type Finned Tube with AL1060 Fins is a specialized heat exchanger component designed for efficient heat transfer in various industrial applications. Here's a detailed breakdown:
1. Base Tube: ASTM A249 TP304L
Material: Stainless Steel 304L (low carbon variant, ≤0.03% carbon).
Standard: ASTM A249 specifies seamless and welded austenitic steel tubes for boilers, heat exchangers, and condensers.
(1). Chemical Composition (Weight %)
The composition complies with ASTM A249/A249M and ASTM A312/A312M (for seamless/welded pipes).
| Element | TP316L Requirements (%) | Typical Values (%) |
| Carbon (C) | ≤ 0.035 (max) | 0.02 – 0.03 |
| Manganese (Mn) | ≤ 2.00 (max) | 1.00 – 1.50 |
| Silicon (Si) | ≤ 1.00 (max) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.045 (max) | 0.020 – 0.040 |
| Sulfur (S) | ≤ 0.030 (max) | 0.010 – 0.020 |
| Chromium (Cr) | 16.0 – 18.0 | 16.5 – 17.5 |
| Nickel (Ni) | 10.0 – 14.0 | 10.5 – 12.5 |
| Molybdenum (Mo) | 2.0 – 3.0 | 2.2 – 2.8 |
| Nitrogen (N) | ≤ 0.10 (max) | 0.02 – 0.06 |
| Iron (Fe) | Balance | ~65 – 70 |
Key Notes:
Low Carbon (≤0.035%): Reduces carbide precipitation during welding, improving corrosion resistance in welded structures (hence "L" grade).
Molybdenum (2-3%): Enhances resistance to pitting and crevice corrosion, especially in chloride environments (e.g., seawater, chemical processing).
(2). Mechanical Properties (ASTM A249)
| Property | Requirements | Typical Values |
| Tensile Strength (MPa) | ≥ 485 | 500 – 620 |
| Yield Strength (MPa) | ≥ 170 | 200 – 300 |
| Elongation (% in 50mm) | ≥ 35 (for welded) | 40 – 50 |
| ≥ 40 (for seamless) | ||
| Hardness (Rockwell B) | ≤ 95 HRB (max) | 70 – 90 HRB |
Additional Notes:
Heat Treatment: Solution annealed at 1010–1120°C (1850–2050°F) followed by rapid cooling (quenching) to maintain corrosion resistance.
Impact Toughness: Excellent at cryogenic temperatures due to austenitic structure.
Weldability: Excellent (no post-weld heat treatment required).
2. L-Type Finned Tube
Fin Type: "L-Type" refers to fins that are embedded or wound into a groove on the tube's outer surface, ensuring strong mechanical bonding.
Advantages:
3. AL1060 Fins
Material: Aluminum 1060 (99.6% pure aluminum).
Properties:
4. Key Features or Benifits
✅ Corrosion Resistance: TP304L (internal) + AL1060 (external) combo suits harsh environments.
✅ Thermal Efficiency: Aluminum fins (235 W/m·K) enhance heat transfer vs. steel fins.
✅ Cost-Effective: Cheaper than all-stainless-steel finned tubes while maintaining performance.
✅ Durable Bonding: L-Type fins resist vibration/thermal expansion loosening.
5. Why This Combination?
Cost-Effectiveness: Aluminum fins are cheaper than stainless steel while providing superior thermal performance.
Durability: TP304L resists oxidation and pitting, while AL1060 forms a protective oxide layer.
The ASTM A249 TP304L L-Type Finned Tube with AL1060 Fins is a high-efficiency heat transfer component widely used in industries where corrosion resistance, thermal performance, and durability are critical. Below are its key applications:
1. Air-Cooled Heat Exchangers (ACHEs)
2. Waste Heat Recovery Systems
3. Refrigeration & Condensers
4. Industrial Boilers & Economizers
5. Marine & Offshore Applications
6. Renewable Energy Systems
