YUHONG HOLDING GROUP CO., LTD
YUHONG HOLDING GROUP CO., LTD
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HF Welding Solid Fin Tubes ASTM A312 TP304H For Waste Heat Recovery Units
ASTM A312 is a standard specification for seamless, welded, and heavily cold worked austenitic stainless steel pipes.
Chemical Composition (%)
| Grade | C | Mn | P | S | Si | Cr |
| TP304H | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 18.00-20.00 |
Composition:
18-20% Chromium (Cr) – Provides oxidation resistance.
0.04-0.10% Carbon (C) – Improves creep resistance at high temps.
Mechanical Properties
| Grade | Tensile Strength,min | Yield Strength (0.2%Offset,min) |
| 75ksi (515 MPa) | 30ksi (205 MPa) | |
| TP304H | Elongation min. % | Heat Treating Temperature min. |
| 35% | 1900°F [1040°C] |
Corrosion Resistance: Excellent against oxidation, sulfur, and acidic flue gases.
Mechanical Strength: Good creep & stress rupture resistance (superior to standard 304).
Waste Heat Recovery Units (WHRUs) capture and reuse thermal energy from industrial exhaust gases, improving energy efficiency and reducing emissions. HF-welded solid fin tubes made of ASTM A312 TP304H stainless steel play a critical role in these systems due to their high-temperature strength, corrosion resistance, and efficient heat transfer capabilities.
304H stainless steel maintains strength at high temperatures (up to 900°C), ensuring long-term performance.Solid fins provide a larger heat exchange surface area than bare tubes, increasing thermal efficiency.
Applications in WHRU Systems
Heat Recovery Steam Generators (HRSGs)
Economizers
Air Preheaters
Flue Gas Condensers
HF-welded solid fin tubes (ASTM A312 TP304H) are essential for efficient, durable WHRUs in industries such as:Power generation (HRSGs, economizers) / Petrochemical (fired heaters, reformers) / Cement, steel, and waste incineration (flue gas heat recovery).
Specifications
| Type | Description | Base tube | Fin specification (mm) | ||
| O.D. (mm) | Fin pitch | Fin height | Fin thick | ||
| Embedded | G-type fin tube | 16-63 | 2.1-5 | <17 | ~0.4 |
| Extruded | Single metal / Combined metal | 8-51 | 1.6-10 | <17 | 0.2-0.4 |
| Low fin tube / T-type fin tube | 10-38 | 0.6-2 | <1.6 | ~0.3 | |
| Bamboo tube / corrugated tube | 16-51 | 8-30 | <2.5 | ~0.3 | |
| Wound | L / KL / LL type fin tube | 16-63 | 2.1-5 | <17 | ~0.4 |
| String | String fin tube | 25-38 | 2.1-3.5 | <20 | 0.2-0.5 |
| U-type | U-type fin tube | 16-38 | / | / | / |
| Welding | HF-welding fin tube | 16-219 | 3-25 | 5-30 | 0.8-3 |
| H/HH type fin tube | 25-63 | 8-30 | <200 | 1.5-3.5 | |
| Serrated spiral fin tube | 25-219 | 2-7 | <38.1 | 0.9-2.0 | |
| Studed fin tube | 25-219 | 8-30 | 5-35 | φ5-20 | |