High Frequency Welded Finned Tube ASTM A335 P22 For Industrial Economizers
High Frequency Welded Finned Tube ASTM A335 P22 For Industrial Economizers
ASTM A335 Specification for seamless ferritic alloy steel pipe for high temperture service.
High-frequency welded spiral finned tubes are formed by welding the base tube and the rotating strip-shaped fins on the tube surface using the high-frequency welding process. The weldable materials include carbon steel, low-carbon steel and stainless steel.
The application scope of alloy steel HFW finned tubes covers power plants, oil refineries, waste incineration plants and heavy industries, making it the preferred choice for energy-saving heat recovery systems.
Chemical Composition max %
| Grade | C | Mn | P | S | Si | Cr | Mo |
| P22/K21590 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50 | 1.90-2.60 | 0.87-1.13 |
Mechanical Properties
| Grade | Tensile Strength,min | Yield Strength (0.2%Offset,min) | Elongation |
| P22/K21590 | 66ksi,415MPa | 30ksi,205MPa | 30% |
Applications
Alloy steel high-frequency welded finned tubes are widely used in industrial economizers to enhance the thermal recovery efficiency of boilers, furnaces and process heaters, reduce fuel consumption and improve overall thermal performance. Due to their sturdy structure, high-temperature resistance and anti-corrosion properties, economizers can be applied in harsh industrial environments.
Boiler Flue Gas Heat Recovery
HRSG (Heat Recovery Steam Generators) in Power Plants
Process Heaters & Furnace Economizers
Cement & Steel Plant Economizers
Waste Incineration Plants
Specifications For Various Types Of Finned Tubes That We Can Offer
| Type | Description | Base tube | Fin specification (mm) | ||
| O.D. (mm) | Fin pitch | Fin height | Fin thick | ||
| Embedded | G-type fin tueb | 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 | 8.0~30 | <2.5 | / | |
| 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 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 | |
| Studed fin tube | 25-219 | 8~30 | 5~35 | φ5-20 | |
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