ASTM SA213 T22 Serrated Finned Tubes Manufacturer
Product Overview
ASTM SA213 T22 Serrated Finned Tubes are premium heat transfer components engineered for high-temperature and high-pressure service environments. Manufactured from ASTM SA213 Grade T22 seamless ferritic alloy steel tubing and fitted with continuously welded serrated fins, these tubes are widely used in boilers, economizers, air heaters, waste heat recovery units, petrochemical plants, and power generation facilities.
The serrated fin design enhances thermal performance by disrupting the boundary layer of flowing gases, creating increased turbulence and improving convective heat transfer efficiency. Combined with the excellent creep resistance and oxidation resistance of ASTM SA213 T22 alloy steel, these finned tubes provide reliable long-term operation in demanding industrial applications.
What Are Serrated Finned Tubes?
Serrated finned tubes are manufactured by welding specially notched (serrated) fins onto the external surface of a tube in a continuous helical pattern. The segmented fin profile increases airflow turbulence while reducing thermal resistance across the fin surface.
Compared with plain solid fin tubes, serrated finned tubes offer:
- Higher heat transfer coefficients
- Improved gas-side thermal efficiency
- Better performance under fouling conditions
- Reduced equipment size requirements
- Lower overall operating costs
- Enhanced heat recovery efficiency
For high-temperature heat recovery systems, ASTM SA213 T22 is one of the most widely specified materials due to its excellent strength retention and corrosion resistance.
Key Features
Excellent High-Temperature Strength
The chromium-molybdenum alloy composition provides outstanding creep resistance and mechanical stability at elevated operating temperatures.
Enhanced Heat Transfer Performance
Serrated fins create controlled turbulence, increasing heat transfer rates compared with conventional solid fin designs.
Superior Weld Integrity
High-frequency resistance welding ensures a continuous metallurgical bond between fin and tube, minimizing thermal contact resistance.
Oxidation and Scaling Resistance
The chromium content improves resistance to oxidation and scaling in high-temperature flue gas environments.
Long Service Life
Designed for continuous operation in severe industrial processes where reliability and thermal efficiency are critical.
Flexible Design Options
Available in customized dimensions, fin configurations, and material combinations to suit specific process requirements.
Typical Applications
ASTM SA213 T22 Serrated Finned Tubes are commonly utilized in:
- Boiler Economizers
- Air Preheaters
- Heat Recovery Steam Generators (HRSG)
- Waste Heat Recovery Systems
- Refinery Process Heaters
- Petrochemical Furnaces
- Power Plant Heat Exchangers
- Thermal Oil Heaters
- Industrial Exhaust Gas Recovery Units
- Process Gas Cooling Equipment
Standard Manufacturing Range
| Parameter |
Standard Range |
| Base Tube Material |
ASTM SA213 T22 |
| Tube Outside Diameter |
19.05 mm – 63.50 mm |
| Tube Wall Thickness |
2.0 mm – 8.0 mm |
| Tube Length |
Up to 18,000 mm |
| Fin Material |
Carbon Steel, Alloy Steel, Stainless Steel |
| Fin Thickness |
0.8 mm – 2.0 mm |
| Fin Height |
8 mm – 25 mm |
| Fin Pitch |
3 mm – 12 mm |
| Fin Density |
80 – 330 Fins/Meter |
| Fin Type |
Helical Serrated Welded Fin |
| Manufacturing Method |
High Frequency Resistance Welding (HFW) |
Custom dimensions can be manufactured according to project specifications and international standards.
ASTM SA213 T22 Chemical Composition
| Element |
Composition (%) |
| Carbon (C) |
0.05 – 0.15 |
| Manganese (Mn) |
0.30 – 0.60 |
| Phosphorus (P) |
≤ 0.025 |
| Sulfur (S) |
≤ 0.025 |
| Silicon (Si) |
≤0.50 |
| Chromium (Cr) |
1.90 – 2.60 |
| Molybdenum (Mo) |
0.87 – 1.13 |
The chromium and molybdenum alloying elements contribute significantly to high-temperature strength, oxidation resistance, and long-term creep performance.
ASTM SA213 T22 Mechanical Properties
| Property |
Minimum Value |
| Tensile Strength |
415 MPa |
| Yield Strength |
205 MPa |
| Elongation |
30% |
| Hardness |
Typically ≤ 163 HB |
| Maximum Recommended Service Temperature |
Approx. 600°C |
Mechanical properties may vary depending on heat treatment conditions and production requirements.
Manufacturing Process
Our ASTM SA213 T22 Serrated Finned Tubes are produced using a controlled manufacturing process:
- Incoming raw material inspection and certification verification.
- Precision preparation of ASTM SA213 T22 seamless tubes.
- Production of serrated fin strips according to design specifications.
- Continuous helical fin winding.
- High-frequency resistance welding of fins to tube surface.
- Weld seam monitoring and quality verification.
- Dimensional inspection and performance testing.
- Surface cleaning, preservation, marking, and packaging.
This process ensures a strong fin-to-tube bond and optimal thermal conductivity.
Inspection & Quality Assurance
Every batch undergoes comprehensive testing and inspection procedures to ensure compliance with customer specifications and international standards.
Material Verification
- Raw material certificate review
- Heat number traceability
- Positive Material Identification (PMI) upon request
Dimensional Inspection
- Outside diameter measurement
- Wall thickness verification
- Fin height measurement
- Fin pitch inspection
- Tube straightness verification
- Length tolerance inspection
Mechanical Testing
- Tensile Test
- Hardness Test
- Flattening Test
- Expansion Test (where applicable)
Non-Destructive Testing (NDT)
- Eddy Current Testing (ECT)
- Ultrasonic Testing (UT)
- Dye Penetrant Testing (PT)
- Magnetic Particle Testing (MT) upon request
Weld Quality Inspection
- Fin-to-tube bond examination
- Continuous weld monitoring
- Fin attachment integrity testing
Pressure Testing
- Hydrostatic Testing according to ASTM requirements when specified.
Advantages of ASTM SA213 T22 Serrated Finned Tubes
- Increased external heat transfer area
- Improved thermal efficiency in gas-side applications
- Excellent resistance to creep deformation
- Reduced fouling impact compared to solid fin tubes
- Superior performance in high-temperature environments
- Lower fuel consumption through enhanced heat recovery
- Reduced equipment footprint
- Extended operational service life
Available Documentation
Upon shipment, the following documentation can be provided:
- EN 10204 3.1 Material Test Certificate
- Chemical Analysis Report
- Mechanical Test Report
- Dimensional Inspection Report
- Hydrostatic Test Report
- PMI Report (Optional)
- NDT Reports
- Packing List
- Certificate of Conformity
Why Choose Our ASTM SA213 T22 Serrated Finned Tubes?
Our serrated finned tubes are engineered to maximize thermal efficiency while maintaining exceptional durability under severe operating conditions. Through advanced welding technology, strict quality control, and complete material traceability, we supply finned tube solutions that meet the demanding requirements of power generation, petrochemical processing, refinery operations, and industrial heat recovery systems worldwide.
Whether your project requires standard dimensions or fully customized finned tube designs, our ASTM SA213 T22 Serrated Finned Tubes deliver reliable heat transfer performance, reduced maintenance costs, and long-term operational value.
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