Customization:	Available
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Warranty:	1 Years

Specification	T11	T12	T22
Standard	ASTM A213 / ASME SA213	ASTM A213 / ASME SA213	ASTM A213 / ASME SA213
Outer Diameter Range	Usually 12.7 - 273.05 mm	Usually 12.7 - 273.05 mm	Usually 12.7 - 273.05 mm
Wall Thickness Range	Varies based on application, typically 1.65 - 12.7 mm	Varies based on application, typically 1.65 - 12.7 mm	Varies based on application, typically 1.65 - 12.7 mm
Finned Structure	Integral or welded fins. Fin height can range from 6 - 25 mm, and fin pitch from 1.5 - 5 mm.	Integral or welded fins. Fin height can range from 6 - 25 mm, and fin pitch from 1.5 - 5 mm.	Integral or welded fins. Fin height can range from 6 - 25 mm, and fin pitch from 1.5 - 5 mm.
Tube Length	Customizable, commonly 3 - 12 m	Customizable, commonly 3 - 12 m	Customizable, commonly 3 - 12 m

Property	T11	T12	T22
Yield Strength	≥ 205 MPa	≥ 170 MPa	≥ 205 MPa
Tensile Strength	415 - 585 MPa	380 - 515 MPa	485 - 655 MPa
Elongation	≥ 30%	≥ 30%	≥ 20%
Impact Resistance	Good at normal temperatures. Can be enhanced with appropriate heat treatment.	Good at normal temperatures. Can be enhanced with appropriate heat treatment.	Good at normal temperatures. Can be enhanced with appropriate heat treatment.

Process Step	Details
Tube Manufacturing	Seamless or welded tubes are produced first according to ASTM A213 standards. For seamless tubes, the billet is pierced and rolled. Welded tubes are made by forming steel strips and welding the longitudinal seam.
Fin Attachment	Integral fins can be formed by machining or extrusion directly on the tube surface. Welded fins are attached to the tube using high - precision welding techniques, ensuring strong bond and uniform heat transfer.
Heat Treatment	Tubes may undergo normalizing, tempering, or annealing processes to optimize their mechanical properties. Heat treatment helps in relieving internal stresses, improving toughness, and enhancing corrosion resistance.

Aspect	Performance
Overall Heat Transfer Coefficient	Significantly higher than plain tubes due to the extended surface area provided by fins. Can range from 100 - 1000 W/(m²·K) depending on the fluid properties, flow rate, and fin design.
Efficiency	Finned tubes can achieve heat transfer efficiencies of up to 90% or more, depending on the fin geometry and operating conditions. This high efficiency leads to reduced energy consumption and smaller heat exchanger sizes.

Environment	Performance
General Industrial Atmosphere	Good corrosion resistance due to the presence of chromium and molybdenum in the alloy. Forms a protective oxide layer on the surface.
Steam - containing Environments	Resistant to steam corrosion, making them suitable for use in boilers and steam heat exchangers.
Mildly Corrosive Fluids	Can withstand corrosion from mildly acidic or alkaline fluids. However, in highly corrosive media, additional corrosion protection measures may be required.

Industry	Applications
Power Generation	- Boiler tubes in coal - fired, gas - fired, and oil - fired power plants. - Heat exchangers for pre - heating air, water, or steam.
Chemical	- Heat exchangers for cooling, heating, and condensing various chemical fluids. - Reactor cooling systems.
Petrochemical	- Distillation columns and heat recovery systems. - Heat exchangers in refinery processes.
HVAC	- Air - handling units for heating and cooling. - Condensers and evaporators in refrigeration systems.

Control Measure	Description
Raw Material Inspection	Test the chemical composition and mechanical properties of incoming steel materials to ensure compliance with ASTM A213 standards.
In - process Monitoring	Monitor the tube manufacturing, fin attachment, and heat treatment processes. Check dimensions, weld quality, and surface finish at various stages.
Final Product Testing	Conduct non - destructive testing such as ultrasonic testing, radiographic testing to detect internal defects. Perform hydrostatic testing to ensure pressure - tightness. Test the heat transfer performance in simulated operating conditions. Products must meet all relevant international standards and may obtain certifications like ISO 9001.

Advantage	Explanation
Enhanced Heat Transfer	The finned structure increases the surface area, leading to more efficient heat transfer, which is crucial for energy - intensive processes.
Compact Design	Due to high heat transfer efficiency, heat exchangers using these finned tubes can be made more compact, saving space and reducing installation costs.
Good Mechanical and Corrosion Resistance	The alloy composition provides a balance of strength and corrosion resistance, suitable for a wide range of operating conditions.
Versatility	Applicable in various industries with different temperature, pressure, and fluid requirements.

ASTM A213 T11/T12/T22 Finned Tubes Heat Transfer

Basic Info.