ASTM A335 P9 Serrated Finned Tubes for Air Preheaters are engineered for high-temperature heat recovery systems operating under demanding service conditions. Manufactured with an ASTM A335 P9 seamless alloy steel base tube and carbon steel (CS) serrated fins, these finned tubes provide an excellent balance of thermal efficiency, mechanical strength, and long-term reliability.

The serrated fin design interrupts the airflow boundary layer, increasing turbulence and improving heat transfer performance compared with solid fin designs. This construction also helps reduce dust accumulation, making it suitable for flue gas applications where fouling is a concern.

These finned tubes are widely used in air preheaters, economizers, waste heat recovery units, and industrial heat exchangers where operating temperatures exceed the capabilities of conventional carbon steel tubes.

Product Features

ASTM A335 P9 seamless alloy steel base tube for elevated temperature service
Carbon steel serrated fins with excellent heat transfer performance
Improved thermal efficiency through enhanced gas-side turbulence
Reduced fouling and better self-cleaning characteristics
Suitable for continuous high-temperature flue gas applications
Excellent resistance to oxidation, creep, and thermal fatigue
Available in customized dimensions and fin configurations
Manufactured under strict quality control procedures

Typical Applications

ASTM A335 P9 serrated finned tubes are commonly installed in high-temperature heat recovery equipment, including:

Air Preheaters (APH)
Heat Recovery Steam Generators (HRSG)
Boiler Economizers
Waste Heat Boilers
Refinery Fired Heaters
Petrochemical Process Heaters
Power Plant Heat Recovery Systems
Industrial Waste Heat Recovery Units
Cement Plant Heat Recovery Equipment
Steel Plant Flue Gas Heat Exchangers

Size Range

Item	Standard Range
Base Tube OD	25.4–63.5 mm (1"–2-1/2")
Base Tube Wall Thickness	2.5–8.0 mm
Tube Length	Up to 18,000 mm
Fin Height	8–25 mm
Fin Thickness	0.8–1.5 mm
Fin Pitch	3.5–10 mm
Fin Material	Carbon Steel (CS)
Base Tube Material	ASTM A335 P9
Manufacturing Process	High Frequency Resistance Welded (HFW/HFW)

Custom dimensions are available upon request.

ASTM A335 P9 Chemical Composition

Element	Content (%)
Carbon (C)	0.15 max
Manganese (Mn)	0.30–0.60
Silicon (Si)	0.25–1.00
Chromium (Cr)	8.00–10.00
Molybdenum (Mo)	0.90–1.10
Phosphorus (P)	0.025 max
Sulfur (S)	0.025 max

Values are based on ASTM A335 material requirements.

ASTM A335 P9 Mechanical Properties

Property	Value
Tensile Strength	≥ 585 MPa
Yield Strength	≥ 415 MPa
Elongation	≥ 20%

Ratings & Review

Overall Rating

4.0

Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings

5 stars

4 stars

100%

3 stars

2 stars

1 stars

All Reviews

Ahmed Al-Rashid

Kuwait Mar 3.2026

Helpful (2)

Tube ends were clean, dimensions consistent. Our crew didn't run into fit-up issues.

P*l

India Sep 16.2025

Helpful (3)

No leaks, no fin damage, performance consistent. Heat transfer hasn't dropped, so fouling doesn't seem to be a problem yet.

Godfrey

Uganda Aug 20.2025

Helpful (3)

For power plant boilers, especially in industrial settings like ours, these tubes work. Good heat transfer, holding up well.

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Baffle Plate

Tubesheet

products details

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube