ASTM A335 P5 Alloy Steel Studded Fin Tube For Heat Exchanger

ASTM A335 P5 Studded Fin Tube

ASTM A335 P5 is a chromium-molybdenum alloy steel known for its good creep strength and oxidation resistance at elevated temperatures. Its key characteristic is the nominal 5% Chromium content, which provides improved resistance to sulfur-bearing atmospheres and higher temperature strength compared to lower alloy steels.

The ASTM A335 P5 Studded Fin Tube is a high-performance thermal component where studs (pins) are welded onto the base tube to create an extended heat transfer surface. This design is particularly effective in high-temperature and abrasive environments where conventional finned tubes might be unsuitable.

P5 Chemical Composition (%)

P5 Mechanical Properties 

Comparison with Related Grades

P5 vs. P11/P22:
P5, with ~5% Cr, offers superior oxidation resistance and high-temperature strength compared to P11 (1.25% Cr) and P22 (2.25% Cr), making it suitable for more severe service conditions.

P5 vs. P9/P91:
P9 (9% Cr) offers better oxidation resistance, while P91 (9% Cr with V, Nb) provides significantly higher creep strength. P5 serves as a cost-effective option for intermediate temperature ranges.

Key Features & Advantages

High-Temperature Strength: Maintains good mechanical strength and resistance to creep at temperatures up to approximately 600°C (1100°F).

Oxidation & Sulfidation Resistance: The 5% Cr content provides a stable protective scale, offering better resistance than carbon steel to oxidizing and sulfur-bearing environments.

Enhanced Heat Transfer: The studded design drastically increases the surface area, significantly improving heat transfer efficiency in gas-to-liquid applications.

Mechanical Durability: The welded studs create a robust structure capable of withstanding abrasive and high-gas-velocity conditions.

Proven Performance: A well-established material for high-temperature pressure service in accordance with ASME Boiler and Pressure Vessel Code.

Applications of the ASTM A335 P5 Studded Tube

1.Petrochemical Heaters: Used in furnace convection and radiant sections for cracking and reforming processes.

2.Chemical Process Heaters: As heat transfer tubes in direct-fired heaters handling corrosive process streams.

3.Waste Heat Boilers: In high-temperature sections for recovering energy from process flue gases.

4.Power Generation: For specific high-temperature heat recovery systems and boiler elements.

5.Syngas Coolers: In environments where temperature and corrosion resistance are critical.