1. Product Overview

ASTM A335 P22 Studded Finned Tubes for Industrial Heating Furnaces

ASTM A335 P22 Studded Finned Tubes are manufactured using 2.25Cr-1Mo alloy steel seamless pipes and are designed for high-temperature heat transfer applications in industrial heating furnaces. They are primarily installed in furnace convection sections to recover thermal energy from hot flue gases and improve overall furnace efficiency.

The welded studs increase the effective external heat transfer surface area, enhancing heat exchange between flue gas and the tube-side medium. With good high-temperature strength, creep resistance, and oxidation resistance, P22 alloy steel is suitable for demanding thermal conditions in industrial furnace systems.

Our P22 studded tubes can be customized in tube dimensions, stud diameter, height, spacing, and arrangement according to customer drawings and project specifications.

2. Applications

ASTM A335 P22 Studded Finned Tubes are mainly used in high-temperature industrial heating and heat recovery systems.

Industrial Heating Furnaces

• Convection Sections: Recover heat from hot flue gases before they are discharged, improving furnace thermal efficiency.

• Refinery Process Heaters: Transfer recovered heat to process fluids and help reduce fuel consumption.

• Petrochemical Furnaces: Support heat recovery in high-temperature chemical processing facilities.

• Furnace Waste Heat Recovery: Increase the effective heat transfer area to improve energy utilization.

• Industrial Thermal Processing Equipment: Provide reliable heat exchange under demanding operating conditions.

3. Chemical Composition & Mechanical Properties

The following values are based on ASTM A335 Grade P22 base pipe requirements. Actual material compliance shall be verified against the applicable edition of the standard and the supplied MTC.

3.1 Chemical Composition

3.2 Mechanical Properties

4. Operating Conditions & Material Advantages

4.1 Typical Operating Conditions

P22 studded tubes are designed for high-temperature furnace heat recovery applications. Actual operating limits depend on furnace design, tube-side pressure, flue-gas composition, metal temperature, and engineering calculations.

4.2 Why Choose ASTM A335 P22?

• High-Temperature Strength: Suitable for elevated-temperature service under mechanical loading.

• Creep Resistance: Chromium-molybdenum alloy composition provides good resistance to long-term deformation at elevated temperatures.

• Oxidation Resistance: Chromium improves resistance to oxidation in high-temperature environments.

• Enhanced Heat Transfer: Welded studs increase the external heat transfer surface area.

• Customized Design: Stud dimensions, spacing, and arrangements can be tailored to furnace requirements.

5. Manufacturing Standards & Quality Inspection

Applicable Standards

The base tube shall comply with ASTM A335 Grade P22. Stud welding procedures, stud materials, dimensional tolerances, and inspection acceptance criteria shall follow the approved project specifications.

Quality Inspection

Documentation Available

• EN 10204 3.1 Material Test Certificate, subject to order requirements.

• Chemical composition and mechanical test reports.

• Dimensional inspection reports.

• Welding procedure and welder qualification records, where applicable.

• NDT reports, when specified.