Product Specification

ASTM A335 P22 Studded Finned Tube with Carbon Steel (CS) Studs

As a critical component in severe-duty heat exchangers and fired heaters, the ASTM A335 P22 Studded Finned Tube with Carbon Steel (CS) Studs offers unparalleled thermal efficiency and mechanical durability. Designed to withstand high-temperature and high-pressure environments, this heavy-duty studded tube is the ultimate solution for the petrochemical, refining, and power generation industries.

Detailed Structure of A335 P22 Base Tube and Carbon Steel Fins

Our studded finned tubes are engineered for maximum heat transfer and structural integrity. The construction consists of three critical elements:

• The Base Tube (ASTM A335 P22 Alloy Steel): The core is made of seamless ferritic alloy-steel pipe (P22). This material contains Chromium (Cr) and Molybdenum (Mo), which provide exceptional high-temperature strength, creep resistance, and anti-corrosion properties.

• The Fins/Studs (Carbon Steel / CS): Cylindrical or elliptical carbon steel studs are arranged in a specific staggered pattern around the circumference of the tube. Carbon steel is selected for the studs to provide excellent thermal conductivity while remaining cost-effective.

• The Embedding & Welding Process: We utilize advanced Electric Resistance Welding (ERW) technology. A high-frequency current passes through the contact area of the base tube and the stud, heating them to a forging temperature. Pressure is then applied to seamlessly forge the CS studs onto the A335 P22 base tube. This process requires zero filler metal, resulting in a 100% metallurgical bond that ensures zero contact thermal resistance and prevents studs from shedding under thermal stress.

Chemical Composition of A335 P22 Base Tube and CS Studs

Strict adherence to material standards is vital for high-temperature operations. Below is the precise chemical composition of the A335 P22 alloy base tube and the standard Carbon Steel studs.

Table 1: Chemical Composition of ASTM A335 P22 Alloy Steel Base Tube (%)

Table 2: Typical Chemical Composition of Carbon Steel (CS) Studs (%) (Note: CS studs typically conform to ASTM A105 or equivalent low-carbon steel standards for optimal weldability)

Dimension & Tolerance Range for P22 & CS Studded Tubes

We manufacture according to international standards or custom client drawings. Our state-of-the-art machinery ensures precise dimensional control.

Table 3: Standard Specifications & Manufacturing Tolerances

Performance Advantages of A335 P22 + Carbon Steel Studded Pipes

Why do engineers prefer the A335 P22 Alloy + CS Stud combination for extreme environments?

• Superior Heat Transfer: The CS studs drastically increase the exterior surface area, maximizing heat dissipation and recovery in convection sections.

• Anti-Fouling & Self-Cleaning Design: Compared to high-fin or extruded finned tubes, studded tubes are highly resistant to ash fouling and soot buildup, making them ideal for dirty gas streams or heavy fuel oils.

• High-Temperature Stability: The A335 P22 base pipe retains its structural strength in temperatures exceeding 500∘C500^circtext{C}500∘C, while the strong ERW weld prevents the CS studs from separating under extreme thermal cycling.

• Cost-Efficiency: Combining a high-grade alloy base tube (P22) with economical carbon steel (CS) studs strikes the perfect balance between premium performance and project budget optimization.

Detailed Application Fields for A335 P22 Carbon Steel Studded Tubes

Due to their rugged construction, ASTM A335 P22 Studded Finned Tubes with CS Studs are the standard choice for the following industrial applications:

• Petrochemical Refineries: Convection sections of fired heaters, crude oil heaters, and vacuum furnaces.

• Power Generation: Utility boilers, economizers, and Waste Heat Recovery Units (WHRU).

• Chemical Processing: Gas coolers, heat exchangers handling highly corrosive or high-temperature internal fluids.

• Steel & Metallurgy: Flue gas heat recovery systems where heavy dust and ash are present.

Why Choose Us as Your P22 & CS Studded Finned Tube Manufacturer?

As a specialized manufacturer with decades of export experience in industrial heat transfer solutions, we guarantee value and reliability:

• Certified Quality: We operate under strict ISO 9001 and ASME quality control systems. Every A335 P22 studded tube undergoes rigorous testing, including hydrostatic tests, weld tension tests, and PMI (Positive Material Identification).

• Advanced Equipment: Our automated resistance welding lines ensure a 100% weld success rate with perfect stud alignment and minimal heat-affected zones (HAZ).

• Customization Experts: We can adjust stud density, heights, and patterns based on your specific thermal dynamic calculations.

• Export-Ready Packaging: To prevent oxidation or transit damage, all studded tubes are coated with anti-rust oil, desiccants are applied, and they are packed securely in fumigated wooden crates or steel frames.

Ready to upgrade your heat exchanger efficiency? Send us your drawings or technical requirements today! Our engineering sales team will provide a competitive quote for your ASTM A335 P22 Studded Finned Tubes with Carbon Steel Studs within 24 hours.