Finned Tube Stainless Steel Welded Pipe — G-Type Fin Tube for Industrial Radiators

Material

This product is a G-Type (embedded) finned tube composed of a stainless steel base tube with external fins securely embedded into helical grooves on the tube’s external surface. The base tube material is typically austenitic stainless steel (for example grades such as TP 304, TP 316, TP 321, etc) or other alloy steels suitable for welded fin-tube manufacture. The fins may be made of aluminum, copper or stainless steel strip depending on duty conditions.
The tube is welded (or seamless/fabricated) and then finned via a tension-wound strip which is locked into the machined groove, providing a mechanically robust fin attachment.

Specification

• Tube Outer Diameter (OD): typical range 15.88 mm to 50.80 mm (⅝″ to 2″) for G-Type embedded fin tubes.

• Tube Wall Thickness: typical for G-Type tubes base tube wall thickness ≥ ~2.1 mm up to ~3.5 mm depending on design.

• Fin Height: e.g., 6.35 mm to 25.4 mm (¼″ to 1″) for embedded fin tubes.

• Fin Thickness: about 0.3 mm to 0.6 mm for G-type fin strip.

• Fin Pitch: for G-type typical fin pitch ~2.1 mm minimum (~12 fins per inch) or tailored per thermal duty.

• Length: Up to ~18 m (≈60 ft) maximum tube length in some manufacturers.

Key Features (Main Characteristics)

• The fin strip is embedded into a helical groove cut in the base tube (groove depth ~0.2 – 0.4 mm) and then the displaced tube wall material is rolled back to lock the fin foot. This creates a very tight fin-to-tube contact and large contact area, resulting in high thermal conductivity at the fin-tube interface.

• Excellent heat transfer performance due to increased outside surface area and low contact thermal resistance.

• High temperature capability: some G-Type finned tubes are rated for service up to ~450 °C (≈750 °F).

• Good mechanical integrity: the embedded fin design provides excellent bond strength and resistance to vibration and thermal cycling compared with wrapped fin types.

• Suitable for welded base tubes and finning adds minimal thermal resistance, making it ideal for high duty industrial heat exchangers – e.g., radiators, gas coolers, air-cooled heat‐exchangers, petrochemical heat recovery.

Our Advantages

From a factory/manufacturer perspective, we are able to offer the following advantages which address key customer concerns:

• Precision fin-tube bonding and straightness control: Because the fin strip is embedded and rolled into the tubewall groove, we achieve high integrity fin-to-tube contact, reducing the risk of fin loosening or detachment under vibration or thermal cycling. Customers often ask: Will the fin strip detach over time? Our manufacturing process includes fin locking and post-assembly inspection (flattening, flaring, hydrostatic, nondestructive tests) to guarantee the bond.

• Tight tolerance and dimensional control (straightness, wall thickness, OD tolerance): For radiator and heat exchanger tubes, straightness and fin geometry consistency are critical for assembly and performance. Our welding/fabrication line monitors straightness, outer diameter variation, wall thickness beneath fin groove, and fin height/pitch. We maintain the effective base tube wall thickness under the groove to ensure structural integrity.

• Material traceability and standard compliance: We use specified stainless steel grades (e.g., TP 304, TP 316, TP 321) or customised alloy steels per customer duty, and full chemical and mechanical testing is carried out (tension, yield, elongation, hardness, flaring/flattening) in line with finned tube quality control.

• High thermal performance in demanding environments: By choosing stainless steel base tubes and/or corrosion‐resistant fin materials, we deliver finned tubes capable of operating in aggressive or high-temperature service (such as petrochemical, power, waste-heat recovery) where typical fin tubes would degrade.

• Customisable fin geometry (height, pitch, thickness) and base tube size: We can tailor fin height/fin pitch/fin material and tube dimension (OD/WT/length) to meet the thermal design and pressure/shear conditions of your radiator or heat exchanger, thereby optimising cost vs performance. This flexibility addresses the customer concern: Will the fin-tube size match my exchanger header and flow conditions?

• Welded tube/finned integration for reliability: Since our tubes are welded (or otherwise manufactured) and then finned, the base tube has consistent wall thickness, weld integrity and is capable of being fabricated into radiator bundles or finned‐tube coils. This addresses the concern of durability under thermal cycling and mechanical stress.

Chemical Composition

Mechanical Performance

Standards Compliance

• Base tube: For welded or seamless stainless steel tube, the specification may be ASTM A312 (Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes).

• Tube (heat-exchanger) version: ASTM A213 (Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes) covers grades TP 304, TP 304L, TP 316, TP 316L etc.

• For finned tubes in air‐cooled heat exchangers, one common acceptance criterion is API 661 (Air-Cooled Heat Exchangers for General Refinery Service). One manufacturer lists it as an acceptance criteria for G-type fin tube delivery condition.

• Manufacturing tolerances and nondestructive tests adhere to weld-tube/pressure vessel code requirements, e.g., ASME BPVC Section VIII for pressure vessel parts.

Application Fields

General Application Field

High‐efficiency heat exchanger tubes for industrial radiators, air‐cooled heat exchangers, waste‐heat recovery, condensers, economisers and any gas/air‐to‐liquid or air‐to‐gas heat transfer equipment where enhanced outside surface area and thermal performance are required.

Specific Uses

• Petroleum / Chemical & Petrochemical Industry: For cooling of process fluids, gas treating units, air‐cooled exchangers in refineries.

• Power Generation (fossil / nuclear / waste-heat): For air preheaters, exhaust gas condensing, large radiator bundles where finned tubes must withstand thermal cycling.

• Steel Industry / Blast Furnace / Converter Systems: Where hot flue gases must be cooled via finned tubes before further processing.

• Industrial Radiators / Condensers / HVAC / Compressor Coolers: For refrigerants (Freon, ammonia, propane) or gas cooling in process plants.

• Waste Incineration / Flue Gas Treatment: Where high temperature and corrosion‐resistant fin tubes are required.

Q: Are you trading company or manufacturer ?

A: manufacturer,also can do trading.

Q: How long is your delivery time?

A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock,

it is according to quantity.

Q: Do you provide samples? is it free or extra ?

A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?

A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact with me.