316L Stainless Steel Finned Tubes

Product Highlights

1. Multiple fin‑tube construction types available: HFW high‑frequency welded, laser‑welded, L‑foot, KL‑type, LL‑type, G‑embedded, crimped/spiral‑wound, bimetal extruded, integral low‑fin, stud/pin finned tube
2. Wide dimensional range: Base tube OD 15.88‑273 mm; fin height 4.0‑50 mm; fin thickness 0.3‑1.5 mm; customizable fin pitch, fin density and tube length up to 15 m; plain or beveled tube ends
3. Flexible material matching: Base tube in carbon steel, alloy steel, stainless steel, copper‑nickel alloy; fin materials include aluminum, copper, carbon steel, stainless steel, Cu‑Ni alloy for diverse temperature‑corrosion working conditions
4. Strict full‑set production workflow: raw tube acceptance → finning → stress‑relieving → straightening → cutting → deburring → air‑leak & eddy‑current test → ultrasonic cleaning → final inspection
5. Advanced bonding options: metallurgical welding (HFW / laser‑welded), mechanical knurling lock‑in, embedded grooved locking, bimetal extrusion for high‑vibration & thermal‑cycling environments
6. Greatly enlarged heat‑exchange surface area; heat‑transfer efficiency can reach 2‑3 times compared with bare smooth tubes
7. Full custom support: fin geometry, material combination, tube length, end treatment per customer drawings; MTC 3.1 inspection documents are available
8. Large daily production capacity over 500 meters; suitable for small trial orders and large‑scale heat‑exchanger project bulk procurement

Product Overview

Finned steel tube (fin tube) consists of a seamless base tube plus externally attached fins to dramatically enlarge heat‑exchange surface area, widely used for heat transfer, cooling and heating equipment. We supply a complete portfolio of finned‑tube construction solutions: high‑frequency welded(HFW), laser‑welded, L‑type / KL‑type / LL‑type wound fin, G‑type embedded fin, crimped spiral fin, bimetal extruded fin, integral low‑fin tube and stud(pin) finned tube.

Different manufacturing technologies adapt to different temperature, vibration and corrosion environments: HFW / laser‑welded finned tubes realize metallurgical bonding for heavy‑vibration working conditions; L/KL/LL wound‑on series provide economical mechanical bonding and partial base‑tube corrosion protection; G‑type embedded fin performs well under high‑temperature cyclic service; bimetal extruded fin achieves gap‑free contact and good anti‑corrosion performance; stud fin tube creates turbulent flow for high‑efficiency heat exchange.

Base‑tube and fin materials can be freely combined: carbon‑steel for general power‑plant service; alloy‑steel for high‑temperature boiler equipment; stainless‑steel for moderate‑corrosion chemical environment; copper‑nickel alloy for seawater‑cooling marine systems. All products pass air‑leak, eddy‑current and dimension inspection before delivery, supporting further cutting, bending and precision machining for heat‑exchanger assembly.

Material Grade Characteristics

Carbon Steel (ASTM A179 / A192 / A106 Gr.B)

Economical general‑purpose base‑tube material. Good weldability and mechanical strength. Suitable for air preheaters, economizers and low‑to‑medium‑temperature heat‑exchange equipment. Surface anti‑rust coating is recommended for humid environments.

Cr‑Mo Alloy Steel (ASTM A213 T11 / T22 / T91)

Chromium‑molybdenum heat‑resistant alloy steel. Excellent high‑temperature creep‑resistance and oxidation‑resistance, designed for high‑temperature boiler, furnace and waste‑heat‑recovery finned‑tube service.

Austenitic Stainless Steel (304 / 316L / 321)

Good comprehensive corrosion‑resistance. 316L containing molybdenum performs well under chloride‑containing media for petrochemical and marine heat‑exchangers; 321 titanium‑stabilized grade resists inter‑granular corrosion under medium‑high‑temperature cyclic operation.

Copper‑Nickel Alloy (C70600 Cu‑Ni 90/10, C71500 70/30)

Outstanding seawater‑erosion resistance and high thermal conductivity. Mainly used for marine cooling, offshore platform heat‑exchange systems.

Aluminum Fin Material (AL1060)

High thermal conductivity, light‑weight, low‑cost, widely adopted for extruded & wound‑on fins; suitable for working temperature below 280 °C.

Copper Fin Material

Superior heat‑conduction performance, good ductility, fit for refrigeration and low‑temperature high‑efficiency heat‑transfer equipment.

Chemical Composition (Weight %)

Note: Aluminum / copper fin material follows respective non‑ferrous metal standard specifications.

Related Material Grades

1. Carbon‑Steel Base Tube: ASTM A179, A192, A106 Gr.B
2. Heat‑Resistant Alloy Base Tube: ASTM A213 T11, T22, T91
3. Stainless‑Steel Base Tube: 304, 304L, 316L, 321, 2205 duplex
4. Copper‑Nickel Alloy Base Tube: C70600(90/10), C71500(70/30)
5. Fin Material Options: Al1060 aluminum, C11000 copper, carbon steel strip, 304 / 316L stainless strip
6. Matching Heat‑Exchange Components: seamless boiler tube, U‑bend heat‑exchange tube, tube sheet, baffle

Key Advantages

Multiple Construction‑Type Options for Working‑Condition Matching

HFW / laser‑welded for vibration‑intensive equipment; L/KL/LL wound‑on for cost‑sensitive air‑coolers; G‑embedded for high‑temperature cycles; bimetal extruded for anti‑corrosion air‑cooler units; stud‑fin for enhanced turbulent heat‑transfer.

Remarkable Heat‑Transfer Improvement

External fins greatly enlarge heat‑exchange area; stud‑fin tube reaches 2‑3 times heat‑transfer performance compared with bare smooth base tube.

Reliable Fin‑to‑Tube Bonding

Metallurgical welding, knurl mechanical interlock, groove‑embedded locking and bimetal integral extrusion are available to avoid fin loosening under vibration and repeated thermal cycling.

Flexible Material Combination

Base‑tube and fin materials can adopt dissimilar‑metal collocation: e.g. alloy‑steel base tube with aluminum fins to balance high‑temperature pressure‑bearing capacity and high thermal conductivity.

Strict Complete‑Process Inspection

Air‑leak test, eddy‑current flaw detection, UT, dimensional and visual inspection for every batch; guarantee zero leakage and stable fin bonding quality for heat‑exchanger assembly.

Strong Customization Capacity

Base‑tube OD, fin height / thickness / pitch, tube length, tube‑end form all can be customized per engineering drawings, supporting prototype sample and mass‑volume project supply.

Typical Applications

• Power‑Plant Energy Equipment: Air preheater, economizer, waste‑heat‑recovery heat‑exchanger, boiler flue‑gas cooling finned tubes
• Petrochemical Industry: Process air coolers, condenser & evaporator fin tubes, high‑temperature waste‑heat recovery devices
• Marine & Off‑shore Engineering: Seawater cooling heat‑exchanger (Cu‑Ni finned tube), offshore platform air‑cooling equipment
• HVAC & Refrigeration: Air heater, air‑conditioning condenser, drying‑equipment heat‑exchange components
• Metallurgy & Building‑Material Industry: Furnace waste‑heat recovery, flue‑gas heat‑recycling finned‑tube bundles
• Machinery General Equipment: Oil cooler, hydraulic‑system cooling unit, industrial drying system heat‑exchange assemblies

Processing Service

We provide integrated forging and precision machining services, and can produce finished components strictly according to customer drawings:

Turning, milling, planing, drilling, boring, grinding

Gear cutting, CNC precision machining

Sizing cutting, surface treatment and finishing

We have supplied a wide range of forged and machined parts including shafts, cylinders, hollow bars, pistons, tube sheets, rings and disc bearings to customers worldwide.

Quality Assurance

We have a professional QC inspection team and complete testing equipment to ensure stable and reliable product quality:

Ultrasonic testing (UT) for internal defects

Tensile and hardness testing for mechanical properties

High‑precision dimensional measurement

Spectrometer for chemical composition verification

Metallographic microstructure inspection

Every batch of products undergoes strict inspection before delivery to meet the quality requirements of various engineering projects.

Packing & Delivery

Packing

Inner packaging: waterproof polybag for moisture and dust protection

Outer packaging: reinforced wooden case / wooden pallet, suitable for long‑distance international transportation

Custom packaging solutions available upon request

Extra protection: Plastic protective caps for tube ends; separated cushioning between finned tubes to prevent fin bending and scratching during transit.

Lead Time

Normally 10 – 45 days after receipt of advance payment

Exact delivery time depends on order quantity, specification complexity and machining requirements

Standard‑spec finned‑tube production: 15‑35 working‑day lead‑time.