Industrial stainless steel heat exchanger tubes are designed for corrosive media and high-cleanliness industrial heat transfer applications. Compared with copper tubes, stainless steel offers superior corrosion resistance, making it the preferred material for chemical acid/alkali media, seawater cooling, food-grade heat exchange, and pharmaceutical equipment.

Kenergy offers various grades of stainless steel tubes, including 304, 304L, 316, 316L, 2205 duplex, 2507 super duplex, 254SMO, and titanium. Available surface forms include smooth plain tubes, internally grooved tubes, externally finned tubes, and U-bent tubes. Each configuration can be customized according to specific corrosive environments and thermal performance requirements.

Stainless steel tubes for industrial heat exchangers

Core Advantages

Excellent Corrosion Resistance

316L offers outstanding resistance to chloride corrosion, while 2205 duplex steel provides excellent resistance to stress corrosion cracking and pitting in harsh environments.

Comprehensive Grade Selection

Large inventory of 304/304L, 316/316L, 2205, 2507, 254SMO, and titanium – each grade meets specific corrosion and temperature requirements.

Multiple Surface Configurations

Available in smooth tubes, internal grooves, external fins, or U-bend tubes to meet different heat transfer and mechanical design requirements.

Cleanliness Grade Options

Food and pharmaceutical grade internal/external surface polishing up to Ra ≤0.4μm, meeting strict hygiene standards for WFI and pure steam systems.

Technical Parameters

Outer Diameter (mm)	Bottom Wall (mm)	Tooth Height (mm)	Number of Teeth	Helix Angle (°)	Weight (g/m)	Heat Transfer Area (m²/m)	Material
7.00	0.25-0.32	0.12-0.18	45-55	15-25	42-50	0.021-0.024	TP2, T2
9.52	0.30-0.40	0.14-0.20	50-65	18-28	52-62	0.025-0.028	TP2, T2
7.94	0.27–0.35	0.12–0.18	45-60	18>28	63–75	0.028–0.032	TP2, T2

Typical Applications

Chemical Heat Exchangers

Heat exchangers handling acids, alkalis, solvents, and corrosive chemical process streams in the chemical and petrochemical industries.

Seawater Coolers and Desalination

Heat exchangers for seawater cooling and desalination plant heaters using 316L, 2205 duplex, or titanium, with chloride resistance.

Food and Dairy Heat Exchangers

Pasteurizers, sterilizers, and processing heat exchangers for milk, juice, beer, and other foods requiring hygienic surfaces.

Pharmaceutical Equipment

Heat exchangers for WFI (Water for Injection), pure steam, and clean utility systems in pharmaceutical manufacturing.

Frequently Asked Questions

Q: Which has better thermal conductivity, stainless steel or copper? Why use stainless steel?

Compared to stainless steel, copper has significantly higher thermal conductivity (~400 W/m·K) (316L is ~15-20 W/m·K). However, stainless steel is chosen for applications where corrosion resistance, cleanliness, or mechanical strength takes priority over thermal performance. In many chemical, pharmaceutical, and food applications, copper is unsuitable due to corrosion or contamination issues. The lower thermal conductivity is often compensated for by using thinner walls, enhanced surfaces (fins/grooves), or increasing flow velocity. Despite the thermal conductivity trade-off, total system cost and reliability in corrosive environments often favor stainless steel.

Q: For seawater cooling, should I choose 304, 316L, or 2205?

For seawater cooling service, we do not recommend 304 because it is prone to chloride pitting and stress corrosion cracking in seawater. 316L has moderate resistance and, with careful design, is suitable for low-temperature seawater applications. For improved reliability and longer service life, especially in warm or polluted seawater, 2205 duplex stainless steel is preferred due to its higher pitting resistance equivalent (PRE) and excellent resistance to chloride stress corrosion cracking. For the most demanding marine environments, super duplex 2507 or titanium is recommended. Please contact our corrosion engineering team for specific material recommendations based on your seawater temperature and chemical composition.

Q: Is the expansion process for stainless steel tubes the same as for copper tubes?

No, expanding stainless steel tubes requires different parameters compared to copper. Stainless steel has higher yield strength and work-hardening characteristics, requiring greater expansion force and careful control of the expansion ratio. Specialized rolling tools with proper lubrication are needed to prevent galling and ensure consistent joint quality. For thick-walled stainless steel tubes or high-pressure applications, hydraulic expansion or explosive expansion may be preferred over mechanical rolling. Kenergy can provide detailed expansion recommendations for each stainless steel grade and wall thickness combination to ensure leak-tight tube-to-tubesheet joints.

Q: Can you provide tubesheets and tube bundle assemblies?

Yes, we offer complete tube bundle manufacturing services, including tubesheet drilling, tube insertion, expansion or welding, and hydrostatic testing. We can provide partial assemblies (tubes cut to length, tubesheets drilled only) or fully assembled bundles ready for installation into the heat exchanger shell. This integrated service ensures consistent quality, shortens your manufacturing lead time, and eliminates the risk of tube-to-tubesheet joint failure. Please share your heat exchanger drawings with our team for a complete quotation.

Stainless steel tubes for industrial heat exchangers