Heat Exchanger Tube Specialist
DLSS supplies high-performance heat exchanger tubes in stainless steel, duplex, nickel alloy, titanium and copper nickel materials for condensers, evaporators, heaters and industrial heat transfer equipment.
- Straight Tubes
- U-Bend Tubes
- Finned Tubes
- Long Length Tubes
Multiple Materials
Stainless · Duplex · Nickel Alloy · Titanium · Copper Nickel
Custom Tube Requirements
OD · WT · Length · Minimum Wall · Surface
U-Bending & Finned Tubes
Straight · U-Bend · Long Length · Enhanced Surface
Inspection Support
ET · UT · PMI · Hydro · EN 10204 3.1 / 3.2
Heat Exchanger Tube Solutions by Material
Material selection depends on process fluid, corrosion environment, temperature, pressure and project specification.
Stainless Steel Heat Exchanger Tubes
304L · 316L · 321 · 347H · 904L For chemical, refinery, power and general heat-transfer service.
Duplex Heat Exchanger Tubes
S31803 · S32205 For chloride-containing and corrosive process environments.
Super Duplex Heat Exchanger Tubes
S32750 · S32760 For severe chloride, seawater and corrosion-critical service.
Nickel Alloy Heat Exchanger Tubes
400 · 600 · 625 · 800/800H · 825 · C22 · C276 For high-temperature and aggressive chemical environments.
Titanium Heat Exchanger Tubes
Grade 2 · Grade 7 · Grade 12 For seawater, condensers, desalination and chloride service.
Copper Nickel Condenser Tubes
C70600 · C71500 For condensers, seawater cooling and heat-transfer systems.
Brass Condenser Tubes
C68700 · C44300 For condensers, evaporators and cooling-water service.
Carbon & Alloy Steel Heat Transfer Tubes
ASTM A179 · A213 T-Series For heat exchangers, condensers and elevated-temperature service.
Heat Exchanger Tube Forms
Different exchanger designs require different tube configurations.
Straight Heat Exchanger Tubes
Straight seamless or welded tubes, where permitted by the applicable specification, for shell & tube heat exchanger and condenser designs.
U-Bend Heat Exchanger Tubes
Precision U-bend tubes with customized straight-leg length, bend radius and project-specific inspection requirements.
Long Length Heat Exchanger Tubes
Customized long-length tubes for large exchanger bundles requiring specific project lengths and fewer joints.
Finned Heat Exchanger Tubes
Low-fin and integral enhanced tube solutions designed to increase heat-transfer surface area.
Built for Demanding Heat Exchanger Projects
From non-standard dimensions to U-bending, finning and inspection, DLSS supports complex tube requirements beyond standard stock supply.
5000+
Tons Stock
40+
Years Experience
40m+
Long Length Capability
EN10204
3.1 / 3.2 Support
Materials
SS / Duplex / Ni / Ti / CuNi
Global
Delivery
Industries We Serve
Heat Exchanger Manufacturers
OEM tube supply for shell and tube heat exchanger production.
Power Generation
Condenser, boiler and cooling system tube applications.
Oil & Gas
Tube solutions for refinery and petrochemical heat transfer equipment.
Chemical Processing
Corrosion-resistant tubes for demanding process conditions.
Desalination & Seawater
Titanium, duplex and copper nickel solutions for seawater environments.
Industrial Cooling
Reliable tube solutions for industrial heat transfer systems.
Tube Forms & Manufacturing Capability
From standard tubes to customized solutions, DLSS supports various heat exchanger tube requirements with reliable processing and inspection capabilities.
Custom Sizes
Special OD / WT / Length
Long Length Tubes
Large exchanger projects
U-Bending
Precision U-tube processing
Finned Tubes
Enhanced heat transfer
Heat Treatment
Solution annealing support
Inspection
HT / ET / UT / DPT / PMI
3.1 / 3.2 Support
Complete documentation
Professional Packing
Global shipment solutions
Strict Quality Control for Every Heat Exchanger Tube
Every stainless steel tube is inspected to ensure reliability, performance and full traceability.
Material & Dimensional Inspection
PMI and spectrometer testing ensure correct material grade and dimensional accuracy.
Ring Gauge Inspection
Ensures dimensional accuracy and proper tube fitting.
Hydrostatic Pressure Testing
Verifies strength and leak-proof performance under pressure.
Penetrant Testing (PT)
Detects surface cracks and defects effectively.
Borescope Inspection
Ensures internal surface quality and detects inner defects.
Visual Inspection
Checks external surface quality and appearance.
Inspection requirements are reviewed according to the applicable material standard, purchase specification and project ITP.
Our Sustainability Efforts for the Next Generation
ISO 14001 Environmental Management
Wastewater Treatment Process
Energy-Efficient Heat Treatment Equipment
Material Recycling and Waste Control
Heat Exchanger Tube Project Experience
Real tube requirements. Real inspection. Real project delivery.
Duplex Heat Exchanger Tube Project
Material:S32205Standard:ASTM A789Application:Chemical Heat Exchanger
Copper Nickel Condenser Project
Material:C70600Standard:ASTM B111Application:Power Plant Condenser
Titanium Tube Project
Material:Titanium Grade 2Standard:ASTM B338Application:Desalination
Heat Exchanger Tube Technical Center
Material data, tube standards and engineering guidance for specification and project decisions.
Material Guides
S32205 · S32750 · Alloy 625 · Titanium Gr.2 · C70600
Tube Standards
ASTM A179 · A213 · A249 · A789 · B111 · B338
Engineering Guides
Minimum WT · OD Tolerance · U-Bend Ovality · Grain Size
Inspection Guides
ET · UT · PMI · Hydro · 3.1 vs 3.2
Tube Selection Guides
Stainless vs Duplex · S32205 vs S32750 · Titanium vs Super Duplex
Blogs
Titanium vs Stainless
Titanium tubes and stainless steel tubes are both used as heat exchanger tubes in many industrial systems. But they are not used for the same working conditions. Titanium is often used in seawater, high chloride, desalination, and marine systems. Stainless steel is often used in general heat exchangers, boilers, power plants, chemical plants, and cost-sensitive […]
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TP904L Stainless Pipes
Introduction Japan’s seawater desalination plants operate in highly corrosive environments due to the presence of chlorides and high salinity. TP904L stainless pipes from DLSS offer superior resistance to pitting and crevice corrosion, making them an ideal choice for JIS G3459 – Stainless Steel Pipes for Corrosion Resistance compliance in marine applications. 1. Why TP904L for […]
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Precision Delivered: Super
At DLSS (Zhejiang Daling Special Steel Co., Ltd.), we take pride in transforming customer requirements into high-performance stainless steel solutions. Recently, we successfully fulfilled a custom order for Super Duplex Stainless Steel (UNS S32750) Tie Rods and Hex Nuts, tailored precisely to our client’s technical drawings and application needs. Project Overview Strict Quality Requirements Met […]
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ASTM A789 S32750
Meta Description: Explore how ASTM A789 S32750 Super Duplex stainless steel tubes are used in seawater condensers, offering unmatched resistance to corrosion, pitting, and stress cracking in marine environments. Introduction Seawater condenser systems operate in highly aggressive environments, constantly exposed to chloride ions and variable temperatures. Standard stainless steels like 304 or 316 often fail […]
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