Seamless Stainless Steel Tubes Supplier
For Heat Exchangers, Boilers, Condensers, Offshore, Petrochemical & Industrial Applications
Why Global Buyers Choose DLSS Stainless Steel Tubes
DLSS supplies precision seamless stainless steel tubes for heat exchangers, boilers, condensers, offshore, petrochemical and industrial systems worldwide.
We focus on stable dimensions, clean inner surfaces, strict testing and reliable delivery — helping customers reduce installation risk and improve project efficiency.
Whether for standard ASTM tubes or customized special alloy solutions, we provide complete support from quotation to final shipment.
Key Advantages:
✓ Precise OD & WT Tolerance
✓ 100% PMI + ET + UT + Hydro Test
✓ EN10204 3.1 / 3.2 Certification
✓ Bright Annealed / Pickled Surface Available
✓ Fast Delivery for Urgent Projects
✓ U Bend / Cut Length / Custom Marking Support
Product Specification Table
| Item | Specification |
|---|---|
| Product Name | Seamless Stainless Steel Tubes |
| Standards | ASTM A213 / ASTM A269 / ASTM A312 / EN 10216-5 |
| Material Grades | 304 / 304L / 316 / 316L / 321 / 310S / 904L / Duplex 2205 / Super Duplex 2507 / Nickel Alloy |
| Outer Diameter (OD) | 6mm – 830mm |
| Wall Thickness (WT) | 0.5mm – 48mm |
| Length | Max 18,000mm |
| Surface Finish | BA / AP / Pickling / Polished |
| End Type | Plain End / Beveled End |
| Tolerance | Strict OD & WT Precision Control |
| Testing | PMI / ET / UT / PT / Hydro Test / Air Under Water Test |
| Heat Treatment | Solution Annealed / Bright Annealed |
| Certification | EN10204 3.1 / 3.2 / PED / BV / ABS / DNV / LR |
| Application | Heat Exchanger / Boiler / Condenser / Offshore / Petrochemical |
| MOQ | 1 Piece |
| Delivery Time | Fastest 7–35 Days |
| Packing | Wooden Cases / Iron Frame / Export Seaworthy Packing |
Main Applications of Seamless Stainless Steel Tubes
Designed For High Temperature, High Pressure And Corrosion Resistant Industrial Systems
Heat Exchanger Systems
Used for shell & tube heat exchangers, condensers, evaporators and reboilers.
Especially suitable for high-pressure and high-temperature fluid transfer systems requiring long-term reliability and corrosion resistance. Shell-and-tube heat exchangers are commonly used in oil refineries and large chemical processes and are suited for higher-pressure applications .
Key Benefits:
✓ Precise OD & WT tolerance
✓ Clean inner surface for better heat transfer
✓ Long service life
✓ Excellent corrosion resistance
Boiler & Condenser Projects
Widely used in boiler tubes, superheaters, reheaters and steam condensers.
Designed for stable performance under thermal cycling and pressure fluctuations. Stainless steel condenser tubes are commonly used in heat exchangers, condensers, and cooling systems designed for high temperatures and corrosive environments .
Key Benefits:
✓ High pressure resistance
✓ Stable performance at high temperature
✓ Anti-scaling surface
✓ Reliable long-term operation
Petrochemical & Refinery Plants
Applied in refineries, gas processing units, chemical plants and pressure vessels.
Suitable for aggressive media, acid environments and chloride corrosion conditions. Common uses include crude oil preheaters, refinery processes, gas cooling exchangers and fractionation systems .
Key Benefits:
✓ Strong acid corrosion resistance
✓ Suitable for chloride environments
✓ Full project certification support
✓ Long maintenance cycle
Offshore & Desalination Systems
Used for offshore platforms, seawater cooling systems and desalination plants.
Duplex stainless steel, nickel alloy and CuNi tubes are commonly selected for seawater and marine environments because of corrosion resistance and durability .
Key Benefits:
✓ Seawater corrosion resistance
✓ Chloride pitting resistance
✓ Strong anti-fouling performance
✓ Ideal for marine environments
Global Seamless Tube Supply Projects
Proven Performance In Heat Exchanger, Boiler, Petrochemical And Offshore Projects Worldwide
Heat Exchanger Tubes For Petrochemical Project
Material:
ASTM A213 TP316L
Size:
19.05 × 2.11 mm
Application:
Shell & Tube Heat Exchanger
Project Highlights
✓ 100% PMI + Hydro Test
✓ Third-party inspection approved
✓ Delivered within 35 days
✓ Stable performance under high pressure
Stainless steel heat exchanger tubes are widely used in petrochemical applications where corrosion resistance and thermal performance are critical
CuNi Tubes For Seawater Cooling System
Material:
ASTM B111 C70600
Size:
16 × 1.0 mm
Application:
Marine Condenser
Project Highlights
✓ Excellent seawater corrosion resistance
✓ Tight OD tolerance for tube sheet fitting
✓ Long-term stable offshore operation
✓ Strong export packing protection
Copper nickel tubes are commonly selected for marine condensers and seawater systems because of corrosion resistance and durability
U Bend Tubes For Power Plant Condenser
Material:
ASME SA213 TP304
Size:
19.05 × 2.0 mm
Application:
Power Plant Condenser
Project Highlights
✓ Precise U bend radius control
✓ No cracking after bending
✓ PT + Hydro Test completed
✓ Ready for direct installation
Boiler and condenser systems require stable high-temperature performance and reliable dimensional control
Duplex Tubes For Offshore Platform Project
Material:
Duplex 2205
Size:
25.4 × 1.65 mm
Application:
Offshore Heat Exchanger
Project Highlights
✓ Chloride corrosion resistance
✓ Offshore certification support
✓ Full MTC + EN10204 3.1
✓ Long maintenance cycle
Duplex stainless steel is widely used in offshore and desalination systems because of seawater and chloride resistance
Customized Tube Supply Solutions For Your Business
Flexible Support For Heat Exchanger Manufacturers, Stockists And Project Buyers
For Stockists
Flexible supply plans and stable pricing strategy to support your local inventory business.
What We Support
✓ Flexible MOQ from small trial orders
✓ Wide size and grade availability
✓ Stable supply for repeat orders
✓ Regional market pricing protection
✓ Fast replenishment for urgent stock needs
For Heat Exchanger Manufacturers
Stable tube quality, precise tolerance and reliable delivery for your production schedule.
What We Support
✓ Tight OD & WT tolerance for tube sheet fitting
✓ U Bend / Cut Length / Custom Radius
✓ Fast response for urgent RFQs
✓ Full inspection reports before shipment
✓ EN10204 3.1 / 3.2 certification support
Heat exchanger manufacturers rely on dimensional precision and inspection traceability to reduce installation risk.
For EPC Contractors & Project Buyers
Fast quotation, technical confirmation and delivery reliability for critical project deadlines.
What We Support
✓ Priority production for shutdown projects
✓ Third-party inspection arrangement
✓ Full export documentation support
✓ Special packing for long-distance shipment
✓ Real-time production updates
For project buyers, delivery reliability and certification are often more critical than lowest price.
Fast Delivery
Production as fast as 7–35 days depending on order
Competitive Pricing
Factory-direct sourcing for better margins
Strict Quality Control
100% inspection & traceability
Quick RFQ Response
Fast quotation within 24 hours
Regional Pricing Protection
Avoid market conflicts and price competition
Custom Logo & Marking
Support small batch customization
Flexible MOQ
Adaptable order quantities for different needs
One-Stop Marketing Support
Photos, videos and documents for your promotion
Upgraded Packaging
Safe transport for long-distance shipment
We do not simply supply tubes —
we help customers reduce risks, protect project schedules and solve real procurement problems.
FAQ
Common Questions About Seamless Stainless Steel Tubes
Seamless tubes are produced without any welding seam, offering higher pressure resistance, better corrosion performance and stronger structural reliability.
They are widely used in heat exchangers, boilers, condensers, offshore and high-pressure industrial systems where safety and long service life are critical. ASTM A213 is specifically intended for seamless boiler, superheater and heat-exchanger tubes used under high temperature and pressure service
The most common standards include:
ASTM A213
ASTM A269
ASTM A312
EN 10216-5
ASME SA213
These standards are widely used for heat exchangers, boilers, condensers and pressure systems. ASTM A269 is commonly used for seamless and welded austenitic stainless steel tubing for general service
We supply:
304 / 304L
316 / 316L
321
310S
904L
Duplex 2205
Super Duplex 2507
Nickel Alloy Tubes
Titanium Tubes
Copper Nickel Tubes
Material selection depends on corrosion conditions, temperature and project requirements.
Duplex 2205 is commonly selected for high chloride, marine, oil & gas and chemical processing environments because of its strong corrosion resistance
Yes.
We provide:
EN10204 3.1 Certificate
EN10204 3.2 Certificate
PED
BV
ABS
DNV
LR
SGS / TUV inspection support
Full traceability and project certification are available.
Every tube can be inspected by:
PMI
Hydro Test
Eddy Current Test (ET)
Ultrasonic Test (UT)
Penetrant Test (PT)
Air Under Water Test
Borescope Inspection
Dimensional Inspection
Surface Inspection
This ensures reliable quality before shipment.
Yes.
We support:
Custom OD & WT
Special lengths
Small MOQ orders
U Bend Tubes
Low Fin Tubes
Finned Tubes
Special project customization
OEM logo marking is also available.
Standard production time:
7–35 Days
depending on size, quantity and material grade.
For urgent shutdown projects, fast delivery support is available.
We use:
Strong wooden cases
Iron frame packing
Seaworthy export packing
Anti-rust protection
Moisture-proof wrapping
Special packing for long-distance sea shipment
This ensures tubes arrive safely without damage.
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