Duplex Heat Exchanger Tubes
Duplex stainless steel tubes combine high mechanical strength with resistance to chloride-related corrosion for selected heat exchanger and condenser applications.
DLSS reviews S31803 and S32205 requirements against the process conditions, tube dimensions, product standard, heat treatment and inspection specification.
- S31803 & S32205 Duplex Grades — Project-specific material requirements
- ASTM A789 / ASME SA789 — Seamless and welded duplex stainless steel tubing
- Testing & Inspection — PMI · ET · UT · Hydro · EN 10204 3.1 / 3.2
Duplex Material Range
S31803 · S32205
Wall Requirements
Average WT · Minimum WT
U-Bend Available
Custom straight-leg length & bend radius
Inspection Support
PMI · ET · UT · Hydro · 3.1 / 3.2
Duplex Tubes for Demanding Heat Exchanger Service
Duplex stainless steel tubes combine high mechanical strength with resistance to chloride-related corrosion for selected heat exchanger and condenser applications.
DLSS reviews S31803 and S32205 requirements against the process conditions, tube dimensions, product standard, heat treatment and inspection specification.
Selection Factors: Process Fluid · Temperature · Chlorides · Pressure · Inspection Requirements
High Strength
Suitable for demanding pressure and structural requirements.
Chloride Resistance
Duplex material options for chloride-containing service.
Custom Tube Forms
Straight, U-bend and long-length configurations.
Inspection Control
PMI, NDE and project documentation support.
Duplex Grades We Supply
Select the grade according to process conditions, corrosion requirements and project specification.
UNS S31803
S31803 Duplex Stainless Steel
Duplex stainless steel grade for heat exchanger applications requiring increased strength and improved corrosion performance compared with conventional austenitic stainless steels.
Typical Applications
Chemical Processing · Process Heat Exchangers · Oil & Gas · Industrial Cooling
UNS S32205
S32205 Duplex Stainless Steel
Widely specified duplex stainless steel for demanding heat exchanger service requiring a combination of mechanical strength and corrosion resistance.
Typical Applications
Chemical Processing · Chloride-Containing Service · Oil & Gas · Heat Exchangers
Available Duplex Tube Forms
Different heat exchanger designs require different tube configurations.
Straight Tubes
Seamless or welded duplex tubes supplied to the specified dimensions and product standard.
U-Bend Tubes
Drawing-based U-bends with specified radius, leg length and inspection requirements.
Long Length Tubes
Custom lengths confirmed by grade, dimensions, manufacturing route and transport requirements.
Finned Tubes
Duplex finned tube requirements reviewed by fin construction, geometry and finished-wall specification.
Duplex Heat Exchanger Tube Specifications
| Specification | Available Options |
|---|---|
| Grades | S31803 / S32205 |
| Construction | Seamless / Welded |
| OD & Wall Basis | Standard / Custom OD · Average / Minimum WT |
| Length | Fixed / Random / Custom Long Length |
| Tube Form | Straight / U-Bend / Finned |
| Surface & Heat Treatment | Per material / project specification |
| Inspection | PMI / ET / UT / Hydro / Dimensional / TPI |
| Documentation | MTC / EN 10204 3.1 / 3.2 / Reports |
Common Duplex Tube Standards
ASTM A789 / ASME SA789
Seamless and welded duplex stainless steel tubing.
EN 10216-5
Seamless stainless steel tubes for pressure purposes.
ASTM A790 / ASME SA790
Related specification for duplex stainless steel pipe.
Duplex Heat Exchanger Tube Applications
Heat Exchanger Manufacturers
Duplex tube supply for heat exchanger fabrication, replacement bundles and demanding process equipment.
Refineries
Duplex tube materials for refinery heat-transfer equipment requiring increased strength and corrosion resistance.
Oil, Gas & Petrochemical
Tube solutions for process heat exchangers handling corrosive operating conditions.
Chemical Processing
Duplex heat exchanger tubes for aggressive process media and chemical equipment.
Desalination & Seawater
Duplex material options for selected heat exchanger applications involving chloride-rich service conditions.
Testing, Inspection & Documentation
Dimensional Inspection
OD · WT · Length · Straightness
Nondestructive Testing
ET / UT where applicable
PMI / Alloy Verification
Material identification
Pressure Testing
According to specification
Heat Treatment Records
Grade-specific requirements
Third-Party Inspection
According to the agreed ITP
Project Documentation Support
- EN 10204 3.1 / 3.2 Certificates
- MTC (Mill Test Certificate)
- PMI Report
- ET / UT Reports
- Dimensional Reports
- Packing List & More
Complete documentation for seamless approvals and traceability.
Why DLSS for Duplex Heat Exchanger Tubes?
Duplex Material Expertise
S31803 · S32205
Custom Sizes & Wall Basis
OD · WT · Length · Minimum Wall
U-Bending & Finning
Drawing-based processing review
Inspection & Traceability
Material · Heat Treatment · Test Records
Urgent Project Review
Availability · Inspection · Delivery
FAQ
What duplex grades does DLSS supply for heat exchanger tubes?
What standard is commonly used for duplex stainless steel tubing?
Can duplex tubes be supplied with minimum-wall requirements?
Can duplex tubes be supplied as U-bend tubes?
What inspections can be arranged?
Duplex Heat Exchanger Tube Technical Resources
S32205 Material Guide
Composition, properties, corrosion characteristics and heat exchanger applications.
ASTM A789 Tube Standard
Scope, tube manufacturing, wall requirements, heat treatment and inspection.
Stainless Steel vs Duplex
Compare conventional austenitic stainless steel and duplex materials for heat exchanger applications.
S32205 vs S32750
Understand when Duplex 2205 or Super Duplex 2507 may be considered.
PREN Explained
Understand how alloy chemistry relates to pitting resistance.