Super Duplex Heat Exchanger Tubes
High-performance S32750 and S32760 super duplex tubes for heat exchangers operating in severe chloride-containing and highly corrosive environments.
Available in UNS S32750 and S32760, with straight, U-bend and customized long-length configurations according to project requirements.
- S32750 & S32760 — Super Duplex Material Options
- ASTM A789 / ASME SA789 — Duplex Stainless Steel Tubing
- Inspection Support — PMI · ET · UT · Hydro · EN 10204
Super Duplex Grades
S32750 · S32760
Wall Requirements
Average WT · Minimum WT
U-Bend Capability
Custom Straight-Leg Length & Bend Radius
Inspection Support
PMI · ET · UT · Hydro · 3.1 / 3.2
Super Duplex Tubes for Severe Corrosion Service
Super duplex stainless steel heat exchanger tubes combine high alloy content, very high mechanical strength and strong resistance to localized corrosion for demanding heat-transfer applications.
They are commonly considered where operating conditions involve high chloride exposure, seawater or aggressive process media and where conventional stainless steel or standard duplex grades may not provide sufficient corrosion performance.
Material selection should consider:
Process fluid chemistry · Chloride concentration · Operating temperature · Design pressure · Pitting and crevice corrosion risk · Stress corrosion cracking risk · Required mechanical strength · Applicable material standard · Heat treatment · Inspection requirements
S32750/1.4410 is specifically documented for aggressive chloride-containing conditions, including seawater cooling, desalination, refineries and petrochemical applications. S32760/1.4501 is likewise positioned by manufacturers for highly corrosive service and applications including desalination, seawater systems and heat exchangers.
Severe Corrosion Resistance
For demanding chloride-containing environments.
Very High Strength
Super duplex materials provide high mechanical strength.
Heat Exchanger Applications
Suitable for selected seawater, chemical and process duties.
Inspection Control
PMI, NDE and traceability support.
Super Duplex Grades We Supply
Select the grade according to process chemistry, corrosion severity and project specification.
UNS S32750
S32750 Super Duplex Stainless Steel
High-alloy super duplex stainless steel offering strong resistance to chloride stress corrosion cracking, pitting and crevice corrosion together with very high mechanical strength.
Typical Applications
Desalination · Seawater Cooling · Chemical Processing · Refineries · Petrochemical Heat Exchangers
UNS S32760
S32760 Super Duplex Stainless Steel
High-alloy austenitic-ferritic stainless steel designed for highly corrosive service. S32760 corresponds to EN 1.4501 and includes controlled Cu and W additions in addition to Cr, Ni, Mo and N.
Typical Applications
Desalination · Chemical Processing · Seawater Systems · Heat Exchangers · Severe Corrosion Service
Available Super Duplex Tube Forms
Different heat exchanger designs require different tube configurations.
Straight Super Duplex Tubes
Straight seamless or welded tubes, where permitted by the applicable specification, for heat exchanger and condenser applications.
Super Duplex U-Bend Tubes
Precision U-bend tubes with project-specific geometry and inspection requirements.
Parameters We Can Review
OD · WT · Straight-Leg Length · Bend Radius · Wall Thinning · Ovality
Long Length Super Duplex Tubes
Customized long-length tubes for exchanger bundles requiring project-specific tube lengths and fewer joints.
Available length depends on grade, OD, wall thickness, manufacturing route and transportation requirements.
Super Duplex Finned Tubes
Enhanced-surface super duplex tube solutions can be reviewed for project-specific heat-transfer applications according to base tube specification, fin geometry and inspection requirements.
Super Duplex Heat Exchanger Tube Specifications
| Specification | Available Options |
|---|---|
| Material Grades | S32750 / S32760 |
| Construction | Seamless / Welded where applicable |
| Outside Diameter | Standard & Customized |
| Wall Thickness | Average WT / Minimum WT |
| Length | Fixed / Random / Customized Long Length |
| Tube Form | Straight / U-Bend / Finned |
| Surface | Annealed / Pickled / Project Requirement |
| Heat Treatment | According to applicable material specification |
| Inspection | PMI / ET / UT / Hydro / Dimensional / TPI |
| Documentation | MTC / EN 10204 3.1 / 3.2 / Inspection Reports |
Common Super Duplex Tube Standards
ASTM A789 / ASME SA789
ASTM A789/A789M-24 is the active ASTM specification for seamless and welded ferritic/austenitic stainless steel tubing. It covers average-wall tubing and also minimum-wall tubing when specified on the order; tubes are furnished heat treated and are subject to specified mechanical and NDE/hydrostatic requirements.
EN 10216-5
Seamless stainless steel tubes for pressure purposes. S32750 tube/pipe supplier data lists EN 10216-5 as an applicable seamless tube/pipe product standard.
ASTM A790 / ASME SA790
ASTM A790/A790M-24 covers seamless and welded ferritic/austenitic stainless steel pipe, so it should remain secondary on this heat-exchanger tubing page.
Super Duplex Heat Exchanger Tube Applications
Heat Exchanger Manufacturers
Tube supply for exchangers requiring high mechanical strength and enhanced corrosion resistance.
Refineries
Super duplex tube solutions for selected corrosive refinery heat-transfer applications.
Oil, Gas & Petrochemical
High-performance tube materials for demanding process and petrochemical heat exchangers.
Chemical Processing
Tube materials for aggressive process media requiring enhanced localized corrosion resistance.
Desalination & Seawater
Super duplex materials for selected heat exchanger and cooling duties in chloride-rich environments.
Testing, Inspection & Documentation
ET
Eddy Current Testing
UT
Ultrasonic Testing
PMI
Positive Material Identification
Hydro
Hydrostatic Testing
Dimensional Inspection
OD / WT / Length
Documentation
Reports & Certificates EN 10204 3.1 / 3.2
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 Super Duplex Heat Exchanger Tubes?
Super Duplex Material Expertise
Project support for S32750 and S32760 tube requirements.
Minimum-Wall & Custom Requirements
Average-wall, minimum-wall and non-standard dimensional requirements can be reviewed according to project specifications.
U-Bending & Finned Tube Capability
Customized U-bend and enhanced-surface tube configurations can be reviewed according to drawings and inspection requirements.
Heat Treatment & Traceability
Project control covering material identification, heat treatment documentation and inspection traceability.
Urgent Project Support
Material availability, production route and inspection requirements can be reviewed for replacement and shutdown projects.
FAQ
What super duplex grades does DLSS supply?
What is the main difference between S32750 and S32760?
What standard is commonly used for super duplex tubing?
Can super duplex tubes be supplied with minimum-wall requirements?
Can super duplex tubes be supplied as U-bend tubes?
What inspections can be arranged?
Super Duplex Heat Exchanger Tube Technical Resources
S32750 Material Guide
Material properties, corrosion characteristics and heat exchanger applications.
S32760 Material Guide
Material characteristics, composition and demanding service applications.
ASTM A789 Tube Standard
Average/minimum wall, heat treatment, testing and inspection requirements.
S32205 vs S32750
Understand when standard duplex or super duplex may be considered.
S32750 vs S32760
Compare the two major super duplex grades.