ASME SA789 UNS S32750 / SAF 2507 / 1.4410 Super Duplex Steel Tube Heat Exchanger Tube
ASTM A789 UNS S32750 / Super Duplex 2507 Super Duplex Stainless Steel Heat Exchanger Tube
ASME SA789 UNS S32750 / SAF 2507 super duplex stainless steel seamless tubing. A seamless tube that forms the boundary between two fluid streams in a shell‑and‑tube heat exchanger. The material – super duplex UNS S32750 – is selected when the shellside or tubeside fluid contains high levels of chlorides (e.g., seawater, brine, produced water) or hydrogen sulfide (sour service). Its high strength allows it to withstand thermal cycling and pressure pulsations, while its corrosion resistance prevents the tube wall from thinning, pitting, or cracking – the three leading causes of heat exchanger tube failure. Typical applications: offshore platform coolers, desalination brine heaters, and FGD reheater tubes.
ASME SA789 UNS S32750 Super Duplex Stainless Steel Heat Exchanger Tube Equivalent Grade
|
Duplex |
UNS Designation |
Werkstoff NR. |
Specifications |
AFNOR |
Grade |
1.4410 |
|---|---|---|---|---|---|---|
|
SAF2507 |
S32750 |
1.4410 |
A/SA789, A/SA790 |
Z3 CN 25.06 Az |
F53 |
X2 Cr Ni MoN 25.7.4 |
ASME SA789 UNS S32750 Super Duplex Stainless Steel Heat Exchanger Tube Chemical Composition
| C% | Si% | Mn% | P% | S% | Cr% | Ni% | Mo% | N% | Cu% |
| 0.03 max | 0.8 max | 1.2 max | 0.035 max | 0.02 max | 24-26 | 6-8 | 3-5 | 0.24-0.32 | 0.5 max |
ASME SA789 UNS S32750 Super Duplex Stainless Steel Heat Exchanger Tube Mechanical Properties
| Tensile Strength, Mpa | Yield Strength, MPa | Elongation, % | Hardness, HB |
| 795 min | 550 min | 15 min | 310 max |
Comparison with Alternatives for Heat Exchanger Tubes
| Grade | PREN | Max Temp in Chlorides | Relative Cost | Best Use Case |
| 316L | 24 | 40℃ | 1x | Clean water, low chlorides |
| 2205 (Duplex) | 35 | 80℃ | 2x | Moderate chlorides, some H₂S |
| SAF 2507 (S32750) | 42 | 150℃ | 4-5x | Seawater, high chlorides, sour service |
| Alloy 625 (Ni-base) | 50+ | 200℃ | 10x+ | Extreme: HCl, HF, very high temp |
Application
- Offshore Oil & Gas
- Desalination- Brine heaters, multi-stage flash (MSF) condensers.
- Chemical Processing
- Pulp & Paper
- Flue Gas Desulfurization (FGD)
- Geothermal
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