Alloy 2507 Super Duplex Tubing
Alloy 2507 Super Duplex Tubing
2507 Super Duplex is a high alloy duplex stainless steel with a PRE (pitting resistance equivalent) value of 42.5 minimum. The grade is characterized by very good chloride corrosion resistance, combined with very high mechanical strength. It is particularly suited for use in aggressive environments such as warm chlorinated seawater and acidic chloride-containing media. It is widely used in offshore oil and gas exploration/production and in heat exchangers in petrochemical/chemical processing. The grade is also suitable for hydraulic and instrumentation applications in tropical marine environments.
Product Specifications
ASTM A-789
Size Range
Outside Diameter (OD) | Wall Thickness |
.250"–1.000" | .035″–.134″ |
All Pressure Ratings are approximate and for illustration purposes only. Values are not guaranteed or warranted.
Chemical Requirements
Super Duplex 2507 (UNS S32750)
Composition %
C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu |
0.030 max | 1.20 max | 0.035 max | 0.020 max | 0.80 max | 6.0–8.0 | 24.0–26.0 | 3.0–5.0 | 0.24–0.32 | 0.50 max |
Chemical Requirements
Super Duplex 2507 (UNS S32750)
Composition %
C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu |
0.030 max | 1.20 max | 0.035 max | 0.020 max | 0.80 max | 6.0–8.0 | 24.0–26.0 | 3.0–5.0 | 0.24–0.32 | 0.50 max |
Dimensional Tolerances
OD | OD Tolerance | Wall Tolerance |
≤ .500” | ± .005” | ± 15% |
0.500”–1.500” excl | ± .005” | ± 10% |
Mechanical Properties
Yield Strength: | 80 ksi min |
Tensile Strength | 116 ksi min |
Elongation (min 2”) | 15% |
Hardness (Rockwell C Scale) | 32 HRC max |
Industry Applications
Chemical Process
Super Duplex 2507 is designed for demanding applications which require exceptional strength and corrosion resistance, which are found in chemical process, petrochemical, and seawater equipment. The alloy is used in salt evaporation processes, heat exchangers, and hydrochloric acid environments.
Marine
Ocean transportation spends the vast majority of its time in the sea where 2507 performs brilliantly against seawater hardness. Ships require the corrosion resistance of Super Duplex 2507 to stay continually moving and on time. Marine applications include tubing for desalination plants and ship propulsion systems.
Oil & Gas
Super Duplex 2507 is known for its superior performance, strength, and resistance to corrosion, which makes it a perfect choice for offshore oil and gas exploration and production applications.
Power Generation
The mechanical and corrosion properties of Super Duplex 2507 make it an economical choice for reheater tubes in flue gas desulphurisation units. See power generation for more information.
Pulp & Paper
With excellent resistance to chloride pitting and crevice corrosion attack , Super Duplex 2507 is used in chloride-containing bleaching environments and oxygen delignification. See pulp and paper for more information.
Renewable Energy
The properties of alloy 2507, including strength, good ductility and excellent corrosion resistance, make it an ideal solution for geothermal well heat exchangers and production tubing. See renewable energy for more information.
