SAF2507 is Alleima's designation for the super duplex stainless steel UNS S32750. SAF stands for Alleima Austenite Ferrite, and 2507 references the UNS S32750 caption. Its composition and production are optimised to maximise mechanical properties and corrosion resistance.
Like other super duplex stainless steels such as Ferralium® 255 and Zeron 100®, SAF2507 is based on a 25% chromium content. With a pitting resistance equivalent number (PREN) above 40 its corrosion resistance is extremely good, and super duplex grades are recommended for applications requiring long-term immersion in seawater. Yield strength is typically 3-4x that of a regular Alloy 316L grade.
We stock a complete range of SAF2507 from 20mm to 450mm diameter solid bar.
Applications for super duplex stainless steel
SAF2507 is designed specifically for service in aggressive chloride-containing environments. Typical applications include:
- Oil and gas exploration and production - chloride-containing environments such as seawater handling and process systems, plus hydraulic and process-fluid tubes in umbilicals
- Seawater cooling - heat exchanger tubing in chemical and process industries and refineries using seawater or chlorinated seawater as coolant
- Salt evaporation - evaporator tubing for the production of corrosive salts
- Desalination plants - pressure vessels for reverse osmosis units, tube and pipe for seawater transport, and heat exchanger tubing
- Geothermal wells - heat exchangers in geothermal exploitation units, systems exposed to geothermal or high-salinity brines, and tubing and casing for production
- Oil refining, petrochemical and gas processing - tubes and pipes where the process environment contains large amounts of chlorides or is contaminated with hydrochloric acid
- Pulp and paper production - material for chloride-containing bleaching environments
- Mechanical components requiring high strength - propeller shafts and other products subjected to high mechanical load in seawater and other chloride-containing environments
- Chemical processing - organic acid plants and process solutions contaminated with chlorides
- Desulfurization units - reheater tubes in flue gas desulfurization systems