S32750 is a superduplex (austeniticferritic) stainless steel for service in highly corrosive
conditions. The grade is characterized by:
· Excellent resistance to stress corrosion cracking (SCC) in chloride-bearing environments
· Excellent resistance to pitting and crevice corrosion
· High resistance to general corrosion
· Very high mechanical strength
· Physical properties that offer design advantages
· High resistance to erosion corrosion and corrosion fatigue
· Good weldability
Standards
UNS: S32750
DIN:1.4410
Pipe standard: ASTM A789, ASTM A790, EN10216-5
Chemical Composition
C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
≤0.030 | ≤1.00 | ≤1.20 | ≤0.035 | ≤0.020 | 24.0-26.0 | 6.0- 8.0 | 3.0- 3.5 | 0.24- 0.32 | ≤0.50 |
Physical properties
Density: 7.8 g/cm3
Thermal expansion1) |
Temperature ℃ | 30-100℃ | 30-200℃ | 30-300℃ |
Per ℃ | 13.5 x 10-6k-1 | 14.0 x 10-6k-1 | 14.0 x 10-6k-1 |
Mechanical properties
Status | Tensile Strength Min.(Mpa) | Yield Strength Min.(Mpa) | Elognation Min. % |
1020-1100℃ Annealed | 800 | 550 | 15 |
Application
SAF 2507 is a duplex stainless steel especially designed for service in aggressive chloride-containing environments. Typical applications are:
Typical applications for Sandvik SAF 2507 |
Oil and gas exploration
and production | Chloride-containing environments such as seawater handling and process systems. Hydraulic and process fluid tubes in umbilicals |
Seawater cooling | Tubing for heat exchangers in refineries, chemical industries, process industries and other industries using seawater or chlorinated seawater as coolant |
Salt evaporation | Evaporator tubing for production of corrosive salts, e.g. chlorides, sulphates and carbonates |
Desalination plants | Pressure vessels for reverse osmosis units, tube and pipe for seawater transport, heat exchanger tubing |
Geothermal wells | Heat exchangers in geothermal exploitation units, systems exposed to geothermal or high salinity brines, tubing and casing for production |
Oil refining and petrochemical and gas processing | Tubes and pipes where the process environment contains a high amount of chlorides, or is contaminated with hydrochloric acid |
Pulp and paper production | Material for chloride-containing bleaching environments |
Chemical processing | Organic acid plants, also when process solutions are contaminated with e.g. chlorides |
Mechanical components requiring high strength | Propeller shafts and other products subjected to high mechanical load in seawater and other chloride-containing environments |
Desulphurisation units | As reheater tubes in flue gas desulphurisation systems. The good mechanical and corrosion properties make Sandvik SAF 2507 an economical choice in many applications by reducing the life cycle cost of equipment.
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