Super Duplex UNS S32750 is the most common super duplex grade in the market.
UNS S32750 is a duplex
stainless steel especially designed for service in aggressive
chloride-containing environments. It has very good resistance to localized
corrosion and stress corrosion cracking in combination with high mechanical
strength. It is widely used in oil & gas, hydropower, pressure vessels,
pulp & paper, structural components and chemical tankers.
APPLICATIONS
The main applications are for
details with special requirements for high corrosion resistance.
UNS S32750 is characterized by:
• High resistance to stress
corrosion cracking in halide containing environments.
• High resistance to pitting and
crevice corrosion.
• High resistance to general
corrosion.
• High mechanical strength.
• High resistance to erosion
corrosion and corrosion fatigue.
Mechanical Properties
|
Tensile strength: |
750 |
N/mm² |
|
Yield strength 0,2% : |
550 |
≥ N/mm² |
|
Elongation: |
25 |
≥ % |
|
Hardness HB30: |
270 |
≤ HB |
Chemical Composition
Carbon C 0,03% max
Silicon Si 0,80% max
Magnese Mn 1,20% max
Phosphorus P 0,035% max
Sulphur S 0,020% max
Chromium Cr 24-26% max
Nickel Ni 6-8% max
Nitrogen N 0,24-0,32% max
Heat Treatment
Solution annealing at 1100°C
followed by water quenching
Corrosion Testing
High resistance to
stress corrosion cracking in halide containing environments.
• High resistance to pitting and crevice corrosion.
• High resistance to general corrosion.
• High mechanical strength.
• High resistance to erosion corrosion and corrosion fatigue.
Welding
Very good
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