Super Duplex 32750 Wst. 1.4410/1.4501 UNS 32750/S32760:-

Specification: ASTM A 789/ASME SA 789/EN ISO 1127 D4/T3
EN 10216-5/NACE MR0175/PED 97/23 EC
Maximum service temperature: 300°C / 572°F

Super duplex is a material having an approximate equal amount of austenitic and ferrite. They are characterized by high Chromium and Molybdenum. These combine excellent corrosion resistance with high strength. Mechanical properties are approximately double those of singular austenitic steel and resistance to crevice corrosion and stress corrosion cracking is superior compared  to the alloys 316L, 317L or duplex 2205 in chloride solutions. As well in ambient and subzero (down to minus 50°C ) is notch ductility good. The super duplex 2507 is the most widely used grade.

Characteristics:

  •     High resistance to chloride pitting and crevice corrosion
  •     Very high mechanical and physical properties  
  •     Good weldability and workability
  •     Low rate of thermal expansions
  •     Good general corrosion resistance 

Market applications:

  •    Chemical and Petrochemical industry
  •    Offshore oil and gas industry
  •    Subsea centralizes
  •    Stream vessels  
  •    Heat exchanges

Technical details

Technical composition (%) Fe Cr Ni Mo Mn Si N C Cu P S
S32750 min Bal. 24 6.0 3.0 1.2 0.80 0.24 0.030 - - -
max - 26 8.0 5.0 1.2 0.80 0.32 0.030 - - -
S32760 min Bal. 24.0 6.0 3.0 1.00 1.00 0.20 0.050 0.50 - -
max - 26.0 8.0 4.0 1.00 1.00 0.30 0.050 1.00 0.035 0.015

Mechanical Properties S32750 S32760
Tensile strenght (mpa, min) 800 750
Yield strength (0.2% offset mpa, min) 550 550
Elongation (%, min) 25 25
Density / weight (g / cm3 / kg) 7.9 7.9

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