Super Duplex UNS S32750: Composition and Properties

Super Duplex UNS S32750 Data Sheet

UNS S32750 Super Duplex, also know by its trade name SAF2507 has a microstructure 50% austenite and 50% ferrite.  The material exhibits high mechanical strength with outstanding corrosion resistance in marine environments.  32760 typically as a min PREN of 40.  Due to these features the material is regularly used in place of the 300 stainless series, 22% Cr Duplex and precipitation hardening grades such as 17-4PH.

 Common Applications of UNS S32750

Seawater Filter

Waste water/Desalination

Chemical Plants

Oil & Gas

  UNS S32750 Chemical Composition

C (Carbon)                      0.03%  Max

Cr (Chromium)               24.0-26.0%

Fe (Iron)                           Balance

Mn (Manganese)             2.0% Max

Mo (Molybdenum)          3.0-4.5%

Ni (Nickel)                        6.0-8.0%

N (Nitrogen)                     0.24-0.35%

P (Phosporous)                0.035% Max

Si (Silicon)                        1.0% Max

S (Sulphur)                      0.015% Max

  UNS S32750 Physical Properties

 Density            7800kg/m3

  UNS S32750 Mechanical Properties

 Hardness  Brinell                           290 Max

Tensile Strength @ Break               930Mpa  / 135000psi        

Tensile Strength @ Yield                530Mpa / 77000 psi    0.2% offset

Elongation @ Yield                        25%

Modulus of Elasticity                      200Gpa          29000 ksi

*Above properties typical values at room temp

  UNS S32750 Thermal Properties

 CTE Linear                       13.0mm/m-ºC (@temp 100ºC)

                                           13.5mm/m-ºC (@temp 200ºC)

                                            14.0mm/m-ºC (@temp 300ºC)

                                             14.5mm/m-ºC (@temp 400ºC)

Specific Heat Capacity     0.500J/g-ºC                             20ºC

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