Stainless Steel - Duplex - 1.4501/ F55 Super Duplex

1.4501/ F55 Super Duplex

Duplex and Superduplex UNS S32760 (F55) give significant life cycle cost advantages when used in severe and corrosive conditions. Superduplex is available in bar, sheet, plate, tube, pipe and fittings.

Both materials have exceptional resistance to pitting, crevice corrosion and to stress corrosion cracking and have high strength combined weldability. Duplex and Superduplex can be used for many applications including propeller shafts, seawater oil and gas piping systems on offshore platforms, seawater piping systems in desalination plants, subsea manifolds and flowlines, subsea pipeline systems, topside process systems, subsea umbilicals and submerged components.

Chemical Composition

Spec: UNS S32760

1.4501 Steel

Chemical Element % Present
Carbon (C) 0.0 - 0.03
Chromium (Cr) 24.00 - 26.00
Manganese (Mn) 0.0 - 1.00
Silicon (Si) 0.0 - 1.00
Phosphorous (P) 0.0 - 0.03
Sulphur (S) 0.0 - 0.01
Nickel (Ni) 6.00 - 8.00
Nitrogen (N) 0.20 - 0.30
Copper (Cu) 0.50 - 1.00
Molybdenum (Mo) 3.00 - 4.00
Tungsten (W) 0.50 - 1.00
Iron (Fe) Balance


Physical PropertyValue
Density 7.81 g/cm³
Thermal Expansion 17.2 x10^-6 /K
Thermal Conductivity 14.2 W/m.K
Electrical Resistivity 0.8 x10^-6 Ω .m

Spec: EN 10088-3:2005

Bar & Section - Up to 160mm Dia / Thickness

Mechanical PropertyValue
Elongation A50 mm 25 %
Hardness Brinell 270 Max HB
Tensile Strength 750 N/mm2
0.2% Proof Stress 550 N/mm2

Alloy Designations



NACE MR0175 ISO 15156


Supplied Forms

  • Sheet
  • Tube
  • Bar
  • Fittings & Flanges
  • Pipe
  • Plate
  • Rod

Cold Working


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Last Datasheet Revision

13 July 2016


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.

Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.