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Super Duplex 32760

Super Duplex UNS 32760 has excellent corrosion resistance to a wide variety of media, with outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C.
Providing higher strength than both austenitic and 22% Cr Duples Stainless Steels 32760 is suited to a variety of applications in industries such as Chemical Processing, Oil & Gas, and Marine environments.
Super Duplex UNS 32760 is listed in NACE MR 01 75 for sour service and having gained ASME Approval for Pressure Vessel applications.

Chemical Specification

Elements C Cr Cu Fe Mo Mn N Ni P S Si W
Minimum   24.0 0.5 REMAINDER 3.0   0.20 6.00       0.50
Maximum 0.030 26.00 1.0   4.0 1.0 0.30 8.00 0.030 0.010 1.00 1.00

Mechanical Properties

0.2% Proof Stress (N/mm2 ) [ksi] minimum 550 [79.8]
Ultimate Tensile Strength (N/mm2) [ksi] minimum 750 [108.8]]
Elongation (%) minimum 25
Hardness (HBN) 270max
Reduction of Cross Section Area (%) minimum 45
Charpy V-notch Impact at ambient Temp (J) [ft.lb] 80min [59min]
Charpy V-notch Impact at -46°C (J) [ft.lb] 45av, 35min [33av, 25.8min]

Additional Testing
ASTM G48A Corrosion test at 50°C No pitting and weight loss <0.8g/m2
Ultrasonic Testing According to ASTM A388
Ferrite Content 35%-55%
Microstructure Microstructure certified free from grain boundary carbides, sigma, chi and laves phases

Physical Properties

Density (Kg.m-3) 7810
Magnetic Permeability 33
Young’s Modulus (N/mm2) 199 x 103
Fracture Toughness, KQ  (MPa.m½) 98
Specific Heat, 20°C (J.Kg-1.°K-1) 475
Specific Electrical Resistance, 20°C (µO.m) 0.80
Thermal conductivity, 20°C (W.m-1.°K-1) 14.2
Mean coefficient of thermal expansion, 20-100°C (°K-1) 11.1 x 10-6

Key Features

  • High strength compared to austenitic and 22% chrome duplex stainless steels
  • Excellent corrosion resistance in a wide variety of corrosive chemicals including seawater and industrial acids
  • Excellent ductility and impact strength at both ambient and sub-zero temperatures
  • High resistance to abrasion, erosion and cavitation erosion Excellent resistance to stress corrosion cracking
  • Applicable for sour service operation
  • Specified for pressure vessel applications


Chemical Process Industry:

Nitric Acid Processes, Polypropylene Production, PVC Production, Dioxide, Caustic Evaporators, Equipment Handling Organic and Fatty Acids

Marine Industry and Shipbuilding:

Propellers and Shafts, Rudders, Shaft Seals, Pumps, Bolts and Fasteners, Valves, Instrumentation, Oil and Chemical Tankers

Oil and Gas Industry:

Pumps, Valves, Pipe, Vessels, Wellhead Equipment, Subsea Equipment

Pollution Control:

Fans and pumps, Wet Scrubbers, Incinerators

Pulp and Paper Industry:

Black liquor heater tubes, Digester Blow Valves, Rotary Feed Valves, I.D.Fans, Brownstock Washers, Precipitators, Bleaching Components

Food Industry:

Sugar Cane Centrifuges, Corn and Vegetable processing plant


Fertiliser Production (Wet phosphoric acid)

Civil Engineering:

Sewage Treatment