Alloy 32760 (Plate) (UNS S32760)

Description:

Alloy 32760 is a super duplex stainless steel supplied in the hot worked and solution annealed condition. As a super duplex stainless steel, it combines the desirable aspects of both austenitic and ferritic grades. The higher chromium, molybdenum and nitrogen contents result in a Pitting Resistance Equivalent number (PREN) of >40, providing pitting and crevice corrosion resistance superior to austenitic and duplex stainless steels in almost all corrosive media, and a Critical Pitting Temperature exceeding 50°C   nb.versions of the PREN formula also include W as a positive influence on overall pitting resistance.

It provides higher strength than both austenitic and 22% Cr duplex stainless steels, and is listed in NACE MR 0175 for sour service and ASME for pressure vessel applications.

Key Features:

  • Excellent corrosion resistance in a wide variety of corrosive chemicals
  • Pitting Resistance Equivalent number (PREN) of >40
  • Outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments
  • Critical Pitting Temperature exceeding 50°C
  • High strength compared to austenitic and 22%Cr duplex stainless steels
  • 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 in chloride containing environments
  • Listed in NACE MR 0175 for sour service
  • ASME Approval for Pressure Vessel application

Applications:

  • Process industry components in nitric acid, dioxide, polypropylene & PVC production, caustic
  • Equipment handling organic & fatty acids
  • Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation
  • Oil and chemical tankers
  • Oil & Gas industry pumps, valves, pipe, vessels, wellhead equipment, subsea equipment
  • Pollution control systems, fans and pumps, wet scrubbers, incinerators, flue gas desulphurisation (FGD)
  • Pulp & paper industry components such as black liquor heater tubes, digester blow valves, rotary feed valves, I.D.fans, brownstock washers, precipitators, bleaching components
  • Food Industry applications including sugar cane centrifuges, corn and vegetable processing plant
  • Agrochemicals production such as fertilisers (based on wet phosphoric acid)
  • Sewage treatment, seawater cooling, desalination plants

Chemical Composition:

Cr Ni Mo Co Nb (+Ta) Ti V W Cu C Mn N Si P S Fe Al
Min 24.00 6.00 3.00 0.50 0.50 0.20
Max 26.00 8.00 4.00 1.00 1.00 0.025 1.00 0.30 1.00 0.025 0.005 Bal 0.01

Mechanical Properties:

0.2% Proof Stress 550 N/mm2 79.8 ksi
Tensile Strength 750 N/mm2 108.8 ksi
Elongation, 5.65√S0 25%
Reduction of area 45%
Hardness (Brinell) 270HBN max
Impact Strength (Room Temp) 80J 59 lb.ft
Impact Strength (-46oC) 60J av (45J min) 44 lb.ft av (33 lb.ft min)

Notes:

  1. Testing shall be carried out in accordance with ASTM A370 or EN ISO 6892-1 (tensile), EN ISO 6506-1 (hardness)
  2. Minimum properties quoted (tested at room temperature in a longitudinal direction
  3. Testing performed on each melt of material per heat treatment batch
  4. Hardness shall be in accordance with NACE MR 1075 with a maximum HRC of 28
  5. ASTM G48A corrosion test (at 50degC) No pitting and < 3.0g/m2 weight loss (ASTM specification <4.0g/m2)
  6. Ferrite content 35-55%
  7. Microstructure certified free from grain boundary carbides, sigma, chi and laves phases

Physical Properties:

Density (Kg/m3) 7810
Magnetic Permeability (20°C) 33
Young’s Modulus (kN/mm2) 199
Specific Electrical Resistance, 20°C (µΩ.m) 0.8
Mean coefficient of thermal expansion, 20-300°C (m/m/oC) 11.1 x 10-6
Specific Heat, 20°C (J/kg.K) 475
Thermal conductivity, 20°C (W/m.K) 14.2
Fracture Toughness, kQ (MPa/m2) 98

Downloads

Datasheet - SD-Alloy 32760 Plate

Datasheet - SD-Alloy 32760 Plate