Alloy 32750 is a super duplex stainless steel supplied in the 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 >41, 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.
Supplied in the annealed condition, it achieves yield strengths of 80ksi (550Mpa), greater than most austenitic and duplex stainless steel grades. It cannot be hardened by heat treatment but can be strengthened by cold working. It also exhibits a low coefficient of thermal expansion and higher heat conductivity than austenitic steels and is suitable for working temperatures up to 300°C. Alloy 32750 is listed in NACE MR 0175 for sour service and having gained ASME Approval for Pressure Vessel applications it can be used in a wide variety of applications.
Specifications:
1.4410
ASTM A276/A476
UNS S32750 (Super Duplex 32750)
ASME A182 Duplex F53
For enquiries about this product, call us on +44 (0)1782 610250
Excellent corrosion resistance in a wide variety of corrosive chemicals
Pitting Resistance Equivalent number (PREN) of >41
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 evaporators
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)
Testing shall be carried out in accordance with ASTM A370 or EN ISO 6892-1 (tensile), EN ISO 6506-1 (hardness)
Minimum properties quoted (tested at room temperature in a longitudinal direction)
Testing performed on each melt of material per heat treatment batch
Hardness shall be in accordance with NACE MR 1075 with a maximum HRC of 25
ASTM G48A corrosion test (at 50°C) No pitting and < 3.0g/m2 weight loss (ASTM specification < 4.0g/m2)
Ferrite content 35-55%
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
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