DUPLEX SS 32760

Duplex stainless steel 32760 is a hot super alloy which is normally delivered in the annealed condition. It is two-phase alloy with austenite and ferrite in almost equal contents in the microstructure.

The balanced chemical composition of the grade provides a combination of mechanical strength, excellent ductility, and resistance in highly corrosive environments. The grade was initially used in marine applications but given its excellent properties, it also came into use in several chemical applications.

Duplex stainless steels are normally not used at elevated temperatures but when this grade is pushed at an increased temperature, it does not lose much yield strength. At a temperature of about 250°C, the yield strength of the grade remains about 400 MPa and UTS remains about 650 MPa. A high-pitting resistance is guaranteed by the grade in delivered condition. Pitting resistance number (PREN) of the grade is normally greater than 40, which is better than other austenitic and duplex grades. It also provides superior resistance to overall localized corrosion.

Tungsten is normally an impurity, but the addition of tungsten in the grade certainly enhances the pitting resistance and has its value in the PREN formula. A small addition of copper in 32760 makes sure that resistance to variable non-oxidizing and mineral acids is provided. The 25% chromium in the grade along with other alloying elements, gives the grade superior corrosion, oxidation resistance, better strength and better stress corrosion resistance to other 300 series alloys and many 22% Cr alloys. The grade has fine forming characteristics and can be appropriately forged around 1100-1250°C. Reheat might be required for complete forging, followed by cooling in air. The grade has significant impact strength and is used in many applications for the same purposes. Very less decrease in impact strength is obtained with a decrease in temperature.

The lost impact strength is retained post-welding. No ductile to brittle transition is obtained at lower temperatures, hence excellent ductility is one of its prime properties. Even at sub-zero temperatures, down to -50°C, ductility and mechanical properties are preserved.

Chemical Properties

Grade   Ni C Cr Mn Si P CU Fe Mo W

32760

Min. 6 0.2 24 0.5 Balance 3
Max. 8 1 26 1 0.030 0.010 1 4 0.03

Physical Properties:

Density kg/cm3) 7810
Melting Point 1400~1450 C
Specific Heat 0-100°C ( J/kg.K) 466
Thermal Conductivity at 20°C 14.2
Young Modulus (GPa) 199
Magnetic Permeability (20°C) 33
Electrical resistivity [μΩ . cm] 99


General 

Standard 32760
UNS S32760
WERKSTOFF NR. 1.4501
EN X2CrNiMoCuWN25.7.4
SS 10088-3
AFNOR Z3CND25.06Az
JIS NAS75N

Application areas:

Oil and chemical tankers, Sewage treatment, Agrochemicals production, Oil & Gas industry pumps, valves, pipe, vessels, Subsea pipework systems, Flue gas desulphurisation (FGD) plants, Equipment handling organic & fatty acids, Centrifuges and agitators, Storage tanks and pressure vessels, Desalination plants, Food Industry applications including sugar cane centrifuges, corn and vegetable processing plant, Marine industry and shipbuilding propellers, shafts, rudders, shaft seals, pumps, bolts, fasteners, valves, instrumentation, Pollution control systems, fans and pumps, Seawater systems, Pulp & paper industry components, Process industry components.

Form of supply :

Piping and tubing, fittings and flanges, washers.

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