S32760 Duplex

S32760 is a grade of Super-Duplex stainless steel based on 25% chromium / 7% Nickel with an addition of tungsten which enhances the pitting resistance number even further above the 40 PREN minimum and also contributes to alloy strength. Further to this a small addition of copper enhances its general corrosion resistance.

The high pitting and corrosion resistance is combined with a high tensile strength and higher resistance to stress corrosion cracking at moderate temperatures to that of conventional austenitic stainless steels. It is also listed in NACE MR 0175 for sour service and ASME for pressure vessel applications.

Chemical Composition:

Iron	Rem
Chromium	25.0%
Nickel	7.0%
Molybdenum	3.5%
Tungsten	0.75%
Copper	0.75%

Related Specifications

S32760	1.4501
ASME A182 F55	ASTM A276/A476

Key Features

Very high strength
Very high resistance to pitting
A very good corrosion resistance
A high resistance to erosion and abrasion in flowing systems
High resistance to stress corrosion cracking, fatigue and erosion

Physical Properties:

Density	7.81 Kg/cm
Magnetic Permeability (20°C)	33
Young’s Modulus	199 kN/mm²
Specific Electrical Resistance, 20°C	0.8 µ?.m
Coefficient of thermal expansion, 20-300°C	11.1 x 10-6 m/m/?C
Specific Heat, 20°C	475 J/kg.K
Thermal conductivity, 20°C	14.2 W/m.K

Applications

The 32760 duplex is used for components in gas, oil and process cooling plant, instrumentation, wellhead and subsea wellhead fittings, desalination plant, seawater cooled heat exchangers, refinery equipment, de-sulphurising and distillation units, sewage plant components, fire extinguishing systems, marine shafts and high strength fasteners.

This technical information is given by John Hood & Co.without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material.