S32760 / SEACOL-760: Advanced Super‑Duplex Stainless Steel for Exceptional Pitting Resistance
1.4501 (X2CrNiMoCuWN25-7-4) is a grade of super-duplex based on 25% chromium, 7% nickel with an addition of tungsten which enhances the pitting index (PREN) even further above the 40 minimum and also contributes to alloy strength. This high resistance to pitting is combined with a high tensile strength and higher resistance to stress corrosion cracking at moderate temperatures to that of conventional austenitic stainless steels. A small addition of copper (lower than in S32550/AMAZON 256) enhances its general corrosion resistance. It shows the following features and properties:
Properties
General
| Property | Temperature | Value |
|---|---|---|
Density | 23.0 °C | 7.8 g/cm³ |
Mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
Elastic modulus | 23.0 °C | 199 GPa | |
Elongation | 23.0 °C | 25 % | |
Hardness, Brinell | 23.0 °C | 270 [-] | max. |
Poisson's ratio | 23.0 °C | 0.32 [-] | |
Shear modulus | 23.0 °C | 75 GPa | |
Tensile strength | 23.0 °C | 750 MPa | |
Yield strength Rp0.2 | 23.0 °C | 550 MPa |
Thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
Coefficient of thermal expansion | 23.0 °C | 1.11E-5 1/K | for 20-100°C |
Specific heat capacity | 23.0 °C | 425 J/(kg·K) | |
Thermal conductivity | 23.0 °C | 14 W/(m·K) | for 20-300°C |
Electrical
| Property | Temperature | Value |
|---|---|---|
Electrical resistivity | 23.0 °C | 8E-7 Ω·m |
Magnetic
| Property | Temperature | Value |
|---|---|---|
Relative magnetic permeability | 23.0 °C | 33 [-] |
Chemical properties
| Property | Value | Comment | |
|---|---|---|---|
Carbon | 0.03 % | max. | |
Chromium | 24 - 26 % | ||
Copper | 0.5 - 1 % | ||
Iron | Balance | ||
Manganese | 1 % | max. | |
Molybdenum | 3 - 4 % | ||
Nickel | 6 - 8 % | ||
Nitrogen | 0.2 - 0.3 % | ||
Phosphorus | 0.03 % | max. | |
Silicon | 1 % | max. | |
Sulfur | 0.01 % | max. | |
Tungsten | 0.5 - 1 % | ||
Technological properties
| Property | ||
|---|---|---|
| Application areas | Offshore & marine: Offshore platforms, components for gas, oil and process cooling plants, instrumentation, wellhead and subsea wellhead fittings, desalination plants, seawater cooled heat exchangers, cargo heating systems, marine shafts (for boats etc) and high strength fasteners;Chemical processing: Equipment handling organic or dilute sulphuric acid, process solutions contaminated with chlorides, refinery equipment, desulphurising and distillation units, sewage plant components, fire extinguishing systems, general processing and mixing plant | |
| Corrosion properties | Very good corrosion resistance | |
Metal
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