S32550 Duplex Stainless Steel (Amazon 256) – Superior Corrosion Resistance & Strength
1.4507 (X2CrNiMoCuN25-6-3) is a super duplex stainless steel widely used in critical offshore, petrochemical and chemical plant applications. It is based on a 26% chromium and 6% nickel composition. The grade has very good pitting and crevice corrosion resistance resulting from a controlled addition of copper, as well as excellent ductility and impact strength at both ambient and sub-zero temperatures, combined with a high resistance to abrasion, erosion and cavitation erosion. These features make it particularly suitable for use in seawater and other chloride-containing environments. 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 | 760 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 | 0.04 % | max. | |
Chromium | 24 - 27 % | ||
Copper | 1.5 - 2.5 % | ||
Iron | Balance | ||
Manganese | 1.5 % | max. | |
Molybdenum | 2.9 - 3.9 % | ||
Nickel | 4.5 - 6.5 % | ||
Nitrogen | 0.1 - 0.25 % | ||
Phosphorus | 0.04 % | max. | |
Silicon | 1 % | max. | |
Sulfur | 0.03 % | max. | |
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, mixing plant and high strength fasteners;Other: Nuclear waste casks, medical instruments, paper mill equipment and chemical process plants, mechanical components including springs, screws, bolts, gears, bushes and wear rings | |
| Corrosion properties | Excellent general corrosion resistance | |
| General machinability | Good machinability | |
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