S31803 Duplex Stainless Steel – High‑Strength, Corrosion‑Resistant Solution for Petrochemical & Offshore Applications
1.4462 (X2CrNiMoN22-5-3) is the basic grade of duplex stainless steel based on a 22% chromium and 5% nickel content. It is suitable for applications which involve high mechanical stresses and severe corrosion conditions, particularly where there is frequent contact with high levels of chlorides, carbon dioxide and hydrogen sulphide as may be encountered in the gas, petrochemical and offshore industries. Columbia Metals stocks S31803 in the solution treated and quenched condition. 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 | 620 MPa | |
Yield strength Rp0.2 | 23.0 °C | 448 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 | 21 - 23 % | ||
Iron | Balance | ||
Manganese | 2 % | max. | |
Molybdenum | 2.5 - 3.5 % | ||
Nickel | 4.5 - 6.5 % | ||
Nitrogen | 0.08 - 0.2 % | ||
Phosphorus | 0.02 % | max. | |
Silicon | 1 % | max. | |
Sulfur | 0.02 % | max. | |
Technological properties
| Property | ||
|---|---|---|
| Application areas | Offshore & marine: Offshore pipework, components for gas, oil and process cooling plants, wellhead and subsea wellhead fittings, desalination plant, seawater cooled heat exchangers and high strength fasteners;Chemical processing: Chemical tanks, flue gas filters, acetic acid distillation parts and heat exchangers | |
| Corrosion properties | Very good corrosion resistance | |
| General machinability | Good workability | |
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