Corrosion and Oxidisation Resistance of 304
304 Stainless Steel shows excellent corrosion and oxidisation resistance in a range of atmospheric environments and many corrosive substances.
It is resistant to potable water containing up to approximately 200mg/L chlorides at room temperature 20°C (68°F) to 25°C (77°F), this reduces to about 150mg/L at around 60°C (140°F).
EN 1.4301 304 Stainless Steel provides good oxidisation resistance in intermittent service to 870°C (1,598°F) and continuous service to 925°C (1697°F) The use of 304 Stainless Steel is not recommended in the range of 425-860°C (797-1580°F) if subsequent aqueous corrosion resistance is required.
Chemical Composition of 304
| C | Mn | Si | P | S | Cr | Mo | Ni | N |
Min |
|
|
|
|
| 18.0 |
| 8.0 |
|
Max | 0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 |
| 10.5 | 0.10 |
304 Stainless Steel provides excellent welding with and without filler metals using standard fusion methods. Post-weld annealing is not required when welding thin sections however heavy welded sections may require some post-weld annealing for optimal corrosion resistance.
For optimal annealing heat to 1010-1120°C (1850-2048°F) and cool rapidly with air or water.
EN 1.4301 304 Stainless Steel cannot be hardened by thermal treatment.
Mechanical Properties of 304
Yield Strength 0.2% (MPa) min | Tensile strength (MPa) min | Elongation (% in 50mm) min | Rockwell B (HR B) max | Brinell (HB) max |
205 | 515 | 40 | 92 | 201 |
Physical Properties of 304
Density (kg/ m cube) | Elastic Modulus (GPa) | Specific heat 0-100°C (J/kg.K) | Electrical resistivity (nW.m) |
8000 | 193 | 500 | 720 |
Mean Coefficient of Thermal Expansion (μm/m/°C)
0-100°C | 0-315°C | 0-538°C |
17.2 | 18.4 | 16.2 |
Thermal Conductivity (W/m.K)
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