CSA G40.21 350A/350AT Weathering Steel
CSA G40.21 350A/350AT Weathering Steel
Canadian atmospheric-corrosion-resistant structural steel for bridges, exposed structures and applications using a protective weathering patina.
Representative Properties
- Typical tensile strength: 480 MPa
- Typical yield strength: 350 MPa
- Typical density: 7.85 g/cm³
- Typical hardness: 150 HB
- Standard: CSA G40.21 Grade 350A / 350AT
Values are representative for the named grade and condition. Final design and procurement must use certified supplier data and the applicable standard.
Material properties
| Material name | CSA G40.21 350A/350AT Weathering Steel |
|---|---|
| Type | Carbon & Alloy Steel |
| Standard code | CSA G40.21 Grade 350A / 350AT |
| Tensile strength (MPa) | 480 |
| Yield strength (MPa) | 350 |
| Fatigue strength (MPa) | 210 |
| Elongation (%) | 18 |
| Hardness (Brinell) | 150 |
| Density (g/cm³) | 7.85 |
| Electrical resistivity (µΩ·in) | 7.5 |
| Thermal conductivity (W/m·K) | 48 |
| Melting range (°C) | 1425–1538 |
| Weldability | Excellent |
| Formability | Good |
| Shear modulus | 80 |
| Industry code | csa_g40_21_350a_350at |