ASTM A242 is a weathering structural steel designed to provide improved resistance to atmospheric corrosion compared with conventional carbon structural steels. Its alloying elements promote the formation of a stable protective oxide layer, allowing the steel to withstand outdoor exposure while maintaining structural integrity.
The grade is commonly used in bridges, buildings, towers, railway structures, industrial equipment, and other outdoor applications where long-term durability and reduced painting or maintenance are desired. ASTM A242 is available in different grades and thickness ranges, with mechanical properties depending on the product form and thickness.
Final chemical, mechanical properties, dimensions and tolerances are confirmed against the governing specification and purchase order.
| Element | C | Mn | P | S | Cu | Cr | Ni |
|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | 0.20 | - | - |
| Max | 0.15 | 1.00 | 0.15 | 0.05 | 0.55 | 0.50 | 0.40 |
| Property | Yield Strength | Tensile Strength | Elongation |
|---|---|---|---|
| Min | 50 ksi [345 MPa] | 70 ksi [480 MPa] | 18% |
| Max | - | - | - |
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