ASTM A36 steel is one of the most widely used carbon structural steels, although A36 material has a maximum carbon content of 0.29%, it is considered a low carbon steel (carbon content ≤ 0.25%).
Chemical Composition
The following specification gives A36 carbon steel chemical composition in different product froms.
| Chemical Composition (%, ≤) for Shapes | ||||||
| Steel | C | Si | Mn | P | S | Cu |
| ASTM A36 | 0.26 | 0.40 | no requirement | 0.04 | 0.05 | 0.20 |
Note: Shapes with flange thickness greater than 3 in (75 mm) require a manganese content of 0.85-1.35% and a silicon content of 0.15-0.40%.

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