The bridge steel ASTM A709 grade 50 is structural steel used in the construction of bridges. It is usually quenched and tempered to get good properties. The atmospheric corrosion resistance of bridge steel ASTM A709 grade 50 in most environments is substantially better than carbon steel with or without copper addition. That has much to do with ASTM A709 grade 50 chemical composition.
Heat analysis value of bridge steel ASTM A709 grade 50 chemical composition:
| Thickness(mm) | C | Si | Mn | P | S | Cu (Min) |
| T≤10 | 0.23 | 0.4 | 0.50-1.35 | 0.04 | 0.05 | 0.2 |
| 10<T≤40 | 0.80-1.35 | |||||
| 40<T | 0.15-0.40 |
As to ASTM A709 grade 50 chemical composition, when rolling the bridge steel ASTM A709 grade 50, for each reduction of 0.01% below the specified carbon maximum, an increase of 0.06 manganese above the specified maximum will be permitted up till maximum of 1.35%. The bridge steel ASTM A709 grade 50 is suitable for many applications in the unpainted condition if properly designed and exposed to the atmosphere.
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