The comparison between ASTM A283 grade C and A36 steel is basically identified through the quantity of manganese in chemical composition as well as carbon equivalent (CEV).
A36 steel CEV = 0.25+0.4/24 = 0.266% and ASTM A283 grade C CEV = 0.24+0.4/24+0.9/6 = 0.406%. As a consequence, the carbon equivalent of ASTM A283 grade C steel is higher than A36 steel. And ASTM A283 grade C is little bit difficult to weld in compared to A36 steel.
ASTM A283 grade C steel VS A36 steel in chemical composition %:
| Grade | C (t≤16mm) | Si | Mn | P | S | Cu |
| A36 | 0.26 max | 0.40 max | - | 0.04 max | 0.05 max | 0.20 min |
| A283 grade C | 0.24 max | 0.04 max | 0.09 max | 0.035 max | 0.04 max | 0.20 min |
ASTM A283 grade C VS A36 steel in mechanical properties:
| Grade | Yield strength ReH/(N/mm2) (t≤16mm) min | Tensile strength Rm/(N/mm2) (3mm≤t≤16mm) | Elongation A/%(3mm≤t≤40mm) min |
| A36 | 250 | 400-550 | 23 |
| A283 grade C | 205 | 380-515 | 25 |
ASTM A283 grade C and A36 steel aren't exactly the same, but they are very close. Based on the weldability, it can consider that A36 steel can be used as alternative substitution of ASTM A283 grade C. However, if you decide by A36 steel as substitution to ASTM A283 grade C, further Engineering approval is required.
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