Bellow is a comparison chart with information about the chemical composition and the mechanical properties of both 1008 grade steel and 1018 grade steel. This information can be helpful for anyone involved in machining or is interesting in purchasing either 1008 or 1018 steel.
Chemical Composition
The chemical features of 1008 and 1018 steel are the following.
| 1008 | 1018 | |
| Carbon, C | 0.10% Max | 0.18% |
| Manganese, Mn | 0.30-0.50% | 0.60-0.90% |
| Sulfur, S (Max) | 0.050% | 0.050% |
| Phosphorus, P (Max) | 0.040% | 0.040% |
Mechanical Properties
The following are the mechanical properties of 1008 and 1018 steel. Both 1008 and 1018 can be produced as cold drawn or hot rolled, so we provide mechanical properties for both.
Cold Drawn
| 1008 | 1018 | |
| Tensile Strength | 49,000 psi | 64,000 psi |
| Yield Strength | 41,500 psi | 54,000 psi |
| Elongation (2″) | 20% | 15% |
| Reduction in Area | 45% | 40% |
| Brinell Hardness | 95 | 126 |
Hot Rolled
| 1008 | 1018 | |
| Tensile Strength | 44,000 psi | 58,000 psi |
| Yield Strength | 24,500 psi | 32,000 psi |
| Elongation (2″) | 30% | 25% |
| Reduction in Area | 55% | 50% |
| Brinell Hardness | 86 | 116 |
The relative machinability Rating percentage based on SAE1212 as 100% for 1008 in the cold drawn state is 55% and for 1018 is 70%.
