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Alloy steels comprise a spectrum of steels whose compositions include the elements Ni, Si, Va, C, Mo, Cr, Mn, and B which have been fixed for carbon steels. These steels are more responsive to mechanical and heat treatments than carbon steels
| Element | Fe | Cr | Mn | C | Si | Mo | S | P |
|---|---|---|---|---|---|---|---|---|
| Content (%) | ≥ 96.725 | 0.80-1.10 | 0.75-1.10 | 0.40-0.45 | 0.15-0.30 | 0.15-0.25 | ≤ 0.040 | ≤ 0.035 |
| Properties | Metric | Imperial |
|---|---|---|
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Hardness, Brinell (annealed and cold drawn) | 187-229 | 187-229 |
| Hardness, Knoop (converted from Brinell hardness) | 230 | 230 |
| Hardness, Rockwell B (converted from Brinell hardness) | 94 | 94 |
| Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) | 15 | 15 |
| Hardness, Vickers (converted from Brinell hardness) | 218 | 218 |
| Machinability (annealed and cold drawn, based AISI 1212 steel, as on 100 machinability) | 65 | 65 |