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Alloy steels are designated by AISI four-digit numbers. They are more susceptible to mechanical and heat treatments than carbon steels. Alloy Steel AISI 6150 comprise different types of steels with compositions which exceed the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va in the carbon steels
| Element | Fe | Cr | Mn | C | Si | V | S | P |
|---|---|---|---|---|---|---|---|---|
| Content (%) | 97.095 – 97.72 | 0.800 – 1.10 | 0.7 – 0.9 | 0.480 – 0.530 | 0.150 – 0.3 | ≥ 0.150 | ≤ 0.04 | ≤ 0.0350 |
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength, ultimate | 670 MPa | 97200 psi |
| Tensile strength, yield | 415 MPa | 60200 psi |
| Izod impact | 27 J | 19.9 ft-lb |
| Modulus of elasticity | 190-210 GPa | 27557-30458 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Poissons ratio (calculated) | 0.27 – 0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 23% | 23% |
| Hardness, Brinell | 197 | 197 |
| Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
| Hardness, Knoop (converted from Brinell hardness) | 219 | 219 |
| Hardness, Rockwell B (converted from Brinell hardness) | 92 | 92 |
| Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) | 13 | 13 |
| Machinability (annealed and cold drawn. Based on 100% machinability for AISI 1212 steel) | 55 | 55 |