| AISI S7 | |
 | |
| Category | Steel |
| Class | Tool steel |
| Type | Shock-resisting steel |
| Designations | United States: ASTM A681 , UNS T41907 |
| Composition | |
| |
| Element | Weight % |
| C | 0.45-0.55 |
| Mn | 0.20-0.80 |
| Si | 0.20-1.00 |
| Cr | 3.00-3.50 |
| Mo | 1.30-1.80 |
| V | 0.20-0.30(a) |
| Cu | 0.25 |
| P | 0.03 |
| S | 0.03 |
| Mechanical Properties | |
| |
| Properties | Conditions | ||
| T (°C) | Treatment | ||
| Density (×1000 kg/m3) | 7.76 | 25 | |
| Poisson's Ratio | 0.27-0.30 | 25 | |
| Elastic Modulus (GPa) | 190-210 | 25 | |
| Tensile Strength (Mpa) | 640 | 25 | annealed more |
| Yield Strength (Mpa) | 380 | ||
| Elongation (%) | 25 | ||
| Reduction in Area (%) | 55 | ||
| Hardness (HRB) | 95 | 25 | annealed more |
| Impact Strength (J) (Charpy unnotched) |
244 | 25 | fan cooled from 940°C, single tempered at 205°C more |
| Thermal Properties | |
| |
