| AISI S5 | |
 | |
| Category | Steel |
| Class | Tool steel |
| Type | Shock-resisting steel |
| Designations | United States: ASTM A681 , FED QQ-T-570 , SAE J437 , SAE J438 , UNS T41905 |
| Composition | |
| |
| Element | Weight % |
| C | 0.50-0.65 |
| Mn | 0.60-1.00 |
| Si | 1.75-2.25 |
| Cr | 0.35 |
| Mo | 0.20-135 |
| V | 0.35 |
| 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) | 725 | 25 | annealed more |
| Yield Strength (Mpa) | 440 | ||
| Elongation (%) | 25 | ||
| Reduction in Area (%) | 50 | ||
| Hardness (HRB) | 96 | 25 | annealed more |
| Impact Strength (J) (Charpy unnotched) |
206 | 25 | oil quenched from 870°C, single tempered at 205°C more |
| Thermal Properties | |
| |