| AISI 9255 | |
 | |
| Category | Steel |
| Class | Alloy steel |
| Type | Standard |
| Common Names | Silicon-manganese steel |
| Designations |
France: AFNOR 55 S 7 Germany: DIN 1.0904 Italy: UNI 55 Si 8 Sweden: SS 2090 United Kingdom: B.S. 250 A 53 United States: ASTM A322 , SAE J404 , SAE J412 , SAE J770 , UNS G92550 |
| Composition | |
| |
| Mechanical Properties | |
| |
| Properties | Conditions | ||
| T (°C) | Treatment | ||
| Density (×1000 kg/m3) | 7.7-8.03 | 25 | |
| Poisson's Ratio | 0.27-0.30 | 25 | |
| Elastic Modulus (GPa) | 190-210 | 25 | |
| Tensile Strength (Mpa) | 774.3 | 25 | annealed at 845°C more |
| Yield Strength (Mpa) | 486.1 | ||
| Elongation (%) | 21.7 | ||
| Reduction in Area (%) | 41.1 | ||
| Hardness (HB) | 229 | 25 | annealed at 845°C more |
| Impact Strength (J) (Izod) |
8.8 | 25 | annealed at 845°C more |
