| AISI 8620 | |
 | |
| Category | Steel |
| Class | Alloy steel |
| Type | Standard |
| Common Names | Nickel-chromium-molybdenum steel |
| Designations |
France: AFNOR 20 NCD 2 , AFNOR 22 NCD 2 Germany: DIN 1.6523 Italy: UNI 20 NiCrMo 2 Japan: JIS SNCM 21 , JIS SNCM 21 H United Kingdom: B.S. 805 H 20 , B.S. 805 M 20 United States: AMS 6274 , AMS 6274G , AMS 6276 , AMS 6276C , AMS 6277 , AMS 6277A , ASTM A322 , ASTM A331 , ASTM A505 , ASTM A513 , MIL SPEC MIL-S-16974 , SAE J404 , SAE J770 , UNS G86200 |
| Composition | |
| |
| Element | Weight % |
| C | 0.18-0.23 |
| Mn | 0.70-0.90 |
| P | 0.035 (max) |
| S | 0.04 (max) |
| Si | 0.15-0.30 |
| Cr | 0.40-0.60 |
| Ni | 0.40-0.70 |
| Mo | 0.15-0.25 |
| 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) | 536.4 | 25 | annealed at 870°C more |
| Yield Strength (Mpa) | 385.4 | ||
| Elongation (%) | 31.3 | ||
| Reduction in Area (%) | 62.1 | ||
| Hardness (HB) | 149 | 25 | annealed at 870°C more |
| Impact Strength (J) (Izod) |
112.2 | 25 | annealed at 870°C more |