| AISI 4340H | |
 | |
| Category | Steel |
| Class | Alloy steel |
| Type | H-steel |
| Common Names | Nickel-chromium-molybdenum steel |
| Designations |
Germany: DIN 1.6565 Japan: JIS SNCM 8 United Kingdom: B.S. 2 S 119 , B.S. 3 S 95 , B.S. 3111 Type 6 , B.S. 817 M 40 United States: ASTM A304 , SAE J1268 , UNS H43400 |
| Composition | |
| |
| Element | Weight % |
| C | 0.37-0.44 |
| Mn | 0.55-0.90 |
| Cr | 0.65-0.95 |
| Ni | 1.55-2.00 |
| Mo | 0.20-0.30 |
| P | 0.035 |
| S | 0.040 |
| Si | 0.15-0.30 |
| 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) | 745 | 25 | annealed at 810°C more |
| Yield Strength (Mpa) | 475 | ||
| Elongation (%) | 22 | ||
| Reduction in Area (%) | 50 | ||
| Hardness (HB) | 217 | 25 | annealed at 810°C more |
| Thermal Properties | |
| |
| Electric Properties | |
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