SAE J1268 Grade 8640H
Equivalent material: DIN 1.6546, DIN 40NiCrMo2-2, AFNOR 40NCD2, BS 311-TYPE7, UNI 40NiCrM02(KB), UNE 40NiCrMo2, AISI 8640, AISI 8640H, AISI 8740H, AISI 8740, SAE 8640, SAE 8740H, SAE 8740, JIS SNCM240, JIS SNCMRCH240, JIS SNCMWCH240, EN 1.6546, GOST 38ChGNM, ASTM 8470, ASTM 8640H, ASTM 8640, UNS G86400, UNS H86400, UNS H87400, UNS G87400
SAE J1268 Grade 8640H general
| Property |
Temperature |
Value |
Comment |
| Density |
23.0 °C |
Density of 7.8 - 7.9 g/cm³ |
Typical for Nickel Chromium Molybdenum Steel |
SAE J1268 Grade 8640H thermal
| Property |
Temperature |
Value |
Comment |
| Coefficient of thermal expansion |
23.0 °C |
Coefficient of thermal expansion of 1E-5 - 1.3E-5 1/K |
Typical for Nickel Chromium Molybdenum Steel |
| Melting point |
- |
Melting point of 1382 - 1529 °C |
Typical for Nickel Chromium Molybdenum Steel |
| Specific heat capacity |
23.0 °C |
Specific heat capacity of 448 - 670 J/(kg·K) |
Typical for Nickel Chromium Molybdenum Steel |
| Thermal conductivity |
23.0 °C |
Thermal conductivity of 34 - 54 W/(m·K) |
Typical for Nickel Chromium Molybdenum Steel |
SAE J1268 Grade 8640H electrical
| Property |
Value |
| Carbon |
Carbon of 0.37 - 0.44 % |
| Chromium |
Chromium of 0.35 - 0.65 % |
| Copper |
Copper of 0.35 % |
| Iron |
balance |
| Manganese |
Manganese of 0.7 - 1.05 % |
| Molybdenum |
Molybdenum of 0.15 - 0.25 % |
| Nickel |
Nickel of 0.35 - 0.75 % |
| Phosphorus |
Phosphorus of 0.03 % |
| Silicon |
Silicon of 0.15 - 0.35 % |
| Sulfur |
Sulfur of 0.04 % |
SAE J1268 Grade 8640H mechanical
| Property |
Temperature |
Value |
Comment |
| Elastic modulus |
23.0 °C |
Elastic modulus of 200 - 215 GPa |
Typical for Nickel Chromium Molybdenum Steel |
| Poisson's ratio |
23.0 °C |
Poisson's ratio of 0.29 [-] |
Typical for Nickel Chromium Molybdenum Steel |
