Mechanical Properties:
– Tensile strength: 900-1100 MPa
– Yield strength: 650-800 MPa
– Elongation: 12-15%
– Impact energy: 27 J (at -20°C)
Technical Properties:
– Hardness: 160-260 HB
– Young’s Modulus: 190-210 GPa
– Poisson’s Ratio: 0.27-0.30
– Thermal expansion: 11.5 x 10^-6/K
Chemical Composition:
– Carbon (C): 0.38-0.45%
– Silicon (Si): 0.15-0.30%
– Manganese (Mn): 0.60-0.90%
– Phosphorus (P): Max 0.025%
– Sulfur (S): Max 0.035%
– Chromium (Cr): 0.90-1.20%
– Molybdenum (Mo): 0.15-0.30%
Heat Treatment:
The heat treatment process for 42CrMo4 steel typically involves quenching and tempering to achieve the desired mechanical properties. After forging, the steel is heated to a temperature of 850°C-880°C and then quenched in oil or water. This is followed by tempering at a temperature of 550°C-660°C. The exact heat treatment process may vary depending on the specific application and required properties.
In conclusion, the 42CrMo4 steel grade offers excellent mechanical properties and can be effectively heat treated to achieve the desired strength and toughness for various industrial applications. The chemical composition, technical properties, and heat treatment process play a significant role in determining the performance of this steel grade.
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