The selection of quenching cooling medium is mainly considered in the following aspects:
1, the chemical composition of wear-resistant casting materials, the content of alloy elements, especially the carbon content of large parts.
2, steel austenitizing state and hardenability, and common isothermal transition diagram, continuous cooling transition diagram.
3, the material status of the wear-resistant casting itself (the nature and degree of the defect).
4, heat treatment of wear-resistant castings required performance and structure, wear-resistant castings allowed deformation variable size.
5. Size, effective thickness and shape complexity of wear-resistant castings.
6. Skill level of operators.
7. Environmental factors and relevant regulations.
The selection of quenching cooling medium usually refers to the medium cooling characteristic curve measured by the nickel-based alloy probe (including characteristic temperature, high cooling rate in low temperature zone, the highest and lowest cooling rate and the temperature range where they are located, etc.), as well as the GROSSMAN quenching intensity H value.
