Reengineering of Technology for Producing Castings from High-Chromium Cast Iron ChKh28

One of the most crucial tasks for the mining, ore, and wood processing industries is import substitution and reengineering of components from foreign machinery. In this study, the chemical composition and structure of a worn component from crushing equipment are investigated using reengineering principles. It is determined that the examined samples are made from high-chromium cast iron ChKh28, additionally alloyed with molybdenum, vanadium, and nickel. The closest foreign analogue of this material may be the steel grade DIN 1695-81: G-260Cr27. The research results indicate that the casting material underwent heating to temperatures of 950–1050°C, followed by holding at these temperatures for a minimum of 2 h with subsequent air cooling to temperatures of 160–200°C and tempering at 200°C for a minimum of 2 h. This is confirmed by the hardness of the specimens reaching 63–64 HRC and the high degree of equilibrium in their structural-phase state and phase homogeneity.