Low-alloy Wear-resistant Steel Crushing Machine Liner Manufacturing Process And Properties

Wearing is the main reason for the failure of mechanical parts, which will cause huge economical losses. Therefore, it is of great importance to modify the wear resistance and reduce the wearing consumption of the materials. Liner is one of the wear components of the crushing machine. Its wear resistance directly affects the life and production costs of the crusher.According to the working conditions and performance requirements of the liner, the composition of the liner material was designed. A new type of multi-element low alloy steel with high strength, high toughness and wear resistance was developed. A new type of iron sand EPC (Evaporative Pattern Casting) technology was developed and the optimized heat treatment process was designed. The chemical composition of the liner was designed with Mn, Si, Cr as the main alloying elements, adding a small amount of Mo, Cu, RE for micro-alloying and compound modification. The main range of the components (W% ) is: C: 0.42 ~ 0.48; Cr: 1.9 ~ 2.4; Mn: 1.0 ~ 1.3; Si: 0.9 ~ 1.4; Mo: 0.1 ~ 0.3; Cu: 0.3 ~ 0.6 ; RE: 0.4 ~ 0.6 and P,S≤0.03. In the aspect of the casting process, the iron sand negative pressure EPC process was designed. The heat treatment process was quenching at 910℃+ tempering at 250℃.The experiment results show that the low alloy wear resistant steel liner has a good harden ability. The strength and wear resistance reached the performance requirements of the liner. After quenched at 890 ~ 920℃and tempered at 250℃, the best comprehensive mechanical properties was obtained. Rockwell hardness is above HRC50 and the impact toughness above 18. The Microstructure is tempered martensite + bainite + retained austenite + carbide dispersion. The microstructure is the main reason of the good comprehensive mechanical properties. Compared with the original liner parts, the mechanical performance has been greatly improved.The main alloying elements used in this project is Mn,Si,Cr, which is a rich resource in our country and there is no precious alloying elements such as Ni, Ti and V. The production cost was greatly reduced. The liner produced with this manufacturing process has a good wear resistance and impact resistance. The service life of the liner was extended, and obvious economic and social efficiency can be obtained.