The service conditions of the liner plates were analysed and the disadvantages of high manganese steel, commonly used material for liner plates were found: the small impact of the mill balls minerals in the grinding miller can not make the high manganese steel harden enough and the potential wear-resistance not develop effectively. So the wear-life of the liner plates is not longer enough. Grinding and impacting can easily make the liner plates larger and more deformable because the yield strength of the high manganese steel is low and disassembly of the liner plates is very difficult. It is very important to seek a new material for liner plates with high wear-resistant to meet different service conditions and then disassemble all the liner plates in the different parts of grinding miller one time after some period of service and run the equipment very well. For the liner plates in the different parts of the miller need different wear-resistance and disassembly of liner plates is carried out at one time, different alloy elements and their addition are chosen and different heat treatments are used in this experiment to get the different amount of austenite, bainite, martensite and varying mechanical properties. The experiment shows that lowering the austenizing temperature and austempering temperature can get a lot of bainite content faster, which means the period of production become shorter. It is found that austenite content 3-9%, beinite content 42-65% and matensite content 10-23% is suitable for liner plates of grinding miller. The wear-life of the liner plates in the production is as three times long as the liner plates by high manganese steel.
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