Self-strengthening wear resistant mechanism and application of medium manganese steel applied for the chute of scraper conveyor

In order to overcome the wear-resistant problem with the chute of scraper conveyor,the impact wear proper- ties of hot rolling medium manganese steel and martensite steel were investigated in this study. In addition,the self- strengthening wear mechanisms were analyzed and the application of medium manganese wear-resistant steel was intro- duced in the chute of scraper conveyor in coal mines. The results show that the medium manganese steel reveals a bet- ter wear resistance to impact wear properties compared with the martensite steel. Approximately 1 000 μm hardened layer in thickness is formed in worn subsurface. The highest vickers hardness is about 531HV. And the highest rock- well hardness is about 52HRC,showing an excellent wear resistance strengthen effect. Wear resistant strengthening mechanism varies with the impact energy. The strengthening mechanisms at a lower impact energy are controlled by the martensitic transformation,dislocation and stacking fault composite reinforcement. But at a high impact energy,the martensitic transformation,dislocation and deformation twins composite strengthening are the main mechanisms. The application of scraper conveyor shows that the wear resistance of new type hot rolling medium manganese steel is better than that of Hardox450 martensite steel,which can effectively reduce the wear of the chute and improve the service life of scraper conveyor.