Assessment of wear resistance of crusher members

The relevance of increasing wear resistance of active members in rock crushers is governed by their wide use in the industry. The trends of the wear resistance increase include improvement of the design of the active crushing members, use of high wear resistant materials and application of hardening technologies. Laboratory testing of materials to be used to manufacture active members of crushers is most expedient when the working efficiency of the active members is achieved through their increased wear resistance. The lab-scale tests should ensure modeling of interaction between active crushing members and crushing products since their abrasivity and the contact conditions change in the course of crushing. Thus, it is necessary to create a plant capable to implement this condition. The plant designed for wear testing of materials actualizes the schemes of active surface–rock interaction in case of head-on impact and impact with friction. Applicability of the plant in testing active members of impact crushers is proved by the similarity of the wear mechanism in the test samples and in hammers when abrasivity of abrasive particles and crushed rock is the same. This study involved the comparative testing of series-produced alloys T-590, PP-AN170, PP-AN105 and experimental alloy 230H8F7S2G6 as study materials, and annealed steel 45 as a reference material. The highest wear resistance distinguishes alloy 230H8F7S2G6, owing to composite hardening of its structure and martensitic transformation of austenite in surface layers of the alloy as a result of impact action of an abrasive. It is recommended to use alloy 230H8F7S2G6 for the electroslag facing of active crushing members.