刮板输送机中板的严重磨料磨损造成了运输效率降低、维修费用增加等问题，同时也影响着煤矿的生产安全。对新研制的拟用于刮板输送机中板的新型不同Ti含量低合金耐磨钢Ti20与Ti60的组织、相结构进行了研究，并在橡胶轮干砂磨粒磨损试验机上进行了石英砂和煤砂混合两种磨料的磨料磨损试验，并与常用于刮板输送机中板的马氏体耐磨钢Hardox450做了对比研究。新型耐磨钢Ti20和Ti60的含Ti量分别为0.2％和0.6％，铸造后轧制成板，热处理工艺为900  ℃淬火后200  ℃回火。研究结果表明:Ti20与Ti60的组织为板条马氏体。随着Ti含量的增加，耐磨钢的原奥氏体晶粒度减小，马氏体板条长度也减小。Ti与C在原奥氏体晶界处原位生成了尺寸为1~5 μm的不规则TiC颗粒，TiC颗粒起到了钉扎晶界、细化晶粒的作用。在石英砂和煤砂混合两种磨料的磨损实验中，由于煤砂混合磨料主要成分煤粉的硬度远低于石英砂，颗粒较为圆钝，因此，耐磨钢在石英砂磨料的微犁削沟槽深度和宽度远大于煤砂混合磨料的磨损。无论在石英砂还是在煤砂混合的磨损条件下，耐磨钢的磨损失重都随着Ti的增加而降低。加Ti的新型耐磨钢的耐磨性可达Hardox450的1.3倍。耐磨钢的磨损机制主要为微切削和微犁沟。随着Ti含量的增加，Ti元素集中区域较为光滑，犁沟受到阻碍，犁沟和切削槽深度变浅。原位生成的TiC颗粒起到了局部强化作用，增强了周围区域的硬度和对磨料的阻碍作用，提高了新型耐磨钢的耐磨料磨损性能。

The middle plates of scraper conveyors used in coal mines suffer heavy abrasive wear,which decreases the transportation efficiency and increases the maintenance costs,as well as affect the safe production of coal mines. The microstructures,phase structures and abrasive wear properties of Ti20 and Ti60 low alloy wear resistant steels with dif- ferent Ti content,which are newly developed for the scraper conveyor plates,are studied. The abrasive wear tests were conducted by a rubber wheel dry sand abrasive wear tester respectively using quartz sand as well as a mixed abrasive of coal and sand. Martensitic wear-resistant steel Hardox 450,commonly used in the middle plates of scraper convey-ors,was used as a comparing steel. The Ti20 and Ti60 steels,whose Ti content is 0. 2% and 0. 6% respectively,were rolled into a plate after casting. The rolled plates were quenched at 900 ℃ then tempered at 200 ℃ . The results show that the microstructure of both Ti20 and Ti60 steels is lath martensite. With the increase of Ti content,the original aus- tenite grain size of the wear-resistant steels decreases,and the length of martensitic lath also decreases. A little of irreg- ular shape TiC particles with a size of 1-5 μm were in-situ precipitated at the original austenitic grain boundary. The TiC particles play the roles of pinning grain boundary and refining grains. In the wear tests respectively using quartz sand and a mixed abrasive of coal and quartz sand,the hardness of coal particles is much lower than that of quartz sand,and the coal particles are more round and blunt,so that the micro-cutting and micro-plowing grooves abraded by the quartz sand present much wider and deeper than by the mixed abrasive. Whether in the quartz sand or in the mixed abrasive coal wear tests,the wear weight loss of the new wear resistant steels decreases with the Ti content. Their wear resistance can reach up 1. 3 times,comparing with Hardox 450. The wear mechanisms of wear-resistant steel are main- ly micro-cutting and micro-plowing. As the Ti content increases,the furrow and the cutting grooves become shallower. The worn surface looks smoother and the furrow is obstructed at the Ti element concentration zones. The TiC particles play a role of local strengthening in their surrounding area,that is,they enhance the hardness and impede the micro- cutting of the abrasives,so the wear resistance of the new wear resistant steels is improved.