Abstract: The high-strength wear-resisting steel HNM450 to meet the complex working conditions of the coal mill has been  developed.  Its  tensile  strength  is  1727  MPa,elongation  after  fracture  is  14.5%,average  HBW  hardness  number  is 522,and  impact  energy  at  -20℃  is  38J,it  has  good  strength,plasticity  and  low  temperature  toughness.The  comparative test results of corrosion and wear simulating the actual working condition of the coal mill show that the corrosion and wear resistance  of HNM450 products  at 200  ℃ high temperature,pH=5  in the weak  acidic humid  environment  and  at 200  ℃  high  temperature,pH=9  in  the  weak  alkaline  humid  environment  is  obviously  better  than  that  of  HARDOX450  steel.  HNM450  steel has been used in the manufacture of coal mills for downstream users,realized the domestic  substitution of imported HARDOX450 steel.

摘要： 研发了满足磨煤机复杂服役工况的高强度耐磨钢HNM450。其抗拉强度1727 MPa，断后伸长率14.5%，平均HBW硬度值522，-20 ℃冲击功38 J，具有良好的强度、塑性和低温韧性。模拟磨煤机实际服役工况的腐蚀磨损对比试验结果显示：HNM450产品200 ℃高温pH=5的弱酸性潮湿环境和200 ℃高温，pH=9的弱碱性潮湿环境下的耐腐蚀耐磨性能均明显优于HARDOX450钢。HNM450钢已经用于下游用户磨煤机的制造，实现了对进口耐磨钢HARDOX450的国产化替代。