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.