... high filling rate 1,Material of bucket:16Mn abrasion resistant plate.2,Filling rate of the bucket:75%-90%(Confirmed by ... plant with advanced heat treatment technology1,Inside and outside chain plate:40Cr . 2,Pin shaft :20CrMnMo . 3,Sleeve :20CrMo . 4,Roller ... the lengthening of the pitch. 3,External chain plate is punched into bending plate structure. And it is convenient to fix the ...