... #, 45#, forge alloy steel (42GrMo,38GrMoAI), heating treatment and mechanical processing, hardness is HRC55~58.2.Inner structure: single ... -layer, multi-layer screw, Z and other structure.3.Processing: Hard Chrome plating (Dupont formula), ... the same time, we provides turning, grinding, dynamic and static balancing for the surrounding enterprise. Shanghai Donghui Roller is the ...