... 45#, forge alloy steel (42GrMo,38GrMoAI), heating treatment and mechanical processing, hardness is HRC55~58. Advanced heat treatment process of quenching ... structure: single-layer, multi-layer screw, Z and other structure.Processing: Chroming, Ceramic, Hard Chrome plating (Dupont formula), chrommantel compact, ... -2,750*6000mm,for hot fabric,3D pattern,laser engraving,made by Shanghai Donghui Roller