Technological process

Internal surface polishing treatment: # 320 to # 400 linear polishing treatment, pickling treatment, Electropolishing treatment, internal surface roughness 0.4um mirror surface external surface polishing treatment: # 320 to # 400 feather cloth polishing treatment # 180 cloud surface polishing treatment; Acid washing treatment; Sandblasting treatment, with an external surface roughness of 0.4um.