... years experience 1,Name: Carbon steel stamping part with black oxide coating;Carbon steel stamping part;Stamping part with balck oxide coating 2 ... do ?(1), Ability for the material of this kind of stamping part: Grade3.6,4.6,4.8,5.6,6 ... black oxide coating,hot dip galvanizing,etc Flame plating Light oil,spray coating,electrophoretic coating,etc Polishing Grinding and polishing,etc ...