... experience 1,Name: Carbon steel stamping part with black oxide coating;Carbon steel stamping part;Stamping part with balck oxide coating ... 2,For the similar stamping part,what can we ... ?(1), Ability for the material of this kind of stamping part: Grade3.6,4.6,4.8,5.6, ... 6.8,8.8,9.8,10.9,12.9,etcCarbon steelGr.B,Gr.C,Gr.D,Gr ...