Carbon steel stamping part with black oxide coating Machined and stamping SGS audited More than 20 years experience 1,Name: Carbon steel stamping part with black oxide ... coating;Carbon steel stamping part;Stamping part with balck oxide coating 2,For ... ,9.8,10.9,12.9,etcCarbon steelGr.B,Gr.C,Gr.D,Gr.36,Gr.58,1010,1015,1016,1020 ...