Powder metallurgy is a process for making metals or using metal powders (or a mixture of metal powders and non-metal powders) as raw materials, forming and sintering, and manufacturing metal materials, composite materials and various types of products.
blackening or black coating metallurgy machinery parts
Fe, Cu, FeCu alloy, stainliee steel, graphite
Sleeve, Flanged,Spherical,Miniature,Trust Washer, Rod
1) inner 3-70mm, also can according to your req...