... seal rings 2.high hardness,high polishing 3.material:WC-Co,WC-Ni,WC-Ni/Co,WC-TiC-Ni/Cr 4.long service time Cemented carbide ... sealing rings or prats.Our material covers: WC-Co alloy, WC-Ni alloy, WC-Ni/Co alloy, WC-TiC-Ni/Cr alloy etc.Carbide Standard GradesCobalt ...