The common tap materials include high-speed steel, cobalt-containing high-speed steel, powder metallurgy high-speed steel, and cemented carbide.
HSS：M2
HSSE：M35（5%Co）, M42(8%Co)
HSSE-PM: ASP2030 , ASP2052
WC (Tungsten Carbide / HM) : WC:90 | Co:10 | Grain:0.5-0.8
