... and other machinery accessories, hardware too, straight shank twist drill are hot rolling. The round steel with diameter 16mm can ... products annealing, stretch, expanding.3.Heat treatmentHardening, Annealing, Tempering for Surface, inner bore, local, integral of All kinds of ... 4.Welding, Welding head, lathe tool, reamer, milling cutter, drill bits, and stainless steel bottom of the pot, such as the ...