Mass production is mainly used in the punch or die mold materials?① alloy tool steel (STD 11)② steel (SM 15C)③ high speed steel (SKH 57)④ carbon steel (SM 55C)
Mold material is mainly used to punch or die for mass production? ① alloy tool steel (STD 11) ② mild steel (SM 15C) ③ high speed steel (SKH 57) ④ steel (SM 55C)
the mass production of the punch and die is mainly used to mold the material.① alloy tool steel (STD 11)② mild steel (SM 15C)high speed steel (SKH ③ 57)④ carbon steel (SM 55C)