... mm,forged 4..Smelting characteristic:(1)high hardenability, high toughness, good ductility, high temperature performance.(2)The use of Electric arc ... furnace (EAF)+ refining(LF)+ Vacuum(VD)make theproduction of die steel are in high ... hardness--good resistance to heat, good hot toughness, high resistance to temperature fatigue and wear in medium ...