Hot die steel, used for large solid dies in drop forging, should neces

1.	Hot die steel, used for large solid dies in drop forging, should necessarily have
A.	high strength and high copper content
B.	high hardness and low harden ability
C.	high toughness and low thermal conductivity
D.	high hardness and high thermal conductivity
Answer» D. high hardness and high thermal conductivity

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Hot die steel, used for large solid dies in drop forging, should necessarily have

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