For heating T of the die material is valid where the thermal diffusivity of the die material is exercised by deciding method. The stress of the die material by heating from the die casting liquid metal depends mainly on physical properties of the die material when the value of the calculated stress does not exceed the yield point. Also derived with help of dislocations write the die life till the origin of cracks in cycles eventually the share of this die life on total die life in dependence on mechanical and physical properties of the die material and well explain increasing die life at higher thermal diffusivity of the die material as also at heat treatment of the same die material on the lower strength. The derived relation for the spreading cracks length in dependence on number of cycles agrees with the results of the transferred tests.
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