HOT WORK DIE STEEL, HEAT TREATMENT METHOD THEREOF AND HOT WORK DIE

摘要

The present invention relates to a hot-working die steel, a heat treatment method thereof and a hot-working die. Specifically, the present invention discloses a hot-working die steel, its alloying composition comprises, by weight percentage, Cu: 2~8%, Ni: 0.8~6%, and Ni:Cu ≥ 0.4, C: 0~0.2%, Mo: 0~3%, W: 0~3%, Nb: 0~0.2%, Mn: 0~0.8%, Cr: 0~1%, the balance of Fe and other alloying elements and impurities. The present invention also discloses a heat treatment method for performing on the hot-working die steel. The present invention further discloses a hot-working die formed of the hot-working die steel underwent through heat treatment according to the heat treatment method.