COATING LAYER OF HOT AND WARM FORGING DIES AND METHOD FOR SURFACE TREATMENT OF HOT AND WARM FORGING DIES

摘要

The present invention relates to a coating method for a hot forging die and a method for surface treatment of a hot forging die, the method comprising: forming a nitride film on a surface of a forging die; And a zirconium nitride film formed on the surface of the nitride film, wherein the zirconium nitride film is polycrystallized. According to the present invention, by further coating a polycrystalline zirconium nitride film having an optimum crystal orientation on the nitride film, the Young's modulus to hardness can be remarkably lowered, and thus, there is an advantage of excellent restoring force.