TEMPERING METHOD OF STEEL, DIE STEEL AND METHOD FOR MANUFACTURING THE DIE STEEL USING THE TEMPERING METHOD

摘要

Disclosed is a tempering method of steel, a mold steel using the same, and a method of manufacturing the same, which can predict hardness after tempering of a steel for a mold and can also predict tempering conditions having a target hardness in manufacturing a steel for a mold. Tempering method of the steel according to the present invention is characterized in that the tempering (Tempering) the steel, it is characterized by adjusting the tempering holding temperature and holding time to have a Rockwell hardness after tempering according to the following equation (1) and (2). [Equation 1] X ₁ = T (20 + Log ₁₀ t) / 1000 " (2) " H = -1.6397 X ₁ + 56.455 (X ₁ 17) H = -4.9419 X ₁ + 114.79 (X ₁ ≥ 17) (T is the tempering holding temperature (K), t is the tempering holding time (hour), H is the Rockwell hardness (HRC) after tempering)