Method for manufacturing high hardness and high toughness of hot-work tool steels

摘要

This method of manufacturing a hot tool steels are available to be used as a tool or mold for hot- tool. The method for producing a hot tool steel is by weight %,, C: 0.25 ~ 0.5%, Si: 0.2 ~ 1.5%, Mn: 0.2 ~ 1.5%, Cr: 2.5 ~ 9.5%, Ni: less than 2.5%, Mo: 0.3 ~ here include 2.5% and W: 5.0% or less and V: 1.5% 1 , or two or less , the steel billet in which the composition and balance of Fe and other unavoidable impurities in a range of 950 ~ 1150 austenite age ranging process , and then , 3 ~ 100 / min and then cooled at a rate of one to the tempering treatment in the range of 180 ~ 420 . ; The effect produced by the heat-treated material that has sufficient toughness at the same time to obtain a stable hardness for the target according to the present invention , improves the quality of the tool and the mold product made by hot tool steel and lower production costs there .