Abstract
The carbon steel, chromium steel, low nickel-chromium steel and mangan-chromium steel are widely used as the forging dies steel. The authors investigated the hardness due to various kinds of heat treatments and the moderate properties as the forging dies. As the results of this investigations, as far as the hardness, tensile strength, elongation, contraction of area, impact value at high temperature, and deformation due to heat treatment, and then the change of hardness due to repeated heating & cooling, the chromium steel is most excessive, and the low nickel-chromium steel and mangan-chromium steel are to be comparable to those of chromium steel by giving the initial sufficient hardness by proper heat treatment.
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