Abstract
In the previous report, the authors described the effect of carbon and mangan on 6% Cr-Mn-W steel punching dies. In the present investigation, the authors studied the effect of Cr 5∼11%, W 0∼6% and Ni 0∼1.5% on standard composition containing C 1.5%, Mn 1.0%, Cr 6%, W 3%. The method of experiments are the same as in the previous investigation. The results of their experiments are summarised as follows: (1) The properties of self hardening decrease as the Cr and W contents increase, but increase as the Ni content increases. (2) The quenching temperature necessary for the maximum hardness is raised as the Cr and W contents increase and lowered as the Ni content increases. (3) The rate of deformation is influenced by the quenching and tempering temperature, and the most desirable contents of these elements are as follows: Cr 6∼8%, W 1.5∼2.0%, Ni 0∼0.6%.
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