1984 Volume 70 Issue 11 Pages 1598-1604
As the increase of switchover from carburizing to induction hardening, hardenability control of shallow hardening steels for induction hardening has become to be important. This paper introduces newly developed control techniques for such steels comparing with conventional methods.
As for alloy steels, Jominy (end quenched) hardness at a particular distance has been required to be controlled within a small range in order to maintain the strength and to minimize the quench-distortion. The control methods for such a requirement is noted to have reached to a considerably high level. On the contrary, hardening depth is required to be controlled in the case of induction hardening. Therefore, the authors have established new technical methods for controlling Jominy distance specified at a particular hardness level. Basically two developments are included in this control system. The one is a computerized prediction of whole Jominy curves from chemical compositions of molten steel and the other is a new steelmaking process consisted of EF (Electric Arc Furnace Melting)+LF (Ladle Furnace Refining)+RH (RH Vacuum Degassing)+CC (Continuous Casting).