The spheroidizing of pearlitic cementite below (LTC) refers to balling-up of the cementite (cm), utilized in the softening of tool steels and some of the air- hardening of alloy steel. In such case ,steel can be drawn and will machine freely may be according to the followings: * Fine globules improve the surface O finish and helps dissolving during heating for hardening. Refining of the structure by quenching is not essential. The formation of very large globules of cm is less probable. The layers of cm are coarse and do not take long time to break. Tearing of surface during machining is might be possible. The addition of any alloying elements to carbon steel reduce the eutectoid point toward the left of equilibrium diagram i.e.an alloy steel will be completely pearlitic, even it contains less than 0.8%C, the shifting of the eutectoid point can be related to one of the followings:Increase of solubility of the alloying elements in austenite . Carbon steel incorporate less carbon than alloy steel. Alloy steel incorporate less carbon than in carbon steel. O All The reduction of solubility of carbon of in austenite.