New segregation free iron based powder with wax lubricant, KIP CLEANMIX~? (KWAX-B), was developed to improve the flowability and suppress the adhesion of lubricant to the inner parts of tube conveyer during transportation. The flow rate of CLEANMIX (KWAX-B) was lower by 0.5 s/100 g than that of the conventional segregation free iron based powder with wax lubricant, CLEANMIX (KWAX-A) and the index of flow blocking was smaller by 62 percent. Lubricant was hardly adhered to the inner parts of screw conveyer during transportation of CLEANMIX (KWAX-B). On the other hand, lubricant was adhered during transportation of the conventional segregation free iron based powder with wax lubricant. The powder characteristics, such as compressibility, Rattler value and ejection force of CLEANMIX (KWAXL B), and the mechanical properties, such as tensile strength, Charpy impact value and dimensional change of sintered steel made of it, were almost equal to those in the case of the conventional segregation free iron based powder with wax lubricant.
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