The Aim of this study is to determine the effectiveness of wear resistance and friction characteristics in Cr-C steel. To find wear resistant and friction with inner elbow pipe, it is needed hardness and frictional condition test to be capable of supplying with high Cr-C steel. The result of HTV(heat treatment in vacuum) shows that hardness increased with increasing Cr content in % carbide phase. After the HTV, hardness could improve by 7∼10% in Vickers hardness test and by 8∼20% in Rockwell hardness test, respectively. This behaviour of the hardness of Cr casting steel was explained by the types of chemical bonds that hold atoms together in Cr carbide phase. Through the friction coefficient and wear loss test, the increase of Cr wt% could reduce in the coefficient of friction and wear loss. The results obtained with Archard’s formula are not only dynamic calibration curve of friction coefficient and specific wear coefficient Kad but also the relation of hardness, friction coefficient and specific wear coefficient Kad.