4Cr13 steel, a martensite stainless steel, has a high hardenability, good polishing properties, excellent resistance to corrosion and hot oxidation [1]. Due to these excellent properties, 4Cr13 stainless steel can be applied in several important fields, such as precision mechanism, structural automotive application, and petrochemical industry. During the manufacturing process, the heat treatment has a significant effect on the mechanical properties of 4Cr13 components. The strength and hardness of 4Cr13 components could remarkably increase after quenching and tempering.