(1) The fracture surface consisted of cleavage terrace with tore edge, dimple and river pattern. The failure mode of 4Cr13 component was the quasi-cleavage fracture.
(2) Compared with the standard sample, the substandard sample exhibited a high hardness, which could cause the strong rigidity, but resulting in the less toughness.
(3) The heat treatment process and other manufacturing processes has a significant effect on the microstructure and mechanical properties of the samples. With increasing the tempering temperature, the hardness of the component was decreased when the quenching temperature was kept stable.