The fracture splitting properties of forged slab of microalloying steel F38MnVS (/% : 0.37C
1.32Mn
0.18Si
0.008P
0.060S
0.12Cr
0.12V) for traditional connecting rod and the fracture splitting properties of forged slab of microalloying steel C70S6 (/% : 0.72C
0.57Mn
0.32Si
0.020P
0.060S
0.17Cr
0.03 V) for fracture splitting connecting rod have been compared and studied. Results indicate that the fracture splitting properties of steel C70S6 are obviously better than that of steel F38MnVS. The main structure of steel C70S6 is lamellar pearlite with a little ferrite
and the splitting section is mainly brittle fracture to meet the requirement of fracture splitting technology.