AUTEMPERD DUCTILE CAST IRON COMPOSITION FOR CONNECTING ROD AND AND MANUFACTURING METHOD OF CONNECTING ROD USING THE SAME

摘要

A kind of matrix structure for using a cast iron composition of identical connecting rod and a connecting rod manufacturing method to be arranged to manufacture material enters bainite structure, by adding Mo, Ni, Yi Jitong, so as to improve machinability. One connecting rod manufacturing method includes a step of the cooling after casting cast iron composition. Cooling step includes cooling from 930 degrees Celsius to 300~400 degree Celsius with 30~50 degrees second speed Celsius, is maintained 10~30 minutes at 300~400 degrees Celsius, to the cooling of the normal temperature of 5~15 degrees Celsius/minimum speed. Cast iron composition includes C 2.8~3.8 weight %, Si 2.2~3.2 weight %, Mn 0.20~0.60 weight %, S 0.010~0.020 weight %, Ni 0.04~0.12 weight %, Mo 0.4~1.2 weight %, P 0.05 weight % or less, residual Fe and inevitable impurity.