NON-NORMALIZED STEEL COMPOSITION WITH IMPROVED MATERIAL PROPERTIES AND THE CONNECTING ROD USING THE SAME AND METHOD FOR MANUFACTURING THE CONNECTING ROD

摘要

The present invention relates to a non-tempered steel composition containing carbon (C), silicon (Si), manganese (Mn), sulfur (S), vanadium (V), titanium (Ti), nitrogen (N) And more particularly, to a method of manufacturing a connecting rod including a connecting rod and a connecting rod manufactured using the same and a heat treatment technique for improving the yield strength and fatigue strength of the connecting rod. More specifically, (Si) of 0.80 to 1.20 wt%, manganese (Mn) of 0.80 to 1.20 wt%, sulfur (S) of 0.06 to 0.10 wt%, vanadium (V) of 0.20 to 0.35 wt%, titanium (Ti) And the balance of iron (Fe) and unavoidable impurities, the shank portion, which is a portion where the produced connecting rod is concentrated, has a bainite structure and a machinability of 0.001 to 0.02 wt% The large and small end portions required are formed of a mixed structure of pearlite structure and ferrite, so that yield strength and fatigue strength It relates to a vaginal composition and non-adjustable connecting rod and a method using the same that can improve.