Non-normalized steel composition and connecting rod using the same, and method of manufacturing the connecting rod

A connecting rod, which is manufactured by using a non-normalized steel composition comprising:

• carbon (C) in an amount of about 0.30 to 0.55 weight %,
• silicon (Si) in an amount of about 0.80 to 1.20 weight %,
• manganese (Mn) in an amount of about 0.80 to 1.20 weight %,
• sulfur (S) in an amount of about 0.06 to 0.10 weight %,
• vanadium (V) in an amount of about 0.20 to 0.35 weight %,
• titanium (Ti) in an amount greater than 0.01 weight % and less than or of about 0.20 weight %,
• nitrogen (N) in an amount of about 0.005 to 0.02 weight %, and
• the remainder of iron (Fe), and inevitable impurities,
• based on a total weight of the steel composition,
• wherein the connecting rod comprises:
• a shank part including a bainite structure;
• a large end including a mixed structure of ferrite and pearlite;
• and
• a small end including a mixed structure of ferrite and pearlite, and
• wherein the large end and the small end have a greater thickness than the shank part;
• and
• the connecting rod has a yield strength of 857 MPa or greater.