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

Patent metadata

Field	Value
Publication number	US-10704126-B2
Application number	US-201414556172-A
Country	US
Kind code	B2
Filing date	Nov 30, 2014
Priority date	Feb 17, 2014
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

Disclosed are a non-normalized steel composition which includes carbon (C), silicon (Si), manganese (Mn), sulfur (S), vanadium (V), titanium (Ti), nitrogen (N), and iron (Fe), and a method of manufacturing the connecting rod for improving yield strength, fatigue strength, and the like of the connecting rod. The non-normalized steel composition includes 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 of about 0.01 to 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 composition.

First claim

What is claimed is:

1. 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.

2. The connecting rod of claim 1 , wherein the non-normalized steel composition further comprises:
chromium (Cr) in an amount of about 0.2 weight % or less, based on a total weight of the steel composition.

3. The connecting rod of claim 1 , wherein the non-normalized steel composition further comprises:
phosphorus (P) in an amount of about 0.03 weight %, copper (Cu) in an amount of about 0.21 weight %, nickel (Ni) in an amount of about 0.07 weight %, molybdenum (Mo) in an amount of about 0.008 weight %, and aluminum (Al) in an amount of about 0.008 weight %, based on a total weight of the steel composition.

4. The connecting rod of claim 1 , wherein the non-normalized steel composition consists essentially of:
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.

5. The connecting rod of claim 1 , wherein the non-normalized steel composition consists essentially of:
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 %, chromium (Cr) in an amount of about 0.2 weight % or less, and the remainder of iron (Fe), and inevitable impurities, based on a total weight of the steel composition.

6. The connecting rod of claim 1 , wherein the non-normalized steel composition consists essentially of:
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 %, chromium (Cr) in an amount of about 0.2 weight % or less, phosphorus (P) in an amount of about 0.03 weight %, copper (Cu) in an amount of about 0.21 weight %, nickel (Ni) in an amount of about 0.07 weight %, molybdenum (Mo) in an amount of about 0.008 weight %, aluminum (Al) in an amount of about 0.008 weight %; and the remainder of iron (Fe), and inevitable impurities, based on a total weight of the steel composition.

7. The connecting rod of claim 1 , wherein the connecting rod has a yield strength of greater than 1000 MPa.

8. The connecting rod of claim 1 , wherein the titanium (Ti) is present in an amount of 0.04 weight % or greater and less than or of about 0.20 weight %, based on a total weight of the steel composition.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Park Jae-Bong
• Lee Chang-Ku

Classifications

• C21D8/00

  Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02) · CPC title

• C21D2221/00

  Treating localised areas of an article · CPC title

• C21D7/13

  by hot working · CPC title

• F16C7/023

  for piston engines, pumps or the like · CPC title

• C21D7/10

  of the whole cross-section, e.g. of concrete reinforcing bars · CPC title