Method for manufacturing high-carbon bearing steel and high-carbon bearing steel manufactured therefrom
Disclosed is a method for manufacturing high-carbon bearing steel, which include: heating a billet at a temperature of about 950 to 1,050° C. for about 70 to 120 minutes, rolling the billet to manufacture a wire rod, winding the wire rod to manufacture a wire rod coil, cooling the wire rod coil, and subsequently heat treating the wire rod coil for spheroidizing and carbonitriding, respectively. The bearing steel may include an amount of about 0.9 to 1.3 wt % of carbon (C), an amount of about 1.1 to 1.6 wt % of silicon (Si), an amount of about 1.0 to 1.5 wt % of manganese (Mn), an amount of about 1.5 to 1.9 wt % of chromium (Cr), an amount of about 0.2 to 0.6 wt % of nickel (Ni), an amount of about 0.1 to 0.3 wt % of molybdenum (Mo), and the balance iron (Fe) based on the total weight thereof.
1. A bearing steel comprising:
an amount of about 0.9 to 1.3 wt % of carbon (C),
an amount of about 1.1 to 1.6 wt % of silicon (Si),
an amount of about 1.0 to 1.5 wt % of manganese (Mn),
an amount of about 1.5 to 1.9 wt % of chromium (Cr),
an amount of about 0.2 to 0.6 wt % of nickel (Ni),
an amount of about 0.1 to 0.3 wt % of molybdenum (Mo), and
the balance iron (Fe),
all the wt % based on the total weight of the bearing steel,
wherein the bearing steel comprises a carbide having a size of about 6.8 to 11.6 μm,
wherein a fraction of the carbide is about 12 to 16%.
2. The bearing steel of claim 1 , wherein a surface hardness of the bearing steel is about 800 to 873 HV.
3. The bearing steel of claim 1 , further comprising one or more: an amount of about 0.05 wt % or less of aluminum (Al), an amount of about 0.25 wt % or less of copper (Cu), an amount of about 0.03 wt % or less of phosphorus (P), an amount of about 0.01 wt % or less of sulfur (S), an amount of about 0.01 wt % or less of nitrogen (N), and an amount of about 0.0008 wt % or less of oxygen (O), based on the total weight of the bearing steel.