Bearing steel for automobile wheel hub and manufacturing method thereof

摘要

Bearing steel for automobile wheel hubs and a method for producing the same, the chemical weight percentage of which is carbon: 0.58 to 0.61%; Silicon: 0.15%; Manganese: 0.87-0.95%; Copper: 0.10-0.25%; Molybdenum: 0.12 to 0.18%; Chromium: 0.10 to 0.20%; Sulfur: 0.015%; Phosphorus: ≦ 0.015%; Aluminum: 0.008% to 0.015%; Oxygen: 0.0006%; Nitrogen: 0.006-0.015%; Hydrogen: 0.0001%; Titanium: ≦ 0.0015%; The remainder is iron and inevitable impurities, and also satisfies C% + Mn% / 3 = 0.87-0.95 and Al / N = 0.85-1.15 simultaneously. Bearing steel of the present invention is characterized by corrosion resistance, fine grain, high purity, excellent toughness performance and the like. The tensile strength of the bearing steel is 800 ~ 900MPa, the hardness of the high frequency quenching raceway surface is 730 ~ 780HV, and the quenched hardening layer depth of the raceway surface can be guaranteed to reach 2.0 ~ 3.5 mm.