High carbon chromium bearing steel, and preparation method thereof

摘要

Provided is bearing steel having excellent fatigue life by minimizing segregation during casting of the bearing steel and reducing the generation of large carbides in a segregation band. The high-carbon chromium bearing steel includes 0.5 wt % to 1.2 wt % of carbon (C), 0.15 wt % to 2.0 wt % of silicon (Si), 0.05 wt % to 0.45 wt % of manganese (Mn), 0.025 wt % or less (excluding 0 wt %) of phosphorus (P), 0.025 wt % or less (excluding 0 wt %) of sulfur (S), 0.1 wt % to 1.6 wt % of chromium (Cr), 0.01 wt % to 0.3 wt % of Ce, and iron (Fe) as well as other unavoidable impurities as a remainder. A method of manufacturing the steel is also provided.

主权项

1. High-carbon chromium bearing steel comprising:
1.0 wt % to 1.2 wt % of carbon (C); 0.15 wt % to 0.24 wt % of silicon (Si); 0.05 wt % to 0.24 wt % of manganese (Mn); 0.025 wt % or less (excluding 0 wt %) of phosphorus (P); 0.025 wt % or less (excluding 0 wt %) of sulfur (S); 0.1 wt % to 1.6 wt % of chromium (Cr); 0.01 wt % to 0.3 wt % of cerium (Ce); and iron (Fe) as well as other unavoidable impurities as a remainder, and a Ce compound as an inoculant, the Ce compound being distributed at a number concentration ranging from 5/mm2 to 200/mm2.