Carburizing bearing steel and preparation method thereof

US11473162B2 · kind B2 · utility

Assignee

• CENTRAL IRON AND STEEL RESEARCH INSTITUTE · CN

Inventors

• Wenquan CAO · Beijing, CN
• Feng Yu · Zhejiang, CN
• Cunyu WANG · Beijing, CN
• Haifeng Xu · San Diego, US
• Hui Wang · Meekrap-oord, CN
• Da Xu · Burnaby, CA
• Yuqing WENG · Beijing, CN

Key dates

• Filing date: Feb 26, 2021
• Grant date: Oct 18, 2022
• Expiry date: Mar 25, 2041

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/25
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a carburizing bearing steel and a preparation method thereof. The carburizing bearing steel of the invention comprises: 0.18˜0.24 wt % of C, 0.4˜0.6 wt % of Cr, 0.20˜0.40 wt % of Si, 0.40˜0.70 wt % of Mn, 1.6˜2.2 wt % of Ni, 0.15˜0.35 wt % of Mo, 0.001˜0.01 wt % of S, 0.001˜0.015 wt % of P, 0˜0.20 wt % of Nb, 0˜0.20 wt % of V and the remaining is iron, wherein the contents of Nb and V are not 0 at the same time. In the invention, an appropriate amount of Nb and V is added in combination with other elements so as to refine the grain size, inhibit the generation of large granular carbides in the steel during carburization and improve the uniformity of the microstructure of steel materials, thus further enhancing the contact fatigue life of the carburizing bearing steel.