Recent research led by Li Weitao and his team from Weifang Special Steel Group Co., Ltd. and the University of Science and Technology Beijing has shed light on the intricate characteristics and evolution of non-metallic inclusions in GCr15 bearing steel, a material critical for various applications in the construction sector. Published in ‘Teshugang’, this study is poised to significantly influence the quality of steel produced, which is vital for the durability and reliability of construction projects.
The research meticulously analyzed the non-metallic inclusions throughout the production process, which involves multiple stages, including basic oxygen furnace (BOF), ladle refining (LF), vacuum degassing (VD), and continuous casting (CC). The findings reveal that during the ladle refining stage, the predominant inclusions are MgO-Al2O3 and Al2O3, which transform into CaO-MgO-Al2O3 and CaO-Al2O3 by the end of this stage. This transformation is crucial as it directly impacts the final properties of the steel.
Li Weitao emphasized the importance of controlling these inclusions, stating, “Reducing inclusion density not only enhances the mechanical properties of the steel but also extends its service life in demanding applications.” The study reported a significant reduction in inclusion density from 16.53 to 14.02 pcs/mm² after the VD soft blowing process, indicating an inclusion removal rate of approximately 15.2%. Such improvements can lead to enhanced performance of components made from GCr15 bearing steel, which is widely used in high-load applications, including construction machinery, automotive parts, and heavy-duty bearings.
The research also highlights the thermodynamic calculations that explain the evolution of these inclusions. When the aluminum content in the molten steel is maintained at a specific level, it facilitates the formation of beneficial inclusion types. This careful management of chemical composition is essential for producing high-quality steel that meets the stringent demands of modern construction.
As the construction industry increasingly prioritizes materials that offer both strength and longevity, the implications of this research extend beyond mere academic interest. The ability to produce GCr15 bearing steel with fewer and more controlled non-metallic inclusions could revolutionize how construction materials are sourced and utilized, ultimately leading to safer and more sustainable building practices.
The findings from this study not only contribute to the body of knowledge in metallurgical engineering but also pave the way for future innovations in steel production techniques. As industries seek to enhance the performance of their materials, the insights gained from this research will likely guide the development of advanced steel alloys tailored for specific applications.
For more information about the affiliations of the lead authors, you can visit Weifang Special Steel Group Co., Ltd. and University of Science and Technology Beijing.
