BaoSteel announced that Masteel Rail Transit Materials Technology Company Limited successfully passed the TPG certification for its wheel and axle heat treating process, becoming China's first wheel and axle enterprise to pass this certification. After more than half a year of efficient collaboration, Masteel Rail Transit Materials Technology Company Limited passed the strict on-site audit by PRI (Quality Review Institute International) and successfully obtained the first TPG certificate for the wheel and axle heat-treating process in China. The heat-treating process is a critical process that determines the performance of wheel and axle products. In recent years, to ensure the qualification of suppliers, American customers require that the heat-treating process of wheel and axle products must be certified by TPG (Transportation and Energy) in the United States. TPG certification, known for its very strict requirements, is very different from China's domestic standard system. The authority of TPG has been internationally recognized and is generally applied to the standard of aerospace parts.