Recently, Bayi Steel's Q690D high-strength steel was successfully developed, and the first batch of steel plates was successfully put into trial use among users. This marks a major breakthrough in the development of high-strength steel for coal-fired machinery by Bayi Steel and also sounded the clarion call for Bayi Steel's new product development in 2025.
The Q460C, Q550D, and Q690D high-strength steels produced by Bayi Iron and Steel are mainly used to manufacture hydraulic supports for coal mining machines. Underground fully-mechanized mining in coal mines is a harsh working condition, and the performance requirements for high-strength coal mining machine steel are strict and must have high strength, high toughness, and good welding performance.
In recent years, to adapt to changes in market demand, Bayi Steel has accelerated the research and development of new products and increased the production of various steel varieties. Zhao Hu, the company's first-level expert, is the person in charge of Q550/Q690 development and leads the product development team to research TMCP high-strength steel production technology. In January 2023, after the upgrade and transformation of the medium and thick plate ACC and hot straightening machine, the composition and process were independently designed, the controlled rolling and controlled cooling process parameters were optimized, and the plate shape and performance problems were solved. The Q550D high-strength steel for coal mining machinery was successfully developed, forming a stable batch production capacity, and accumulating valuable experience for the production and development of Q690D. The successful trial production of Bayi Steel's high-strength coal mining machinery steel Q690D and its supply to users will play a good role in promoting Bayi Steel's expansion of the high-strength coal mining machinery steel market.
According to feedback from the staff of Bayi Steel’s Marketing Center, after the first batch of Q690D steel plates of Bayi Steel were put into trial use, they showed good mechanical properties and welding performance, marking that Bayi Steel’s research and development in the field of high-strength coal-fired machinery steel has reached a new level.
The successful development of Q690D high-strength steel is not only the success of a product, but also the important thing is that during the development process, the technical staff has greatly improved their understanding of the production technology of TMCP high-strength steel, and fundamentally clarified the technical principles and technical measures for the development of high-strength steel, which has laid a good foundation for the company to develop other new high-strength steel products. Next, the rolling mill will solidify the Q690D production process, and improve the production quality level and supply capacity. On the other hand, the new product development team will increase the development of high-performance steel varieties to help the company win the battle to turn losses into profits in 2025.