"The O5-grade high-grade automobile sheet rolled by Sinosteel XTMMC not only has good shape and high stability, but also can satisfy our continuous production of domestic large-scale automobiles such as SAIC, Zhonghengtian and Zotye. The need for enterprise supply has really brought us a 'gold baby' to make money!" Recently, the person in charge of the 2180 cold-rolled sheet production line of the Cold Rolling Plant of Handan Iron and Steel Group Hanbao Iron and Steel Co., Ltd. Introduced that the rolls (hereinafter referred to as high-precision cold rolls) have successfully solved many problems such as high-quality automotive outer panels, difficult to control ultra-high-strength plate shape, and low production stability. The roll grinding compliance rate is over 98%. The failure rate of automobile panels dropped by 87%, and the annual profit can be more than 38 million yuan.

At present, the production technology level of high-grade automobile outer panels and high-strength steel represents the technical level of the steel manufacturing industry. With the continuous innovation of our country's steel rolling technology, cold-rolled sheets are gradually developing towards thin sheets, high strength and high precision. High-strength automobile outer sheets and high-strength steel have become one of the few profitable "gold babies" in the steel industry. However, ordinary cold rolls cannot better meet the comprehensive performance requirements of high-quality automotive sheets for rolls such as wear resistance, roughness retention, contact fatigue, dimensional stability and uniformity. Therefore, the development of high-precision cold rolls is the key to improving the rolling quality of high-grade automotive outer sheets and high-strength automotive steels.

Sinosteel XTMMC, as a world leader in the roll industry and a "national team" participating in global competition, thoroughly implements the new development concept, adheres to the "four aspects", and actively plays the role of the main body of scientific and technological innovation, relies on "3C" national roll scientific research platform of the National Roll Research Institute, the National Enterprise Technology Center, and the National Key Laboratory of Roll Composite Materials Center. In 2010, aiming at the problems of surface quality and rolling efficiency in the rolling process of automobile outer plate and high-strength automobile steel, the company independently developed high-precision cold rolls and their key application technologies, and studied the whole process of wear, spalling and roughness changes during the use process, and fully promoted and used in the production line of Handan Iron and Steel Hanbao 2180 cold-rolled sheet.

The roll has excellent accident resistance, good hardenability, good wear resistance and other basic properties; the hardness retention ability and roughness retention ability of the working layer are respectively 50% higher than those of conventional Cr5 forged steel rolls, and the wear resistance is improved by more than 30%. The physical quality, main technical indicators and use effects of rolls have reached the international leading level, and successfully filled the technological gaps of the domestic large-scale deep quenching layer high-hardness cold-rolled work roll manufacturing technology, high-quality cold-rolled automobile outer plate and high-strength automobile steel high-efficiency rolling, having played a positive role in promoting the production of domestic high-grade cold-rolled strips and improving the supply capacity.