On June 24, the global launch ceremony for the ultra-thin wide cold-rolled Invar steel product (0.1 mm × 1500 mm) was successfully held at Baoshan Iron & Steel Co., Ltd. (Baosteel). YSU Vice President Wang Desong was invited to lead a delegation to attend the ceremony. Wang, together with Shen Kanyi, Assistant to the General Manager of Baosteel, General Manager of Baoshan Base, and General Manager of the Silicon Steel Business Unit, Liu Xiao, Deputy Director of Central Iron & Steel Research Institute, and other leaders and experts, witnessed the major breakthrough in China’s metal materials for high-end displays sector.
Global Launch Ceremony of the 0.1 mm × 1500 mm Ultra-Thin Invar Alloy Product
The Invar steel product is the world's first ultra-thin Invar alloy strip with an extreme width-to-thickness ratio of 15,000:1 (1500 mm × 0.1 mm), jointly developed by YSU, China Iron & Steel Research Institute Group Co., Ltd. (CISRI), and Baosteel. Based on the results of mass production validation by downstream enterprises, its performance has fully met world-leading standards.
At the ceremony, Wang congratulated the successful rollout of the product in his speech. He stated that YSU, CISRI, and Baosteel have long collaborated on steel materials technology. Through collaborative efforts spanning composition design, process optimization, and performance testing, they ultimately achieved a technological breakthrough in Invar strips with extreme width-to-thickness ratio. This achievement stands as a model of the deep industry-education-research integration and collaborative innovation between universities and enterprises. YSU will collaborate with Baosteel and CISRI to combine strengths in addressing key national and industrial needs. Comprehensive, deep-level and high-quality cooperation will be carried out in scientific research, results commercialization, talent cultivation, and international exchange, thereby promoting the high-quality development of China's steel industry.
China Metallurgical News features this breakthrough as its front-page headline
Invar alloy's ultra-low thermal expansion coefficient makes it an irreplaceable material for high-precision display panel. Previously, China's photomask industry faced exorbitant costs due to foreign technology monopolies. Professor Bai Zhenhua's team has collaborated closely with teams from CISRI and Baosteel, combining theory and practice to jointly achieve breakthroughs in key technologies such as ultra-wide strip rolling stress control and semiconductor-grade refining. These achievements have helped tackle a series of world-class challenges including uneven stress distribution and edge cracking in the rolling of 1500 mm ultra-wide strips. As a result, China has become the only country in the world to master the full-process manufacturing of 1500 mm ultra-thin Invar alloy strips. This landmark achievement injects YSU's momentum into advancing national strategic goals and regional economic development.
Leaders and experts, including Qi Yan, Director of the Functional Materials Institute of Central Iron & Steel Research Institute, Lu Yong, General Manager of Baosteel Cold Rolling Plant, Jiang Lei, Deputy General Manager of Baosteel Cold Rolling Plant, Bai Zhenhua, Executive Vice President of Shenzhen Research Institute of Yanshan University, and Wang Peng, Deputy Director of the Technology Industry Promotion Center of YSU, attended the event.
