On December 29, 2017, 'The main project of Hong Kong-Zhuhai-Macao Bridge across the board' has been selected by the People's Daily for the top 10 news items in China for 2017. The cross-sea bridge mentioned by President Xi Jinping in his 2018 New Year message, It is also the bridge with the longest span in the world, the longest steel structure and the longest submarine immersed tunnel, and is also the bridge with the most complicated technology in the history of highway construction in the world, the highest degree of construction difficulty and the largest project scale. Hong Kong-Zhuhai-Macao Bridge, one of the "Seven Wonders of the World", has extensively applied high-performance green bridge steel based on the new generation of controlled rolling and controlled cooling technology developed by Professor Wang Zhaodong from Northeastern University and has become a leader of Northeastern University in providing green metallurgy service to the world A vivid portrayal of major strategic needs In the recently held 2017 National Science and Technology Awards Conference, Northeastern University 'hot rolled strip steel controlled rolling and controlled cooling technology and application' won the second prize of national scientific and technological progress.
Complex seafloor structure, harsh natural environment, long span span, typhoon, huge waves, earthquakes and even salt water erosion of seawater all cause huge test for bridge steel. Therefore, the bridge spanning the bridge steel The high strength, weldability, anti-breaking, fatigue, corrosion resistance, put forward the extremely harsh performance requirements.
Steel for sea-crossing bridges mainly concentrates on steel pipe for bridge pile, bridge steel for main bridge of navigation, bridge guardrail and ribbed steel bar, among which bridge steel for pipe pile steel and navigable main bridge accounts for 60% of the total steel, Accounting for about 50% of the total amount of its steel.Pilestones are mainly made of hot-rolled coils, and the main specifications of bridge steel for the main bridge of navigation are between 10 and 50mm, mainly for flat products, while the new A generation of controlled rolling and rolling control technology is the hot-rolled strip green manufacturing representative process.
Northeastern University Professor Wang Zhaodong and its team developed a new generation of controlled rolling and controlled cooling process, established a super-rapid cooling at the core of fine-grain strengthening, precipitation hardening and phase transformation strengthening comprehensive toughening theory, so that the steel thinning 35% , The size of precipitated phase is reduced by more than 25%, which effectively meets the requirements of high strength and high toughness of bridge steel.Through the combination of optimized composition design + controlled rolling + rapid cooling after rolling, the team obtained a good organization Based on the improvement of the toughness, the yield ratio is reduced to meet the seismic and anti-strain design of the bridge.Relying on the ultra-fast cold equipment, the online heat treatment instead of the offline normalizing heat treatment can greatly reduce the carbon equivalent and increase The welding performance and toughness, to solve the traditional normal steel bridge post-stratification, toughness and poor surface quality and other issues, and promote high-performance steel bridge upgrading standards.
China Railway Shanqiao Group Co., Ltd., a long-term and deep cooperation with iron and steel enterprises such as Anshan Iron and Steel Group Co., Ltd., is in the process of constructing the Hong Kong-Zhuhai-Macao Bridge, the Alaska Railway Bridge in the United States, the bridge deck renovation of Verrazano Bridge, the largest Suspension Bridge in the United States, Bridge project, the use of more than 30,000 tons of Northeastern University rolling technology and automatic rolling State Key Laboratory independent research and development of a new generation of controlled rolling and controlled cooling steel bridge plate, the type of steel plate in the course of the performance of good stability , Showing excellent toughness and weldability, high precision steel sheet size, excellent surface quality, all the indicators are fully able to meet the requirements of the construction of super-long-span bridge structure, and effectively support and greatly enhance the international competitiveness of China's bridge manufacturing industry .
It is reported that a new generation of hot rolled strip steel controlled rolling and cooling technology, is 'resource conservation, energy saving and emission reduction' green steel manufacturing representatives of the project to create a new generation of hot rolled steel controlled rolling and cooling technology system, opened up to save alloy Elements, improve the performance of new ways of steel; created a hot-rolled steel integrated organization and control theory, reengineering a green steel composition and process system; independently developed a series of first sets of hot-rolled steel advanced rapid cooling equipment and control system, a China's hot-rolled steel production line main models; clarify the evolution of hot-rolled steel microstructure and strengthening mechanism, developed a series of low-cost high-performance steel materials.
Relying on this energy-saving emission reduction process, Northeastern University independently developed a series of first set of advanced hot-rolled steel rapid cooling equipment and control system, this set of equipment has become China's hot-rolled steel production line main models, covering Angang, Shougang 50 % Of the large steel enterprises, to achieve a high-quality and economize on the hot-rolled steel 40 million tons / year production scale through the implementation of the project, more than 80% of the hot-rolled steel strength index increased 100 ~ 200MPa, the main alloy element dosage savings of 20 ~ 30%, and promoted the upgrading of China's steel products from 'middle and low end' to 'middle and high end'. The products developed in the national strategic projects such as West-East Gas Pipeline, offshore platforms, cross-sea bridges, third generation nuclear power plants and large surface ships The project received 87 invention patents, published 149 papers of SCI / EI, 9 monographs and 47 international conference reports, winning high praise from domestic and foreign counterparts.
Professor Wang Zhaodong of Northeastern University and his team's achievements build our country's unique theoretical system of economizing on steel production and reduce the use of precious metals. It has been successively included in 16 industrial policy guide documents of 5 ministries and commissions such as Ministry of Science and Technology, Ministry of Industry and Information Technology, Development and Reform Commission, Promoted the transformation and upgrading of energy saving, emission reduction and greening in China's steel industry, realized an overall improvement in the performance of China's steel materials, promoted the localization of major metallurgical equipment, met the urgent need of national steel mills and enhanced the capability of independent guarantee of major national equipment. At the same time, the research projects also train nearly 100 senior professionals and professional engineers and technicians for enterprises and society, and raise the professional technical level of steel manufacturing and product development in our country.