1.Coke oven gas reduction technology is becoming mature
Coke oven gas is a hydrogen-rich high-quality resource with 55%-60% hydrogen content and about 25% methane content. In December 2022, the 600,000 tons/year scale hydrogen metallurgy demonstration project of HISCO Group Zhang Xuan Technology with coke oven gas as reducing gas was put into trial production.
2.Baowu made a major breakthrough in hydrogen-rich carbon cycle oxygen blast furnace
On November 16, 2022, China Baowu announced the completion of the first 400m3-class hydrogen-rich carbon cycle oxygen blast furnace (HyCROF). China Baowu test team has gradually completed the exploration of industrialized production tests of blowing decarbonized gas and hydrogen-rich smelting from 35% oxygen-rich, 50% ultra-high oxygen-rich to 100% oxyfuel smelting conditions, carried out industrialized tests of self-circulating blowing of high-temperature gas at 1200⊥ and hydrogen-rich smelting, and overcome the problems of efficient and low-cost carbon dioxide removal from metallurgical gas, safe heating of high-pressure high-reduction potential gas, high-temperature gas – pure oxygen – pulverized coal composite blowing and hydrogen-rich smelting. The main technical problems are: high efficiency and low cost carbon dioxide removal from metallurgical gas, high pressure and high reduction potential gas safety heating, high temperature gas-pure oxygen-pulverized coal composite blowing, and reasonable gas distribution under oxy-fuel smelting gas cycle.
3.Shagang’s blast furnace has achieved remarkable results in the application of key technologies for safe and long life self-repair
As the largest single high-temperature and high-pressure reactor, blast furnace is the main consumer of resources and energy in the process of steel production. Ltd. and University of Science and Technology Beijing and other units jointly developed the blast furnace safety and long life self-healing key technology, the furnace protection technology in the 3 # 2680m3 blast furnace since the application, the blast furnace cylinder temperature has been effectively controlled, the water temperature difference of the furnace cylinder from the highest 0.6 ⊥ to 0.3 ⊥; at the same time to improve the quality of the molten iron, molten iron titanium compliance rate ([Ti] < 0.1%) from 67.41% ( 2020) to 98.5% (2022), and the cost of furnace protection for the blast furnace was reduced by more than 40%. This technology won the First Prize of Metallurgical Science and Technology in 2022.
4.Domestic self-developed green and high-efficiency electric arc furnace steelmaking technology reaches international advanced level
In June 2022, the 75t green high-efficiency electric arc furnace of Sichuan Dugang Iron and Steel Group built by CMSD was successfully put into operation, achieving the target of “average smelting cycle of 35min, power consumption of 335kWh/t, electrode consumption of less than 1kg/t”, which is the first successful industrial application of this R&D achievement and achieved significant It can systematically solve the key problems of continuous charging, scrap preheating, waste heat utilization and exhaust gas treatment, and significantly improve the energy-saving and environmental protection level of electric arc furnace steelmaking.
5.High-efficiency and low-consumption manufacturing technology and application of super-large-size high-quality energy-use steel plates
Xingcheng Special Steel, together with China Metallurgical Jingcheng Engineering Technology Co., LTD., and China Iron and Steel Research Institute, has developed 450mm thickness straight arc slab continuous casting equipment and technology, and the common key technologies for controlling the organization and performance of the core of extra-thick steel plate. It has developed six types of ultra-large size and high-quality steel plates for Marine engineering and pressure vessels and popularized them. This project won the first prize of Metallurgical Science and Technology in 2022.
The world’s largest 450mm℅2600mm straight-arc continuous casting equipment and process technology, solving the problems of surface cracking and center loosening of extra-thick slab continuous casting. Using the straight arc continuous casting billet, the first to complete the product development and application of the international maximum thickness of 142-200mm high core quality series of energy-use steel plates with similar technology.
6.M2 high-speed steel short process production technology innovation
In November 2022, Jiangyin Huarun Steel Co., Ltd. and Shanghai University, Shanghai University (Zhejiang) high-end equipment basic parts materials research institute joint research, the successful development of M2 high-speed steel short process (arc continuous casting and rolling) production process technology.
M2 (W6Mo5Cr4V2) high speed steel is a Leydenite steel with high content of W, Mo, Cr, V, Co and other alloying elements (10%-25% in total). Compared with the traditional die casting process, the use of arc continuous casting machine equipment makes the vertical pressure of the steel during the solidification of the billet smaller, which reduces the internal cracking and segregation caused by the deformation of the drum belly and helps to improve the quality of the billet. The surface quality, low times, decarburization and other quality indicators are better than the relevant requirements of GB/T9943-2008. The core quality indicator of HSS, eutectic carbide unevenness, is one grade higher than the quality of the traditional long process; the maximum carbide size is refined by 20%.
