en.Wedoany.com Reported - Recently, Hongbo New Materials Company, a subsidiary of China's Jiuquan Iron and Steel (Group) Co., Ltd. (JISCO), successfully rolled an ultra-thick carbon structural steel plate with a thickness of 105mm in Jiayuguan City, Gansu Province. This breakthrough surpasses the original design thickness range of 6 to 100mm for the company's heavy plate production line, achieving stable production of ultra-thick carbon structural steel plates and opening a new path for expanding the high value-added heavy plate market.
Ultra-thick carbon structural steel plates, based on carbon structural steel, have a thickness far exceeding conventional plates. Widely used in key fields such as energy equipment, heavy machinery, and marine engineering, they feature high strength, good toughness, excellent welding performance, and strong load-bearing capacity. They are a significant indicator of a steel enterprise's comprehensive strength, with market demand trending towards high-end and customized specifications.
The production of ultra-thick steel plates poses extreme challenges to the technical capabilities of the entire process chain. At the equipment level, the rolling mill must provide immense rolling force and torque, the heating furnace must precisely control temperature uniformity, and the leveling equipment must effectively correct plate warpage during rolling. At the process level, the precise design of rolling passes and reduction amounts directly impacts product quality, and the cooling rate requires coordinated control of the core and surface. At the quality level, internal defects such as segregation and porosity must be eliminated from the smelting source, and surface imperfections like oxide scale indentation must be strictly controlled.
Facing these challenges, the technical team of Hongbo New Materials Company, leveraging its accumulated expertise across the entire process, focused on systematically tackling the full chain of smelting, heating, rolling, cooling, and leveling, achieving multiple innovative results: optimizing the heating system to ensure uniform and stable temperature inside and outside the billet, innovating the rolling process model to precisely match pass reduction and deformation rate, refining cooling and leveling processes to ensure flat plate shape and precise dimensions, and establishing a full-process quality traceability and anomaly correction mechanism.
According to professional testing, all indicators of the trial-produced 105mm ultra-thick carbon structural steel plate performed excellently: dimensional accuracy fully met standards, surface quality was excellent, internal structure was dense, and key mechanical properties such as yield strength, tensile strength, elongation after fracture, and room temperature impact energy all satisfied relevant standard requirements, fully meeting downstream needs for welding, processing, and assembly. This successful rolling marks a new milestone in the technical capabilities of JISCO Hongbo New Materials Company in the field of heavy plate production.
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