Industrial production technology and application of marine heavy-gauge steel plate with high crack arrest toughness
TIAN Yong1, WANG Hongtao1, XU Xiaoning1, QIU Baowen2, LI Hengkun2
1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China; 2. Nanjing Iron and Steel Research Institute, Nanjing Iron and Steel Co., Ltd., Nanjing 210035, Jiangsu, China
Abstract：With the rapid development of mega container carriers,steel with excellent crack arrest ability and a thickness of 100 mm is applied to the large cargo opening structure such as the upper deck,hatch side coamings,and sheer strakes to ensure the ship′s safety. Based on the NEU-Rolling process,industrially produced a 100 mm ultra-thick EH47 steel plate with uniform microstructure and excellent crack arrest toughness. The microstructure of EH47 heavy-gauge steel is a mixture of ferrite and bainite. Under the restriction of low compression ratio,the NEU-rolling process is based on the control of "core-surface" temperature difference and load distribution of steel plates to refine the austenite grains in the core position by enhancing the deformation. Refine the austenite grains in the surface layer by repeated phase change coupling deformation. Finally,fine,uniform elongated austenite grains were formed along the full thickness of the plate. The flattened,refined and homogenized austenite grains with full-thickness are the key to the full-thickness refinement of microstructures in heavy-gauge steel. In addition,the volume percent of the {110} slip plane in the core/near-core microstructure of the steel plate is elevated compared to the surface layer of the steel plate while the content of the {001} plane decreases. The excellent low-temperature toughness caused by the ductile microstructures and texture in the center of the steel makes the microstructure in the center and 1/4 thickness have a similar ability to arrest the propagation of the brittle crack in the full-scale fracture of the steel. So,the "multi peaks" are formed and the crack arrest toughness of steel in the full-thickness fracture is improved. The EH47 crack arrest steel plates with a thickness of 100 mm have a brittle crack arrest toughness of 9 041 N/mm3/2 at -10 ℃,far exceeding the relevant standards of the International Classification Society and achieving the world′s only supply of high crack arrest toughness steel with a thickness of 100 mm.
田勇, 王红涛, 徐晓宁, 邱保文, 李恒坤. 高止裂韧度特厚板工业化生产技术开发及应用[J]. 钢铁, 2023, 58(9): 185-193.
TIAN Yong, WANG Hongtao, XU Xiaoning, QIU Baowen, LI Hengkun. Industrial production technology and application of marine heavy-gauge steel plate with high crack arrest toughness[J]. Iron and Steel, 2023, 58(9): 185-193.
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2023, Vol. 58 
