船用高止裂韧度特厚钢板EH47BCA工业研发

Industrial research and development of ultra-thick steel plates EH47BCA with high crack arrest toughness for container ships

介绍了集装箱船用高止裂韧度特厚钢板EH47BCA的工业化研发。研发结果表明:采用NEU⁃Rolling往复相变控轧工艺能够更好地实现组织调控,与传统TMCP工艺比较,在全厚度的大角度晶界比例更高,组织更加细小均匀,表现出优异的低温韧性。研发的100 mm厚高止裂韧性EH47BCA钢在全尺寸拉伸断裂时表现出显著阻滞脆性裂纹传播的能力,形成了“多峰”分布的宏观断口,提高了钢板全厚度断裂时的止裂韧性,−10℃止裂韧性达到9041 N/mm^(3/2)。

The industrial research and development process of ultra thick steel plate EH47BCA with the high crack arrest toughness for container ships are introduced in this study.The research results show that using the NEU-Rolling reciprocating phase transformation controlled rolling process can better achieve microstructure control.Compared to the traditional TMCP process,the steel produced using the NEU-Rolling process exhibits a higher proportion of high-angle grain boundaries throughout the entire thickness,resulting in a finer and more uniform microstructure and demonstrating excellent lowtemperature toughness.The developed 100 mm thick high crack arrest toughness EH47BCA steel shows significant capability to inhibit brittle crack propagation during full-size tensile fracture,forming a“multi-peak”distribution of macroscopic fracture surfaces,enhancing the steel plate’s crack arrest toughness during full-thickness fracture.The crack arrest toughness at‒10℃ reaches 9041 N/mm^(3/2).