Research on mechanism of effect on plate quality of intermediate crack of slab

2018 1st International Conference on Environment Prevention and Pollution Control Technology

生态环境科学

Xinyu, Zhao^1,2 ; Yang, Liu^1,2 ; Xiantang, Hu^3 ; Xingang, Zhen^3

Plate Technology Department, Shougang Research Institute of Technology, Beijing

100043, China^1

Beijing Engineering Research Center of Energy Steel, Beijing

100043, China^2

Shougang Jingtang United IronandSteel Co. Ltd, Tangshan Hebei Tangshan

063200, China^3

关键词: Desulphurization;    Hydrogen atoms;    Hydrogen molecule;    Hydrogen reduction;    Plate forms;    Plate quality;    Volume expansion;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/199/3/032003/pdf
DOI  :  10.1088/1755-1315/199/3/032003

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Mechanism of transformation from intermediate cracks of slab to defects of plate is studied. It can be seen that there are dimension 10∼50μm inclusions MnS precipitating around intermediate cracks of slab. After rolling, there are 10∼500μm inclusions MnS around defects rolled on plate. Then the transformation of defects can be summarized as: The intermediate cracks form during solidification and the inclusions MnS precipitate around intermediate cracks. After rolling, the defects of plate form because the seaming of cracks by rolling are restraint by inclusions MnS. Then the hydrogen atoms assemble around defects to form hydrogen molecules, which makes the defects worse because of volume expansion of hydrogen. Moreover the optimizations of hydrogen reduction, desulphurization and crack reduction are suggested to reduce the influence on quality of intermediate cracks.