Effect of non-calcium treatment on inclusions in high grade case hardening steel
YANG Guang-wei1, CHEN Zhao-ping1, LIU Xiang-chun2
1. Baosteel Central Research Institute, Baoshan Iron and Steel Co., Ltd., Shanghai 201999, China; 2. Tube, Pipe and Bar Business Unit, Baoshan Iron and Steel Co., Ltd., Shanghai 201999, China
Abstract:Inclusions in tundish with and without calcium treatment are studied by thermodynamic calculations and industrial trials for SCr420H gear steel. It is found that the inclusion amount without calcium treatment is lower than that with calcium treatment. Inclusions without calcium treatment are mainly angular magnesia-alumina spinel, while those with calcium treatment are mainly spherical Al2O3-CaO-MgO and CaS composites. After optimizing the process, the number of spinel inclusions in tundish without calcium treatment was greatly reduced, and the problems of nozzle blockage and B-type inclusions were solved. The results of inclusion rating for round steel without calcium treatment are as follows: Type A ≤ 0.5, Type B≤ 0.5, Type C=0, Type D (thin)≤ 1.0, Type D (heavy)≤ 0.5, and Type Ds ≤ 1.0.
杨光维, 陈兆平, 柳向椿. 非钙处理对高等级齿轮钢夹杂物的影响[J]. 钢铁, 2020, 55(4): 40-44.
YANG Guang-wei, CHEN Zhao-ping, LIU Xiang-chun. Effect of non-calcium treatment on inclusions in high grade case hardening steel. Iron and Steel, 2020, 55(4): 40-44.
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