Effect of Mg-treatment on transformation of oxide inclusions in X80 pipeline steel

被引:0
作者
Shen, Ping [1 ]
Zhang, Hao [1 ]
Xu, Kang [1 ]
Liu, Shuai [2 ]
Jiang, Jin-xing [2 ]
Fu, Jian-xun [1 ]
机构
[1] Shanghai Univ, Ctr Adv Solidificat Technol CAST, State Key Lab Adv Special Steel, Shanghai 200444, Peoples R China
[2] Nanjing Iron & Steel Co Ltd, Nanjing 210000, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Pipeline steel; Mg-treatment; Ca-treatment; Calcium aluminate; MgO center dot Al2O3; TEMPERED STEEL; MORPHOLOGY; CA; PRECIPITATION; MAGNESIUM; EVOLUTION; BEHAVIOR; SULFUR;
D O I
10.1007/s42243-024-01208-3
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
In order to investigate the modification behavior and regularity of inclusions in X80 pipeline steel by Mg-treatment, the comparative industrial experiments of Mg-treatment and Ca-treatment in X80 pipeline steel were carried out. Mg and Ca were added to the steel in the form of cored wire after RH (Ruhrstahl-Hereaeus vacuum degassing) process. After adding Ca-containing cored wire, the inclusions were transformed into CaO-Al2O3 in the steel. With the progress of smelting, the cleanliness of molten steel became worse, and the equivalent diameter of inclusions was at a higher level. Mg-treatment had a good effect on the modification of inclusions. After Mg-containing cored wire was added to the steel, Al2O3 and CaO-Al2O3 in the steel were transformed into MgO, MgO<middle dot>Al2O3, and CaO-MgO-Al2O3 inclusions, which were basically spherical. The initial precipitated MgO became the core of other inclusions in the steel, which promotes the precipitation of MgO<middle dot>Al2O3. After Mg-treatment, almost no unmodified calcium aluminate inclusions existed in the hot rolled plate, and the cleanliness of the steel was improved. The effect of Ca and Mg on the transformation of inclusions in pipeline steel was studied by thermodynamic calculation, the result of which is consistent with the experimental results.
引用
收藏
页码:2802 / 2814
页数:13
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