摘要
对浸入式水口结瘤物进行分析,水口内壁结瘤物呈现为片状、块球状、多面体状,尺寸为5~20μm,其主要是由钢液中的小尺寸Al_(2)O_(3)富集在水口内壁相互烧结形成的。水口外壁底部结瘤物为多面体状、片层状,尺寸一般在20μm以上,其为钢液在浇注过程中因二次氧化的Al_(2)O_(3)夹杂物不断长大形成的。通过转炉终点高拉碳,使转炉终点氧含量平均降至5.50×10^(-4);加强保护浇铸,中间包钢液全氧平均含量降至40×10^(-6)。采取优化措施后,有效减少了钢液中Al_(2)O_(3)夹杂物的生成量,同时避免了钢液的二次氧化,钢液可浇性明显提升。
Analysis of the clogs on the submerged nozzle shows that the clogs on the inner wall of the nozzle are in the form of flakes,spherical blocks,and polyhedra,with a size of 5-20μm;it is mainly formed by the adsorption and enrichment of small-sized Al_(2)O_(3) in the steel liquid on the inner wall of the nozzle and mutual sintering.The clogs on the bottom of the outer wall are polyhedral and layered,with a size of 20μm;it is formed by the continuous growth of alumina inclusions caused by secondary oxidation during the pouring process.By using high carbon pulling at the endpoint of the converter,the average oxygen content at the endpoint of the converter is reduced to 5.50×10^(-4).By strengthening the protection of casting,the average total oxygen content of the ladle steel is reduced to 40×10^(-6).After taking optimization measures,the amount of Al_(2)O_(3) inclusions is effectively reduced,secondary oxidation is avoided and the castability of the steel is significantly improved.
作者
周丹
高福彬
张涛
巩彦坤
Zhou Dan;Gao Fubin;Zhang Tao;Gong Yankun(HBIS Hanstee)
出处
《河南冶金》
2024年第3期21-25,38,共6页
Henan Metallurgy
