Three-Dimensional Evaluation of Inclusions during the Production of Stainless Steel
Nozzle clogging is a serious problem during continuous casting in the steel industry. The present work is focused on a comparison of the inclusion characteristics in two similar steel grades of high-silicon non-calcium treated (HSiNC) stainless steels with respect to clogging during continuous casting. During two plant trials (Non-clogged heat: Fe-19Cr-12Ni-2Si, Clogged heat: Fe-23Cr-19Ni-3Si), samples of liquid steel and slag were taken during different stages of the ladle treatment and casting. After electrolytic extraction of the steel samples, characteristics of inclusions and clusters (such as morphology, composition, size and number) were investigated in three dimensions (3D) on the surface of film filter with an open pore size of 1 μm by SEM in combination with EDS. It was found that all the steel samples of both heats contain spherical (SP), irregular and regular (IR) inclusions and clusters (CL). The morphology and composition of inclusions and clusters in both heats are changed during the ladle treatment and casting. In the Non-clogged heat, the composition was mostly MgO-SiO2-Al2O3-CaO (with lower concentration of Al2O3). In the Clogged heat, the compositions of IR inclusions and clusters were mostly MgO-Al2O3 spinel (with higher concentration of Al2O3) and the complex SP inclusions contained Al2O3-MgO-CaO-SiO2. The compositions of inclusions and clusters were studied as functions of size and morphology.
stainless steel inclusion cluster morphology composition clogging
Yanyan BI Erik ROOS Andrey KARASEV P(a)r G. J(o)nsson
Materials Science and Engineering, KTH Royal Institute of Technology, Brinellv(a)gen 23, Stockholm, SE-100 44 Sweden
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-11
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）