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Optimization of AISI 443 Stainless Steel Cleanness during Secondary Steelmaking Process
Author(s) -
Li Jingyu,
Cheng Guoguang,
Ruan Qiang,
Pan Jixiang,
Chen Xingrun
Publication year - 2020
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201900556
Subject(s) - materials science , metallurgy , steelmaking , oxide , deoxidization , nitride , melting point , layer (electronics) , composite material
Nonmetallic inclusions formed during the Ti‐stabilized 443 stainless steelmaking process can cause the clogging of submerged entry nozzle (SEN) and surface defects of cold‐rolled steel. The formation mechanism of oxide inclusions in 20Cr stainless steel is investigated by industrial experiment and FactSage thermodynamic calculation. After Al deoxidized and calcium treatment, the main types of inclusions in three heats are different, including irregular MgO–Al 2 O 3 and spherical CaO–MgO–Al 2 O 3 , which is due to the different Ca and Al contents in samples. Combined with FactSage thermodynamic calculations, the calcium contents which can effectively modify oxide inclusions in 443 stainless steels with different Al contents are obtained. The initial calcium and aluminum contents in molten steel affect the main type of oxide inclusions formed during Ti addition process. High‐melting‐point Ca–Ti–O inclusions are observed in the sample containing high Ca content and low Al content. The experimental results and FactSage thermodynamic calculation results show that reducing Ca content and increasing Al content before Ti addition can reduce the formation of high‐melting‐point perovskite inclusions.