27SiMn钢非金属夹杂物生成及演变规律

doi:10.13228/j.boyuan.issn1005-4006.20220150

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Abstract In order to study the formation and evolution of non-metallic inclusions in 27SiMn steel, the production status of a steel plant was systematically analyzed. The evolution behavior of inclusions in each stage of “LF inlet→before calcium treatment→after soft blowing→tundish→slab” was explored through industrial experiments. According to the current situation of calcium treatment of 27SiMn steel, the Al-Ca equilibrium reaction in the molten steel treated with calcium was calculated by thermodynamics. The results show that the inclusions before calcium treatment are mainly CaO-MgO-Al₂O₃ ternary inclusions, and the mass fraction of Al₂O₃ is about 67%. After soft blowing, in the ternary phase diagram of CaO-MgO-Al₂O₃ system, the mass fraction of Al₂O₃ was reduced by about 35%, and the inclusions moved to the side with high CaO mass fraction on average. In the ternary phase diagram of CaS-CaO-Al₂O₃ system, the inclusion composition does not enter the liquid phase region because of the high CaS mass fraction in the inclusion composition, which is about 21%. In the casting process, most of the inclusions were transformed into spherical CaO-MgO-Al₂O₃-SiO₂ composite inclusions, and a large number of CaS inclusions were observed. Through thermodynamic analysis, at 1 873 K, when w([Al])=0.022% in steel, w([Ca]) is controlled between 0.001 3% and 0.003 5%, which is in the region conducive to the formation of 12CaO·7Al₂O₃, which can improve the liquid modification effect of inclusions. At the same time, in order to prevent the precipitation of pure CaS inclusions in molten steel, w([S]) should be controlled below 0.004 8%.

Key words： 27SiMn steel non-metallic inclusion refining evolution thermodynamic calculation

Received: 02 September 2022

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20220150 OR http://www.chinamet.cn/Jweb_lz/EN/Y2023/V42/I2/57

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