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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摘要为研究27SiMn钢中非金属夹杂物的生成及演变规律,对某钢厂生产现状进行系统分析。通过工业试验探究“LF进站→钙处理前→软吹后→中间包→铸坯”各阶段夹杂物演变行为,并针对27SiMn钢钙处理现状,应用热力学计算了钙处理钢液中的Al-Ca平衡反应。结果表明,钙处理前夹杂物以CaO-MgO-Al₂O₃三元系夹杂物为主,Al₂O₃质量分数约为67%;软吹后,在CaO-MgO-Al₂O₃系三元相图中,Al₂O₃质量分数减少了约35%,夹杂物成分平均向CaO质量分数高的一侧移动。在CaS-CaO-Al₂O₃系三元相图中,由于夹杂物成分内含有较高的CaS质量分数,约为21%,夹杂物成分也未进入液相区域;铸坯工序,夹杂物多数转变为球状CaO-MgO-Al₂O₃-SiO₂复合夹杂,且观察到大量CaS夹杂物。经热力学分析,在1 873 K下,钢中w([Al])=0.022%时,w([Ca])控制在0.001 3%~0.003 5%之间,处在利于生成12CaO·7Al₂O₃区域,可提高对夹杂物液态改性效果;同时,为防止钢液内纯CaS夹杂物析出,w([S])应控制在0.004 8%以下。

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关键词 ： 27SiMn钢, 非金属夹杂物, 精炼, 演变, 热力学计算

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

收稿日期: 2022-09-02

引用本文:

宋保民, 史书广, 刘坤龙, 吕明. 27SiMn钢非金属夹杂物生成及演变规律[J]. 连铸, 2023, 42(2): 57-62. SONG Bao-min, SHI Shu-guang, LIU Kun-long, LÜ Ming. Formation and evolution of nonmetallic inclusions in 27SiMn steel. CONTINUOUS CASTING, 2023, 42(2): 57-62.

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