1.新余钢铁股份有限公司,新余 338001
2.安徽工业大学冶金工程学院,马鞍山 243032
陈登国(1981—),男,高级工程师; E-mail: cdg@xinsteel.com.cn
万勇(1987—),男,博士,副教授; E-mail: wanyong0729@163.com
收稿:2024-07-26,
纸质出版:2025-01-30
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陈登国,吕继平,万勇等.9Ni钢夹杂物演变及钙处理工艺优化[J].特殊钢,2025,46(01):66-74.
Chen Dengguo,Lv Jiping,Wan Yong,et al.Inclusion Evolution and Calcium Treatment Optimization of 9Ni Steel[J].Special Steel,2025,46(01):66-74.
陈登国,吕继平,万勇等.9Ni钢夹杂物演变及钙处理工艺优化[J].特殊钢,2025,46(01):66-74. DOI: 10.20057/j.1003-8620.2024-00188.
Chen Dengguo,Lv Jiping,Wan Yong,et al.Inclusion Evolution and Calcium Treatment Optimization of 9Ni Steel[J].Special Steel,2025,46(01):66-74. DOI: 10.20057/j.1003-8620.2024-00188.
通过工业试验和Aspex全自动夹杂物分析技术,对9Ni钢在LF→RH→CC炼钢过程[T.O]、[N]含量、显微夹杂物数量、尺寸及类型的演变规律进行了系统研究,并结合FactSage软件探究了钙处理条件下钙铝酸盐和CaS夹杂的形成机理。结果表明,在LF第一次送电结束→LF第二次送电结束和RH软吹氩气20 min→轧材这两段工艺区间,9Ni钢中[T.O]、[N]含量均同时升高,表明在这两段工艺区间钢液存在二次氧化。9Ni钢轧材中夹杂物类型以CaO-Al
2
O
3
-MgO和CaO-Al
2
O
3
-CaS复合夹杂为主,尺寸主要位于2~5 μm。当钙线量从200 m降至100 m,9Ni钢轧材中2~5 μm的夹杂物密度明显减小,基本未发现含CaS组分的夹杂物,其D类细系、DS类夹杂物评级分别从1.0、1.5级降至0.5、0.5级。喂钙线200、100 m的9Ni钢轧材中复合夹杂物的密度、大小和平均成分的Aspex统计结果与其夹杂物评级结果和FactSage计算结果均具有较好的一致性。
By means of industrial test
and Aspex automatic inclusion analysis techonogy, the evolution law of [T.O], [N] content, microinclusions quantity, size and type of 9Ni steel in LF→RH→CC steelmaking process were systematically studied. The formation mechanism of calcium-aluminate and CaS inclusions under calcium treatment conditions was investigated by FactSage software. The results show that the content of [T.O] and [N] in 9Ni steel increases simultaneously in the process interval from LF first power supply→LF second power supply and RH soft blowing argon gas for 20 min→rolling, indicating that there is secondary oxidation in the molten steel in these two process intervals. The inclusions in 9Ni steel are mainly CaO-Al
2
O
3
-MgO and CaO-Al
2
O
3
-CaS complex inclusions, and the size is mainly between 2 μm-5 μm. When the calcium line is reduced from 200 m to 100 m, the density of 2 μm-5 μm inclusions in 9Ni steel rolled material is significantly reduced, and basically no inclusions containing CaS components are found, and the grades of DT and DS inclusions are reduced from 1.0 and 1.5 grades to 0.5 and 0.5 grades, respectively. The Aspex statistical results of the density, size and average composition of composite inclusions in 9Ni steel rolled sheets with 200 m and 100 m calcium line are in good agreement with the inclusion rating results and FactSage calculation results.
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