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Study on Inclusion Behaviour of 439 ferritic stainless steel during refining process

机译：439铁素体不锈钢在精制过程中的夹杂物行为研究

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The composition,type,amount,size and distribution of the inclusions in 439 ferritic stainless steel produced by the route of EAF-AOD-VOD-CC were investigated by optical microscope,scanning electron microscope and electrolysis of non-aqueous solution.The results showed that the main inclusions in 439 ferritic stainless steel in the slab are Al2O3,Ti(CN) and complex Ti(CN) inclusion with core of MgO-Al2O3 and TiOx.The total oxygen content in 439 ferritic stainless steel decreased gradually with the implementation of VOD refining and continuous casting,the average total oxygen content in slab is 24 ppm.The average diameter of the inclusion in slab is about 2.3 μm.The number proportion of inclusions with the diameter above 10μm is less than 0.4％ of the total inclusions.Foreign inclusions are TiOx-Al2O3-MgO-SiO2 in size above 50 μm covered by Ti(CN).Although these inclusions are very few,they do harm to the surface quality of stainless steel.It is able to reduce the risk of forming this kind of inclusion by aluminium deoxidation with increasing Al content to restrain the formation of TiOx.In addition,the feasibility of calcium treatment during refining of 439 ferritic stainless steel was also discussed in the paper.
机译：通过光学显微镜，扫描电子显微镜和非水溶液电解研究了439铁素体不锈钢中夹杂物的组成，类型，量，尺寸和分布，扫描电子显微镜和非水溶液电解。结果表明板坯中的439铁素体不锈钢中的主要夹杂物是Al 2 O 3，Ti（CN）和复合Ti（CN）包含MgO-Al2O3和TiOx的核。439铁素体不锈钢中的总氧含量随着实施而逐渐降低VOD精制和连续铸造，平均总氧含量为24ppm。夹杂物的平​​均直径为约2.3μm。具有直径10μm的夹杂物的数量比例小于总夹杂物的0.4％。外夹层是TiOx-Al2O3-MgO-SiO2，尺寸以上覆盖的Ti（CN）。虽然这些夹杂物很少，但它们对不锈钢的表面质量造成伤害。它能够降低形成这一点的风险亲属D铝脱氧与增加的Al含量抑制TiOx的形成。此外，在纸上还讨论了439铁素体不锈钢中精炼过程中钙处理的可行性。

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