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Influence of crucible material on inclusions in 95Cr saw-wire steel deoxidized by Si-Mn
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-08-15 , DOI: 10.1007/s12613-019-1957-8
Yang Li , Chang-yong Chen , Guo-qing Qin , Zhou-hua Jiang , Meng Sun , Kui Chen

To investigate the interaction mechanism between 95Cr saw-wire steel and different refractories, we conducted laboratory experiments at 1873 K. Five crucible materials (SiO2, Al2O3, MgO·Al2O3, MgO, and MgO-CaO) were used. The results indicate that SiO2, Al2O3, and MgO·Al2O3 are not suitable for smelting low-oxygen, low-[Al]s 95Cr saw-wire steel, mainly because they react with the elements in the molten steel and pollute the steel samples. By contrast, MgO-CaO is an ideal choice to produce 95Cr saw-wire steel. It offers three advantages: (i) It does not decompose by itself at the steelmaking temperature of 1873 K because it exhibits good thermal stability; (ii) [C], [Si], and [Mn] in molten steel cannot react with it to increase the [O] content; and (iii) it not only desulfurizes and dephosphorizes but also removes Al2O3 inclusions from the steel simultaneously. As a result, the contents of the main elements ([C], [Si], [Mn], [Cr], N, T.O (total oxygen)) in the steel are not affected and the content of impurity elements ([Al]s, P, and S) can be perfectly controlled within the target range. Furthermore, the number and size of inclusions in the steel samples decrease sharply when the MgO-CaO crucible is used.



中文翻译:

坩埚材料对Si-Mn脱氧的95Cr锯线钢中夹杂物的影响

为了研究95Cr锯线钢与不同耐火材料之间的相互作用机理,我们在1873 K进行了实验室实验。五种坩埚材料(SiO 2,Al 2 O 3,MgO·Al 2 O 3,MgO和MgO-CaO)为用过的。结果表明,SiO 2,Al 2 O 3和MgO·Al 2 O 3不适合冶炼低氧,低[Al] s95Cr锯线钢,主要是因为它们与钢水中的元素发生反应并污染了钢样品。相比之下,MgO-CaO是生产95Cr锯线钢的理想选择。它具有三个优点:(i)它在1873 K的炼钢温度下不会自行分解,因为它具有良好的热稳定性;(ii)钢水中的[C],[Si]和[Mn]不能与之反应而增加[O]含量;(iii)不仅使钢脱硫和脱磷,而且同时从钢中除去Al 2 O 3夹杂物。结果,钢中主要元素([C],[Si],[Mn],[Cr],N,TO(总氧)的含量不受影响,杂质元素([Al] ],P和S)可以完美地控制在目标范围内。此外,当使用MgO-CaO坩埚时,钢样品中夹杂物的数量和尺寸急剧减小。

更新日期:2020-08-15
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