铝对稀土耐热钢中非金属夹杂物的影响

doi:10.13228/j.boyuan.issn0449-749x.20210570

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Abstract As a common alloying element in high-quality steel, rare earth is widely used to improve the properties of steel. However, due to the strong affinity between rare earth and impurity elements such as oxygen and sulfur in steel, the formation of inclusions with high melting point and large size after rare earth addition are seriously harmful to casting process and product quality. In order to investigate the effect of different Al contents on the type and size distribution of non-metallic inclusions in heat resistant steel containing rare earth, high temperature experiments were designed and carried out according to calculation by optimized thermodynamic model. The results of calculation show that increase of Al content can inhibit the precipitation of Ce₂O₃ inclusions, but promote the precipitation of CeAlO₃ and Ce₂O₂S inclusions in steel. The changes of Ce, Al, O and S in molten steel were calculated, and thereby obtaining the critical thermodynamic conditions of inclusion transformation. When w([Al]) was 0.025%-0.065%, and the w([Al])/w([Ce]) value was 270, Ce₂O₃ transformed into CeAlO₃. Ce₂O₃ converted to Ce₂O₂S with Al content ranging from 0.065% to 0.17% and w([S])/w([O]) value up to 10. The experiment results show that inclusions variation trend is Ce₂O₃→Ce₂O₃+CeAlO₃→CeAlO₃+Ce₂O₂S with the increase of mass percent of Al from 0 to 0.3% under a certain Ce amount in different test steels, and the average particle size of inclusions reduces from 4.69 μm to 2.73 μm accordingly. Based on the statistical results of relationship between inclusion type and size distribution, it is found that the formation of Ce₂O₂S with small size is one of the main cause for decrease of inclusions size. Therefore, increase of Al contents in rare earth heat-resistant steel appropriately can effectively refine the size of inclusions in steel by modifying the inclusion types, which is expected to improve the nozzle clogging problem and the product quality.

Key words： Al deoxidation heat-resistant steel containing rare earth element thermodynamic calculation inclusion type size refinement

Received: 17 September 2021

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	WANG Ye-guang
	LIU Cheng-jun
	QIU Ji-yu

Cite this article:

WANG Ye-guang,LIU Cheng-jun,QIU Ji-yu. Effect of Al content on non-metallic inclusions in heat-resistant steel containing rare earth element[J]. Iron and Steel, 2022, 57(4): 52-57.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210570 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I4/52

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