Effect of ESR on oxygen content and inclusions in GCr15 bearing steel
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摘要: 电渣重熔对于提高钢的纯净度有明显的效果，但对于低氧含量钢种存在增氧现象。通过采用GCr15轴承钢作为自耗电极，研究在大气环境下和Ar保护下使用不同渣系对轴承钢中氧含量及夹杂物的变化规律。研究发现，采用CaF2-Al2O3-CaO三元渣系在氩气保护下电渣重熔GCr15轴承钢时，电渣锭中的氧含量随渣系中的Al2O3含量下降而降低，而使用不含Al2O3渣系重熔的电渣锭中氧含量最低；氩气保护下重熔的电渣锭中的夹杂物直径均比使用同种渣系在空气中重熔的电渣锭要小。氧含量增加主要是因为电渣重熔过程渣池温度过高，导致渣中Al2O3稳定性变差所致。Abstract: Electroslag remelting has a positive effect on improving the purity of steel, but it will increase oxygen for low oxygen content steel. In this paper, GCr15 bearing steel was used as consumable electrode to study the variation of oxygen content and inclusions in bearing steel with different slag systems under atmospheric environment and Ar protection. It is found out that the oxygen content in ESR ingot decreases with the decrease of the alumina content in the slag system when the CaF2-Al2O3-CaO ternary slag system is used for ESR of GCr15 bearing steel under the protection of argon, while the oxygen content in ESR ingot remelted with the slag system without Al2O3 is the lowest. The diameter of inclusions in ESR ingot remelted under the protection of argon is smaller than that of steel remelted with the same slag system in air. The increase of oxygen content is mainly due to the high temperature of slag pool during ESR, which leads to the poor stability of Al2O3 in slag.
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Key words:
- electroslag remelting /
- GCr15 bearing steel /
- oxygen /
- inclusion
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图 4 电渣重熔前后不同直径夹杂物分布变化
Figure 4. Variation of inclusion distribution before and after ESR
图 5 电极中夹杂物种类及数量分布
Figure 5. Distribution of type and quantity of inclusions in electrode
图 9 Ar保护下电渣锭中夹杂物直径的变化
Figure 9. Variation of inclusion diameter in ESR ingot under Ar protection
图 10 电渣重熔后电渣锭夹杂物种类及数量
Figure 10. Types and number of inclusions in ESR ingot under Ar protection
图 11 方案8重熔后电渣锭中典型夹杂物形貌及成分分布
Figure 11. Morphology and composition distribution of typical inclusions in ESR ingot after remelting under scheme 8
表 1 GCr15轴承钢主要化学成分
Table 1. Main chemical compositions of GCr15 bearing steel
% C Si Mn Cr Al P S O N 0.99 0.21 0.35 1.47 0.02 0.009 0.001 0.00075 0.0039 
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表 2 试验用渣系化学成分及试验方案
Table 2. Chemical compositions and experimental scheme of experimental slag system
研究方案 渣系 成分 气氛 1 S1 70%CaF2+30%Al2O3 大气 2 S2 65% CaF2+25% Al2O3+10%CaO 大气 3 S3 60% CaF2+20%Al2O3+20%CaO 大气 4 S4 60% CaF2+15%Al2O3+25%CaO 大气 5 S5 70% CaF2+30%CaO 大气 6 S1 70%CaF2+30%Al2O3 Ar 7 S3 60%CaF2+20%Al2O3+20%CaO Ar 8 S5 70%CaF2+30%CaO Ar
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