Li Longfei,Lin Tengchang,Zhang Qiang,et al.Effect of Electroslag Remelting Slag System on Inclusions in C-HRA-3 Heat-Resistant Alloy[J].Special Steel,2023,44(05):76-82.
Li Longfei,Lin Tengchang,Zhang Qiang,et al.Effect of Electroslag Remelting Slag System on Inclusions in C-HRA-3 Heat-Resistant Alloy[J].Special Steel,2023,44(05):76-82. DOI: 10.20057/j.1003-8620.2023-00089.
Effect of Electroslag Remelting Slag System on Inclusions in C-HRA-3 Heat-Resistant Alloy
In this paper, the effects of two types of electroslag remelting slag systems on the content of the quantity, size, and distribution of inclusions in C-HRA-3 heat-resistant alloy electroslag ingots was investigated by using a 10 kg level protective atmosphere electroslag remelting furnace. The results show that the liquidus temperature of 60% CaF
2
-20% Al
2
O
3
-10% CaO-10% MgO based slag system is 1 417 ℃, the liquidus temperature of new type 50.4% CaF
2
-26.1% Al
2
O
3
-19.5% CaO-4% MgO based slag system is 1 324 ℃ and the new type slag system has a narrow temperature range between solidus and liquidus, and the resistivity of liquid slag is high, which can ensure the high melting rate and stable smelting of C-HRA-3 alloy electroslag remelting. The inclusions in the electroslag ingots produced by two slag systems mainly include oxides, carbonitrides, and sulfides. The number of inclusions at the edge of the electroslag ingots is similar to that of the consumable electrode, and the number of inclusions from the edge to the center of the electroslags shows a gradually decreasing trend. Moreover the average size of oxide inclusions in electroslag ingots smelted with two slag systems is respectively 3.019 μm and 2.341 μm. Along different radial positions of the new type slag system smelting electroslag ingot, the proportion of oxide inclusions with size
>
3 μm is smaller, which has a more significant removal effect on large-sized oxide inclusions in C-HRA-3 alloy.
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