Li Longfei,Niu Chengzhou,Wang Ning,et al.Design of Slag System for FB2 Heat-resistant Steel Electroslag Remelting and Its Effect on Element Loss[J].Special Steel,2025,46(04):92-99.
Li Longfei,Niu Chengzhou,Wang Ning,et al.Design of Slag System for FB2 Heat-resistant Steel Electroslag Remelting and Its Effect on Element Loss[J].Special Steel,2025,46(04):92-99. DOI: 10.20057/j.1003-8620.2025-00122.
Design of Slag System for FB2 Heat-resistant Steel Electroslag Remelting and Its Effect on Element Loss
Based on the principle of low eutectic point, a new basic slag system for electric slag remelting of FB2 heat-resistant steel was designed and calculated by FactSage software. The effects of traditional slag system 69.65% CaF
2
-29.85% Al
2
O
3
-0.5% B
2
O
3
(1
#
) and new slag system 50.4% CaF
2
-26.5% CaO 19.6% Al
2
O
3
3% MgO 0.5% B
2
O
3
(2
#
) on the content changes of easily oxidizable elements in steel were compared and investigated using slag-metal equilibrium and 10 kg electroslag remelting experiments.The results show that , compared with the traditional slag system, the melting temperature, viscosity and resistivity at different temperatures of the new design slag system are lower.When the activity of Al
2
O
3
component in the slag is high and the activity of SiO
2
and B
2
O
3
components is at a low level, Si and B probably will react with low oxygen potential Al
2
O
3
between the slag and the metal based on thermodynamic calculations. The content of
w
[B] in the reaction equilibrium between the two slag systems and FB2 steel is 0.001 9% ,0.004 3%, respectively. In both slag series, Si and B elements will be burned and Al is increased in steel during slag-metal equilibrium and electroslag remelting smelting. In 2
#
slag series, the element fluctuation is small, and the variation range of element content decrease significantly after 60 min of slag-metal equilibrium time. In contrast, the change in element content in the electric slag ingot after remelting is smaller.
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