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The effect of B 2 O 3  on slag-metal reaction between CaO-Al 2 O 3 -based mold flux and high aluminum steel was investigated. The results showed that the addition of 5 % B 2 O 3 , the slag-metal reaction hardly occurred. When the content of B 2 O 3  was increased, the reaction rate increased rapidly. This indicated if only considering the slag-metal reaction, it’s better for high aluminum steel casting if the addition content of B2O3 is less than 5%. The chemical reaction was greatly influenced by the reaction time. With higher content of aluminum ([Al]=0.1 %), the early stage of reaction was greatly affected by the reaction time, and furtherly, the influence was decreased. When the aluminum content was increased, the effect of [Al] on the slag-metal reaction was comparatively small in the initial 10 min, and the content of [B] was increased slightly. But when the reaction time increased to 1 hour, the slag-metal reaction acutely occurred, and the content of [B] increased rapidly.

Effect of B 2 O 3 on Slag-Metal Reaction between CaO-Al 2 O 3 -Based Mold Flux and High Aluminum Steel