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采用不同量的CaF_2、MgF_2、Na_3AlF6以及CaF_2与MgF_2的混合物对钢液中Al_2O_3夹杂物进行改性处理。结果表明:经过改性处理后的钢中全氧含量都有明显的降低,但其添加量需要在一个合适的范围,其中添加1.0%的CaF_2与MgF_2的混合改性剂的效果最好。另外经过改性剂处理后的钢中夹杂物呈现出MnS包裹Al_2O_3的复合分层形态,更加有利于夹杂物的上浮去除,而且MnS为塑性夹杂物,可降低残留在钢中Al_2O_3夹杂物对钢的危害。
Different amounts of CaF_2, MgF_2, Na_3AlF_6 and mixtures of CaF_2 and MgF_2 were used to modify Al_2O_3 inclusions in molten steel. The results showed that the content of total oxygen in the treated steel decreased obviously, but the amount of the modified steel needed to be within a suitable range. The best effect was obtained by adding 1.0% CaF 2 and MgF 2 mixed modifier. In addition, the inclusions in the steel treated with the modifier show the composite delamination morphology of MnS wrapped Al 2 O 3, which is more conducive to the floating removal of inclusions, and MnS is a plastic inclusion that can reduce the inclusions of Al 2 O 3 remaining in the steel. The harm.