采用不同量的CaF2、MgF2、NaAlF6以及CaF2与MgF2的混合物对钢液中Al2O3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CaF2与MgF2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Al2O3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Al203夹杂物对钢的危害.
Different amounts of CaF2,MgF2,Na3AlF6,mixture of CaF2 and MgF2 were added into the liquid steel for Al2O3 inclusions modification.The results show that total oxygen content of the treated steel obviously decreases,but the amount of addition needed shall be in a suitable range.adding 1.0％ of mixture of CaF2 and MgF2 can achieve the best modification result.In addition,the inclusions in the steel treated by the modified agent present a composite layer shape of MnS wrapped Al2O3,which is more beneficial to the removal of inclusions,and MnS is a plastic inclusion,which can reduce the negative effect of Al2O3 inclusions in steel.
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