工业纯铁铝氧含量控制工艺  

Control process of Al and O content in industrial pure iron

作　　者：刘建民 姜彩伟 胡显军 顾晔 LIU Jianmin;JIANG Caiwei;HU Xianjun;GU Ye(Experimental Workshop,Research Institute of Iron and Steel,Shasteel,Zhangjiagang 215625,Jiangsu,China)

机构地区：[1]江苏省(沙钢)钢铁研究院实验工场,江苏张家港215625

出　　处：《中国冶金》2023年第9期87-95,共9页China Metallurgy

摘　　要：为了降低金刚线芯线用高碳钢盘条拉拔断丝率,控制其氧化铝夹杂物含量,提供满足要求的纯铁,研究了工业纯铁铝氧含量控制工艺。利用真空感应炉并采用双炉次熔炼工艺进行研究,其中第1炉次通过氧铝反应脱铝,设计了两种熔炼方案,分析了氧化铁加入量、氧化铁加入前炉内压力对纯铁液中铝氧含量的影响情况。结果表明,氧化铁加入量为300 g、氧化铁加入前炉内压力为0.1 MPa时,纯铁液内铝质量分数可降低至0.001%以内。第2炉次通过碳氧反应脱氧,研究了碳加入量对纯铁液中铝氧含量的影响情况。结果表明,碳加入量为0.03%时,纯铁液中铝质量分数低于0.002%、氧质量分数低于0.001%。对相关样品夹杂物情况进行统计分析发现,经氧脱铝及低碳脱氧过程的纯铁中夹杂物数量和尺寸大幅降低,没有尺寸大于10μm的夹杂物,含氧化铝夹杂物基本消失,而高碳脱氧不利于夹杂物的脱除。该工艺用于高品质金刚线芯线的低铝低氧且夹杂物水平较低的原料制备,丰富了工业纯铁的提纯技术。In order to reduce the wire breakage rate during drawing of high carbon steel wire rods for diamond core wire,control the content of aluminum oxide inclusions,and provide pure iron that meets the requirements,control process of aluminum and oxygen content in industrial pure iron was studied.Using vacuum induction furnace and dual furnace smelting process,for the first heat,two smelting schemes were designed to remove aluminum through the oxygen aluminum reaction.The influence of furnace pressure before adding iron oxide and the addition amount of iron oxide on the aluminum and oxygen content in pure iron liquid were studied.The results show that when the addition amount of iron oxide is 300 g and the furnace pressure before adding iron oxide is 0.1 MPa,the aluminum mass fraction in pure iron liquid can be reduced to within 0.001%.The second heat is deoxidized through carbon oxygen reaction.The effect of carbon addition amount on the content of aluminum oxygen in pure iron liquid was studied.The results show that when the carbon addition amount is 0.03%,the aluminum mass fraction in pure iron liquid decreases to within 0.002%and the oxygen mass fraction decreases to within 0.001%.Statistical analysis was conducted on the inclusion of samples.It is found that the number and size of inclusions in pure iron through oxygen dealumination and low carbon deoxidation processes are significantly decreased with no inclusions larger than 10μm,while inclusions containing aluminum oxide basically disappear.However,high carbon deoxidation is adverse to the removal of inclusions.This process provides raw materials with low aluminum,low oxygen,and low inclusion levels for high-quality diamond core wire enriching the purification technology of industrial pure iron.

关 键 词：真空感应炉 纯铁 铝 氧 夹杂物 金刚线芯线 

分 类 号：TF56[冶金工程—钢铁冶金]