MnS在Ti-Al复合脱氧氧化物上的析出研究

来源期刊：钢铁2010年第11期

论文作者：杨成威 吕迺冰 卓晓军 王新华 王万军

文章页码：32 - 36

关键词：MnS； 氧化物冶金； 析出； Ti-Al复合脱氧

Key words：MnS； oxide metallurgy； precipitation； Ti-Al complex inclusion

摘    要：采用高温电阻炉,通过改变不同冷却条件和不同硫含量,系统研究了Ti-Al复合脱氧夹杂对MnS夹杂物析出量和形貌的影响。试验结果表明:冷却速率对MnS的析出有着重要的影响。当钢液中硫的质量分数从0.001%增加到0.01%时,在炉冷条件下,MnS析出量随着钢液中硫含量的增加而增加。但是在水冷条件下,MnS的析出量不随钢液中硫含量的增加而变化。当钢液中w([S])>0.008%时,所有氧化物夹杂表面都会析出MnS夹杂;当0.002%≤w([S])<0.008%时,复合氧化物夹杂中MnO+SiO₂含量越高,MnS越容易在氧化物上面析出。复合夹杂物中Ti₃O₅和Al₂O₃对MnS的析出没有明显影响。当w([S])<0.002%时,基本没有MnS夹杂析出。MnS在低熔点氧化物上呈镶嵌状析出,在高熔点上呈包裹状析出。

Abstract: The phenomenon that MnS inclusion precipitates on surface of Ti-Al de-oxidation complex inclusion was studied systematically in lab by utilizing resistance furnace.The effect of Ti-Al complex inclusions on MnS precipitation amount and morphology was investigated by varying the cooling rate and the content of S in steel.The experiments demonstrate that the cooling rate on the precipitation of MnS has a significant impact.When the S content in liquid steel from 0.001% to 0.01%,under the furnace cooling conditions,MnS precipitation amount as the S content in liquid steel increases.However,in water-cooled conditions,MnS precipitation is no change with increase in S content of liquid steel.When the w([S])>0.008%,all the surface of oxide inclusions are precipitated MnS inclusions;when 0.002% ≤w([S])<0.008%,the higher the composite oxide inclusions in the(MnO +SiO₂) content,more easily MnS in the oxide above the precipitation.No obvious affect of Ti₃O₅ and Al₂O₃ is found on MnS precipitation on complex inclusions.When w([S])<0.002%,no MnS inclusions are precipitated.In the low melting point oxides,MnS takes on mosaic-like precipitation.In the high melting point oxides,MnS is encapsulated.