【作者】 姜敏； 王新华； 陈斌； 杨叠； 雷少龙； 王万军；

【Author】 Jiang Min~1 Wang Xinhua~1 Chen Bin~2 Yang Die~1 Lei Shaolong~1 Wang Wanjun~2 School of Metallurgical and Ecological Engineering,University of Science & Technology Beijing Beijing 100083; 2 State Key Lab of Advanced Metallurgy,University of Science & Technology Beijing Beijing 100083; 3 Research Institute of Technology of Shougang Group Beijing 100043)

【机构】 北京科技大冶金与生态工程学院； 北京科技大学钢铁冶金新技术国家重点实验室； 首钢技术研究院；

【摘要】 本文对超低氧特殊钢中非金属夹杂物控制技术展开了详细阐述。对于使用量大面广的低硫系列的超低氧系列特殊钢,可通过促进钢液-炉渣之间的化学反应,在Al强脱氧与高碱度高Al₂O₂含量炉渣精炼条件下,将T[0]、[S]含量控制在10ppm或以下,同时将夹杂物控制为微米尺寸级别、球形、低熔点钙镁铝酸盐类夹杂物:此类夹杂物具有一定变形能力,可有效提高疲劳性能。对于硫含量较高的超低氧特殊钢（对硫含量有下限要求或对切削性能有一定要求）,探索了在Al脱氧与高碱度炉渣精炼条件下,将T[0]含量控制在10ppm或以下的同时,通过抑制钢液-炉渣之间的反应,将钢中90%以上的夹杂物控制为较"软"的MnS,并利用较"软"的MnS夹杂物包裹较"硬"的Al₂O₃或Al₂O₃-MgO类氧化物形成具有良好变形能力的复合夹杂物:由于MnS具有很好的变形能力,因而此类复合夹杂物能够有效改善钢的抗疲劳性能并有助于改善切削性能;并初步分析了氧化物尺寸对复合夹杂物形成的影响。更多还原

【Abstract】 Control of non-metallic inclusion in extra low oxygen steel was discussed in details in present paper.It is proposed that different strategies should be used considering the sulfur contents in steel.For low oxygen steel needed deep sulfurization,high cleanliness and better control of inclusions can be realized by Al deoxidation and high basicity high alumina content slag refining,in which further reaction between slag and steel is very desirable thus should be proceeded.As a result,total oxygen and sulfur contents in steel could be decreased to less than 10ppm.And inclusions could be controlled to be spherical and lower melting temperature CaO-MgO-Al2O3 complex ones with smaller size,which are very helpful to improve fatigue resistance life span of steel.By comparison,inclusions in steel required certain amount of sulfur,for example,for improved machinability,should be controlled by different methods in which steel-slag reaction should be prohibited.Total oxygen content in steel can be reduced to as low as 10ppm or less.Simultaneously,most majority of the inclusions were plastic MnS with a percentage of over 90%while the other inclusions were mainly characterized by Al2O3 and Al2O3-MgO oxides in sever microns as the core wrapped by MnS softer layers,which are very positive to improve not only fatigue resistance properties but also machinability of steel.Effect of oxides size distribution on the formation of such complex inclusions was simply discussed.更多还原