摘要
帘线钢主要用于制作轮胎骨架和切割硅片的线锯,其中主流切割钢丝的直径已经达到了47μm。夹杂物的大小、变形能力对帘线钢拉拔过程中的断丝率极为关键。为了提高帘线钢中夹杂物的变形能力,通过向钢液中添加碱金属氧化物以变质钢中夹杂物,从而获得塑性良好的低熔点夹杂物。向帘线钢中分别添加了吨钢质量分数为0.3%、0.5%、1.0%的Na2CO3、K2CO3、B2O3,共冶炼了9炉钢,对产品取样并用扫描电镜观察夹杂物形貌和统计成分。FactSage(FactPS+FToxid数据库)相图计算和试验结果表明,随着帘线钢中Na2CO3加入量的增加,夹杂物中铝含量逐渐降低,当Na2CO3加入吨钢质量分数为0.5%时,钢中绝大部分夹杂物落在低熔点区域;随着帘线钢中K2CO3加入量的增加,夹杂物中硅含量逐渐降低,当K2CO3加入吨钢质量分数为0.5%时,钢中绝大部分夹杂物落在低熔点区域;钢中加入B2O3后,夹杂物为SiO2-MnO-Al2O3夹杂物或以SiO2-MnO-Al2O3为核心、外围包裹BN的夹杂物,硼元素并不能溶解到夹杂物中对夹杂物进行塑性化改质。
Cord steel is used for making tire frames and wire saws for cutting silicon wafers. The diameter of mainstream cutting wire has been developed to 47 μm. The size and deformation ability of inclusions are very important to the wire breaking rate of cord steel during drawing process. In order to improve the deformation ability of inclusions in cord steel respectively, alkali metal oxide is added into the molten steel to improve the inclusions in the steel, so as to obtain good plastic low melting point inclusions. Mass fraction per ton of 0.3%, 0.5% and 1.0% Na2CO3, K2CO3and B2O3were added into cord steel respectively, which were smelted 9 furnaces, and the morphology and composition of inclusions were observed by SEM-EDS. FactSage phase diagram calculation and experimental results show that, with the increase of Na2CO3content in cord steel, the aluminum content in inclusions gradually decreases. When the mass fraction of Na2CO3is 0.5% per ton, most of the inclusions in the steel fall in the low melting point region. With the increase of K2CO3content in cord steel, the silicon content in inclusions decreases gradually. When the mass fraction of K2CO3is 0.5% per ton, most of the inclusions in the steel fall in the low melting point region. After adding B2O3, the inclusions in steel are SiO2-MnO-Al2O3inclusions or inclusions with SiO2-MnO-Al2O3as the core and BN wrapped around. Boron cannot be dissolved into the inclusions for plastic modification.
作者
赵家七
麻晗
王德永
蔡小锋
马建超
侯栋
ZHAO Jia-qi;MA Han;WANG De-yong;CAI Xiao-feng;MA Jian-chao;HOU Dong(Jiangsu Shagang Iron and Steel Research Institute Co.,Ltd.,Zhangjiagang 215625,Jiangsu,China;School of Iron and Steel,Soochow University,Suzhou 215000,Jiangsu,China)
出处
《中国冶金》
CAS
CSCD
北大核心
2023年第3期68-76,共9页
China Metallurgy
基金
国家自然科学基金资助项目(51874203,51804205)
中国博士后科学基金资助项目(2022M721412)。
关键词
夹杂物
热力学计算
碱金属
LF精炼
帘线钢
inclusions
thermodynamic calculation
alkali metals
LF refining
cord steel
