帘线钢中夹杂物从铸坯到盘条的演变规律探讨  

Discussion on evolution law of inclusions intire cord steel from billet to wire rod

作　　者：吴园园 金传伟 张继明 麻晗 WU Yuanyuan;JIN Chuanwei;ZHANG Jiming;MA Han(Institute of Research of Iron&Steel,Shagang,Jiangsu Province,Zhangjiagang 215625,China)

机构地区：[1]江苏省(沙钢)钢铁研究院,江苏张家港215625

出　　处：《冶金分析》2025年第3期1-9,共9页Metallurgical Analysis

摘　　要：大尺寸不变形夹杂物是导致帘线钢在拉拔和合股过程发生断丝的主要原因之一,因此有必要研究帘线钢中夹杂物的类型及演变规律。文中利用聚焦离子束-电子束扫描电子显微镜(FIB-SEM)、能谱仪及三维重构软件系统研究了82A帘线钢从铸坯变化到盘条时钢中夹杂物的类型及形态演变规律。结果表明:帘线钢中的夹杂物主要由MnS类、MnS-SiO_(2)类和MnS-SiO_(2)-CaMgAlMnSiO类组成。铸坯中MnS类夹杂物平面形态多为椭圆形或近似圆形,盘条中MnS形态变为细长条形;铸坯中MnS-SiO_(2)类夹杂物平面形态以近似圆形的SiO_(2)为核心,外层包裹MnS,而盘条中形态仍保持以近似圆形的SiO_(2)为核心,外层包裹的MnS变为长条状,整体呈现“眼睛状”;铸坯中MnS-SiO_(2)-CaMgAlMnSiO类夹杂物平面形态以SiO_(2)为核心,包裹着富含Ca、Mg、Al、Mn、Si、O等元素的复合氧化物,最外层为MnS,盘条中SiO_(2)变形不明显,复合氧化物发生碎化,MnS被拉长,整体沿拉拔方向呈串状分布。夹杂物类型及形态的演变规律研究,为分析夹杂物的危害及高端帘线钢的开发提供工艺控制方向。Large non-deformable inclusions are one of the main causes of wire breakage for tire cord steels during drawing and stranding.Therefore,it is necessary to study the types and evolution law of inclusions in the tire cord steel.In the paper,the type and morphological evolution law of inclusions in 82A tire cord steel from billet to wire rod were investigated by the means of focused ion beam-electron beam scanning electron microscopy(FIB-SEM),energy disperse spectroscopy(EDS)and three-dimensional reconstruction software.The results showed that the main types of inclusions were MnS,MnS-SiO_(2)and MnS-SiO_(2)-CaMgAlMnSiO.The planar morphology of MnS inclusions in the billet were mostly elliptical or nearly round,while the morphology of MnS in the wire rod became elongated strip shape.The planar morphology of MnS-SiO_(2)inclusions in the billet had the core of nearly round SiO_(2),and the outer layer was wrapped MnS.In the wire rod,its morphology was still maintained in the nearly round SiO_(2)as the core,but the MnS wrapped on outer layer became long stripes,showing the overall appearance of"eye-shaped".The planar morphology of MnS-SiO_(2)-CaMgAlMnSiO inclusions in the billet was based on SiO_(2)as the core,which was wrapped with composite oxides enriched in Ca,Mg,Al,Mn,Si and O,and the outermost layer was MnS.In wire rod,the deformation of SiO_(2)was not obvious,and composite oxides became fragmented.Moreover,MnS was elongated,and the whole morphology showed string-like distribution along the drawing direction.The study on the evolution law of inclusions type and morphology provided process control direction for the analysis of inclusions harm and the development of high-end tire cord steel.

关 键 词：帘线钢 夹杂物 演变规律 形态 铸坯 盘条 三维重构 聚焦离子束-电子束扫描电子显微镜 

分 类 号：O657.62[理学—分析化学] O539[理学—化学] TF76[冶金工程—钢铁冶金]