65Mn钢带表面红锈特征研究  

Study on Characteristics of Red Rust 65Mn Strip Steel Surface

作　　者：田余余 黄贞益[1] 曹燕[1] 马啸宇 王辉 TIAN Yuyu;HUANG Zhenyi;CAO Yan;MA Xiaoyu;WANG Hui(School of Metallurgy Science,Anhui University of Technology,Ma'anshan 243002,China)

机构地区：[1]安徽工业大学冶金学院

出　　处：《热加工工艺》2019年第23期110-112,115,共4页Hot Working Technology

摘　　要：某65Mn带钢表面红锈较为严重,影响材料的表面质量。本文采用扫描电子显微镜(SEM)及X射线衍射仪对氧化铁皮表面及截面的微观结构和形貌进行了分析,并结合Fe-O相图分析了轧制时表面氧化铁皮的形成过程。结果表明,65Mn钢表面氧化铁皮为多层结构,由内向外分别为Fe2SiO4层、疏松的FeO层、先共析组织Fe3O4和共析组织Fe3O4+α-Fe组成的多组分层、外表面的Fe2O3层。Si元素在氧化铁皮较厚的区域分布较富集,而Mn元素在氧化铁皮中由内层向外层含量逐渐增多。高温加热过程中,Si和Fe容易在氧化铁皮与钢基间生成层状的Fe2SiO4,导致氧化铁皮的剥离性不好。除磷后残留的FeO在后续轧制过程中氧含量达到过饱和状态生成Fe3O4,并进一步被氧化生成Fe2O3,所以钢带表面呈红锈状态。The red rust on the surface of a 65 Mn strip steel serious,which affects the surface quality of the material.The microstructure and morphology of the surface and cross section of iron oxide scale were analyzed by scanning electron microscope(SEM)and X-ray diffraction(XRD).The forming process of oxidized iron scale on surface during rolling was analyzed with Fe-O phase diagram.The results show that the oxidized iron scale on the surface of 65 Mn steel is a multilayer structure,from the inside to the outside are Fe2SiO4 layer,loose FeO layer,multicomponent layer of pre-eutectoid Fe3O4 and eutectoid microstructure Fe3O4+α-Fe,and Fe2O3 layer of outer surface.The distribution of Si element is more abundant in the thicker area of iron oxide,while the content of Mn element increases gradually from the inner layer to the outer layer in the iron oxide scale.During high temperature heating,Si and Fe are easy to form layered Fe2SiO4 between iron oxide and steel substrate,which leads to poor peel of iron oxide.The residual FeO after phosphorus removal reaches the supersaturated state in the subsequent rolling process to form Fe3O4,and it is further oxidized to form Fe2O3,so the surface of the steel strip is red.

关 键 词：65MN钢 热轧带钢 红色氧化铁皮 Fe-O相图 

分 类 号：TG316.192[金属学及工艺—金属压力加工] TG335.56