铬钼系列抗腐蚀钢管的组织及析出相分析  

Analysis of Microstructure and Segregation Phase of Corrosion Resistant Cr-Mo Steel Pipe

作　　者：孙宇[1] 张志远[1] 韩丽华[1] 张冰[1] 宁玫[1] 李志群[1] 卢弘[1] 

机构地区：[1]天津钢管集团股份有限公司,天津300301

出　　处：《钢管》2011年第6期43-48,共6页Steel Pipe

摘　　要：主要研究了铬钼系列抗腐蚀钢连铸圆坯成分偏析,以及调质态钢管的微观组织和物相组成。研究结果表明,连铸圆坯芯部成分偏析较严重,晶界偏聚块状硫化物,而碳氮化物在偏析区沿晶分布,成分偏析区硬度大于基体部位。铸坯芯部成分偏析区的Mo、Cr、Mn、C、V含量明显高于基体部位。调质态钢管析出相X射线衍射分析表明,析出相主要包括M3C、Mo2C、M7C3、MC以及少量的M23C6。透射电镜分析显示,钢管基体部位析出相除M3C相外,还可能含有M7C3,内壁带状偏析区层片状析出相为Cr15.58Fe7.42C6,六边形相是Mo2C。The composition segregation of the continuous cast round billets and the microstructure and phase composition of the quenching and tempering treated steel pipes made from the corrosion resistant Cr-Mo steel are investigated. The results reveal that there is some obvious composition segregation occurred at the center of the billet, some lump sulfides segregated at the grain boundary and some carbon-nitrides distributed along the intergranular structure in the segregation area, with the hardness of the segregation area higher than that of the matrix. At the center of the billet, the contents of such chemical composition as Mo, Cr, Mn, C and V in the segregation area are obviously higher than those in other area. The segregation phase analysis of the quenching and tempering treated steel pipes using a X-Ray Diffractometer indicates that M3C, MO2C, M3C2 and MC are mainly contained in the segregation phase only with little M23C6 in it. The analysis using the Transmission Electron Microscopy shows M7C3 may also contained in the segregation phase of the steel pipe matrix in addition to M3C, the layered tablets phase is Cr15.58Fe7.42C6 and the regular hexagon phase is MO2C in the pipe inner wall.

关 键 词：钢管 铬钼低合金钢 抗腐蚀 显微组织 相分析 

分 类 号：TG142.33[一般工业技术—材料科学与工程]