提高氧枪寿命工艺研究

STUDY ON TECHNOLOGY OF INCREASING OXYGEN LANCE LIFE

氧枪系统是转炉生产不可或缺的一部分。由于氧枪工作环境恶劣,工人操作失误,导致氧枪喷头变形漏水和枪身粘钢结瘤等问题时常发生。本文利用SEM表征,扫描电镜能谱和XRD对氧枪样品进行了分析。SEM表征分析说明,氧枪表面产生裂纹。样品经X射线衍射分析,得到其主要物相组成为Ni、Cr、Fe、Mn、Zn相互组成的氧化物。样品经扫描电镜能谱分析,基体和过渡层主要元素为Ni、Cr和Fe;但扫描电镜能谱分析结果显示氧枪表面镍含量为零,主要是Cr、Fe、Mn、Zn、O形成的化合物,与XRD物相分析结果一致。而镍是重要的合金化元素,能提高钢的强度和耐腐蚀能力。因此氧枪表面镍的消失,是直接导致氧枪产生裂纹的原因,进而降低了氧枪的使用寿命。所以优化结构设计和完善喷涂材料,以确保氧枪自身材料性能的稳定,从而提高氧枪的使用寿命,对实际生产起到一定指导意义。

BOF oxygen lance systems are an integral part of the production.Due to poor oxygen lance work environment,coupled with the misuse by workers,in the problems of deformation of oxygen lance which results in nozzle leaks and barrel stick by steel nodulation often occur.In this paper,characterized by SEM characterization,SEM and XRD spectra lance samples were analyzed.SEM characterization analysis shows that oxygen lance surface cracks.Samples analyzed by X-ray diffraction to obtain the main phase composed of Ni,Cr,Fe,Mn,Zn oxide of each component.SEM spectroscopy analysis showed that primary elements of the substrate and buffer layer are Ni,Cr and Fe;but SEM EDS analysis showed that the nickel content of the surface of the lance is zero,the formation being mainly Cr,Fe,Mn,Zn,O compounds,consistent with the results of XRD phase analysis.And nickel is an important alloying element,which can improve the strength and corrosion resistance of steel.The disappearance of nickel on the lance surface is the reason for resulting cracks,thereby reducing the life of the lance.Therefore,optimizing the structure design and perfect coating materials to ensure the stability of the lance material can increase the life of the lance.The study provides certain guidance for practice in actual production.