耐火与石灰 ›› 2022, Vol. 47 ›› Issue (3): 27-29.

• 综述 • 上一篇    下一篇

低碳钢对渣线砖侵蚀机理的研究

李洪波   

  1. 上海利尔耐火材料有限公司, 上海200949
  • 出版日期:2022-06-10 发布日期:2022-05-18

Research on corrosion mechanism of low carbon steel on slag line brick

Li Hongbo#br#   

  1. Shanghai Lirr Refractory Materials Co.,Ltd., Shanghai 200949, China
  • Online:2022-06-10 Published:2022-05-18

摘要:

选取某钢厂电炉车间冶炼低碳钢用后渣线砖残砖,通过扫描隧道电子显微镜(SEM)和能谱仪(EDS)等方法,研究低碳钢对渣线砖侵蚀机理。结果表明: 渣线砖中的碳被渣中的FeO及环境中的O2氧化,外加在高温下MgO与C发生还原反应造成碳的脱除形成脱碳层,导致渣线砖结构疏松;随着脱碳层的形成,熔渣通过疏松的基质向脱碳层渗透,熔渣中钙硅酸盐相侵蚀方镁石晶界生成低熔点C2MS3,渣线砖周而复始发生氧化-脱碳-侵蚀。

关键词: 低碳钢, 渣线砖, 氧化, 侵蚀

Abstract:

The residual bricks of slag line bricks after smelting low-carbon steel in the electric furnace workshop of a steel plant were selected to study the corrosion mechanism of slag line bricks by low-carbon steel by scanning tunnel electron microscope (SEM) and energy spectrometer (EDS).The results show that the carbon in the slag line brick is oxidized by FeO in the slag and O2 in the environment,and the reduction reaction of MgO and C at high temperature causes the removal of carbon and the formation of a decarburization layer,resulting in the loose structure of the slag line brick;With the formation of the decarburization layer,the slag penetrates into the decarburization layer through the loose matrix,the calcium silicate phase in the slag erodes the periclase grain boundary to form low melting point C2MS3,and the slag line brick is oxidized,decarburized and eroded repeatedly.

Key words: Low-carbon steel grade, Slag line brick, Oxidation, Erosion

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