低碳低合金钢塞棒侵蚀机理研究及改进

炼钢 ›› 2022, Vol. 38 ›› Issue (4): 71-77.

低碳低合金钢塞棒侵蚀机理研究及改进

赵家七¹,麻晗¹,马建超¹,蔡小锋¹,李解²

1．江苏省（沙钢）钢铁研究院，江苏张家港 215625；
2．江苏沙钢集团有限公司转炉炼钢厂，江苏张家港 215625

出版日期:2022-08-05 发布日期:2022-07-29

Research on stopper rod corrosion mechanism and improvement for low-carbon and low-alloy steel

Online:2022-08-05 Published:2022-07-29

摘要/Abstract

摘要： 针对SAE系列低碳低合金钢在浇铸过程中出现塞棒头异常侵蚀问题，通过塞棒的物相分析及元素分布，研究塞棒的侵蚀机理，并提出相应的改进措施。结果表明，塞棒头中的碳含量高，与钢水中的氧反应，形成塞棒头表层脱碳层。钢水中高SiO₂组分的夹杂附着在塞棒头表层，与塞棒头本体耐材中的MgO、MgO·Al₂O₃反应，生成Mg₂SiO₄类的低熔点相，在钢水冲刷作用下被带入钢水，造成塞棒头侵蚀。通过选用低碳、高致密度且含适量SiC的塞棒头，提高炉渣碱度和降低钢水氧含量，塞棒头侵蚀问题显著改善，中包连浇炉数由8～10炉提高至15炉以上。

关键词: 低碳低合金钢, 塞棒侵蚀机理, 钢水可浇性

Abstract: In view of stopper rod abnormal erosion of SAE series low-carbon and low-alloy steel during casting process, stopper rod erosion mechanism and corresponding improvement measures were proposed through phase analysis and element distribution. The results show that the high carbon component in stopper rod reacts with the oxygen in molten steel to form a decarburized layer on the surface of stopper rod. The inclusions with high Si_O2 component in molten steel adhere to the surface of stopper rod, react with MgO, MgO·Al₂O₃, and form low melting point phase of Mg₂SiO₄ type, which is brought into molten steel under the action of molten steel, causing corrosion of stopper rod. The abnormal corrosion of stopper rod was significantly improved by selecting stopper rod with low carbon, high density and appropriate amount of SiC, increasing basicity of slag and reducing oxygen content in molten steel, and the number of tundish continuous casting furnaces increased from 8-10 furnaces to more than 15 furnaces.

Key words: low-carbon and low-alloy steel, corrosion mechanism of stopper rod, molten steel castability

赵家七, 麻晗, 马建超, 蔡小锋, 李解. 低碳低合金钢塞棒侵蚀机理研究及改进[J]. 炼钢, 2022, 38(4): 71-77.