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针对含铝冷镦钢在浇铸过程中的塞棒异常侵蚀问题,通过塞棒基体成分分析、塞棒侵蚀层的元素分布观察以及热力学计算,探究了含铝冷镦钢生产过程中塞棒侵蚀的成因,并提出相应的改善措施。结果表明,钢中高质量分数的钙与耐火材料中的Al_2O_3、SiO_2、C发生反应,生成低熔点钙铝酸盐或硅铝酸盐以及Al_2O_3-C质塞棒本身材质中C+SiC的质量分数过高是造成含铝冷镦钢浇铸过程中塞棒严重侵蚀的主要原因,通过规范钙处理工艺、更换镁碳质塞棒等措施,能够显著改善塞棒的异常侵蚀问题,塞棒的使用寿命由286~824 min提升至460~1 020 min,平均使用寿命由原来的495 min上升至802 min。
Aiming at the abnormal erosion of stopper rod in aluminum-bearing cold heading steel during casting process, the corrosion of stopper rod in the production process of aluminum-bearing cold heading steel was investigated by the analysis of the matrix composition of stopper rod, the elemental distribution of stopper erosion layer and the thermodynamic calculation Causes, and put forward corresponding improvement measures. The results show that the high-quality calcium in the steel reacts with Al 2 O 3, SiO 2 and C in the refractory to form the low melting point calcium aluminate or aluminosilicate and the mass fraction of C + SiC in the Al 2 O 3 -C plug itself Too high is the main reason for the serious erosion of the stopper rod in the casting process of the aluminum-containing cold heading steel. By regulating the calcium treatment process and replacing the magnesium carbon stopper rod, the problem of abnormal erosion of the stopper rod can be remarkably improved, and the service life of the stopper rod From 286 to 824 min to 460 to 1 020 min, the average service life increased from 495 min to 802 min.