中间包镁质挡渣墙开裂破损过程及机理分析

耐火与石灰 ›› 2020, Vol. 45 ›› Issue (6): 30-34.

中间包镁质挡渣墙开裂破损过程及机理分析

王洛杨峥刘自民饶磊王俊北樊明宇

马鞍山钢铁股份有限公司技术中心, 马鞍山243000

出版日期:2020-12-10 发布日期:2021-03-12

Cracking and damage process and mechanism analysis of magnesium slag dam in tundish

Wang Luo Yang Zheng Liu Zimin Rao Lei Wang Junbei Fan Mingyu

Ma’anshan Iron & Steel Co.,Ltd., Ma’anshan 243000, China

Online:2020-12-10 Published:2021-03-12

摘要/Abstract

摘要： 为了解中间包镁质挡渣墙开裂破损的原因，本文采用X射线衍射、扫描电镜等检测手段对挡渣墙浇注料预制件的常温物理性能、物相组成、热震稳定性和抗渣性能等进行检测分析。结果表明，钢水和熔渣沿中间包挡渣墙的气孔和裂纹渗透，在侵蚀、渗透层中镁橄榄石和熔渣反应生成低熔点的钙镁橄榄石或镁蔷薇辉石等。同时，熔渣进入耐火材料导致渗透层和原质层成分不同，热胀冷缩不一致，导致生成大量裂纹，加剧了挡渣墙开裂损毁。

关键词: 挡渣墙, 热震稳定性, 渗透, 开裂损毁

Abstract:

In order to understand the causes of cracking and damage of magnesium slag dam in tundish，the physical properties，phase composition，thermal shock resistance and slag resistance of castable preforms for slag dam at room temperature were detected and analyzed by X-ray diffraction，scanning electron microscope and other detection methods.The results show that molten steel and slag infiltrate along the pores and cracks of the slag dam of the tundish，and forsterite and slag react in the erosion and infiltration layer to form low melting point monticellite or magnesium rhodonite，etc.At the same time，the molten slag infiltrating in the refractory material causes the composition of the infiltration layer and the original layer to be different，and the thermal expansion and cold contraction are inconsistent，resulting in separation and cracking，which generates a large number of cracks and intensifies the cracking damage of the slag dam.

Key words: Slag dam, Thermal shock resistance, Infiltration, Cracking damage

中图分类号:

TQ175.713

王洛杨峥刘自民饶磊王俊北樊明宇. 中间包镁质挡渣墙开裂破损过程及机理分析[J]. 耐火与石灰, 2020, 45(6): 30-34.

Wang Luo Yang Zheng Liu Zimin Rao Lei Wang Junbei Fan Mingyu. Cracking and damage process and mechanism analysis of magnesium slag dam in tundish[J]. REFRACTORIES & LIME, 2020, 45(6): 30-34.

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