摘要
本文发现水泥窑篦冷机高温段活动篦板的早期开裂是热疲劳引起的,疏松是影响早期热疲劳开裂的主要原因。钢中的共晶碳化物、δ—铁素体、服役过程中析出的二次碳化物和σ相以及过量的硅和硫含量都促进早期热疲劳开裂.作者研制的新型耐热钢活动篦板具有较高的热疲劳抗力和耐磨性,在水泥厂取得了较好的使用效果.
In this paper it is found that the early failure of movable grates in high temperature zone in the cement kiln cooler is due to a kind of thermal fati- gue.The shrinkage porosity is a primary factor influencing the early ther- mal fatigue failure.Eutectic carbides,δ-ferrites in the steels,secondry carbides,σ phases precipitating in work,and excessive sF and S contents promote it.The new type of heat resistant steel movable grates developed by the authors have higher resistanceve to thermal fatigue and abrasion and find better application in cement mills.
基金
国家七五攻关项目的一部分
关键词
水泥窑
篦冷机
篦板
开裂
失效
grate
failure analysis
heat resistant steel
