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. This paper finds that the early cracking of the active grate plate in the high temperature section of cement grate cooler is caused by thermal fatigue, which is the main reason that affects the early thermal fatigue cracking. The eutectic carbide, δ-ferrite in steel, the secondary carbides and σ phase precipitated during service, as well as the excess silicon and sulfur contents all contribute to the early thermal fatigue cracking.The new hot-rolled steel grate plate Has a high thermal fatigue resistance and wear resistance, made in the cement plant better results.