C330/N350-17.75/0.981/545/545 型330MW 中间再热凝汽式汽轮机螺栓热紧说明书南京汽轮电机（集团）有限责任公司Z726.03/113Z726.03/112Z726.03/1131-1 热紧螺栓的范围1 热紧螺栓的范围高中压内、外缸所用的大直径螺栓，应按本说明书要求进行热紧，以确保接合而有足够的预紧力，从而保证初爼的密封性。需要热紧的螺栓见下表：Z726.03/11Z726.03/117Z726.03/116Z726.03/111-4 热紧数据1 热紧数据（高斥内缸〉螺栓直径 X 长度 20CrlHolVNbTiB螺栓材料螺母材料热紧伸长值 nnn螺母转角度螺母外径IHD螺母沿外径旋转弧长 mm螺栓加热温度°C预冷紧力矩Kgf.m1-4M160X4X125020CrlMolHiBA25Cr2MoVA1.581424>235.0291251.26005-7M130X4X105020CrlMolHiBA25Cr2MoVA1.741574>185.0253.52335408M120X4X82020CrlMolHiBA25Cr2MoVA1.25112.74>170.0167.12864609-10M100X4X77025Cr2MoVA35CrMoA1.37123.1心 145.0155.830732011-12M90X4X75025Cr2MoVA35CrMoA0.872心 13081.3221259砌母外径为螺母最外圆直径螺栓热紧顺序Z726.03/11
