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我厂650中轧车间三段连续式加热炉装炉总重量达60余吨,全部压在横向水平炉筋管上,该管材质为46钢。正常运行时是水、汽两相共存,炉内最高温度为1400℃。由于管壁用塑料包扎,推算出水管外壁温度不超过304℃。正常使用寿命为3～5年。 1981年7、8两个月,加热炉先后发生八次停炉事故,均为横向水管弯曲或爆裂造成的。其中高温区第二排横水管接连三次换新水管,均仍有不同程度的爆裂。经肉眼检查裂口有明显的塑性变形,且在裂口附近有减薄胀粗现象。管外壁有氧化皮,内壁干净无积垢。
I plant 650 three-stage continuous heating furnace furnace installed furnace weighing a total of more than 60 tons, all pressure in horizontal horizontal furnace tube, the pipe material is 46 steel. Normal operation is water, steam co-existence of two phases, the highest temperature in the furnace is 1400 ℃. As the wall with plastic bandage, calculate the outer wall temperature does not exceed 304 ℃. Normal life of 3 to 5 years. In 1981 and August two months, there were eight furnace shutdown accidents in the furnace, all caused by the bending or burst of horizontal water pipes. Among them, the second row of horizontal water pipes in the high temperature zone is replaced with new water pipes three times in succession, and there are still some different degrees of burst. The naked eye examination of the gap has obvious plastic deformation, and thinning in the vicinity of the gap expansion phenomenon. Outer tube oxide, the inner wall clean without scale.