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某厂的电阻加热炉运行约半年(实际累计仅161小时),在不锈钢盘管弯管处破裂而引起氢气泄漏、燃烧事故。其材质为1Cr18Ni9Ti不锈钢,φ35×3.5mm,三组。设计使用温度300℃,操作压力60kgf/cm~2。管内物料为橡胶防老剂的半成品4-氨基二苯铵、氢气及丙酮等。管外侧保温填料用珍珠岩粉。本文通过光学金相扫描电镜、俄歇电子能谱等检测手段,对电阻加热炉盘管失效原因进行了试验分析。一检验 1 化学分析及机械性能失效管(带有黑色氧化皮)和正常管(保持不锈钢本色)的化学成份、机械性能结果列于表1。由表1可见,前者的抗拉强度、延伸率显著降低,后者则均符合技术要求。
A factory resistance furnace operation for about six months (the actual cumulative only 161 hours), the stainless steel coil pipe rupture caused by hydrogen leaks, burning accident. The material is 1Cr18Ni9Ti stainless steel, φ35 × 3.5mm, three groups. Design temperature 300 ℃, operating pressure 60kgf / cm ~ 2. Tube material for the rubber antioxidant semi-finished 4-aminodiphenylammonium, hydrogen and acetone. Tube insulation filling with perlite powder. In this paper, through the optical metallographic scanning electron microscopy, Auger electron spectroscopy and other means of detection, the cause of the failure of the resistance heater coil experiments were analyzed. A test 1 chemical analysis and mechanical failure of the tube (with a black oxide) and normal tube (stainless steel to maintain the true color) of the chemical composition, the results are shown in Table 1. Can be seen from Table 1, the former tensile strength, elongation significantly reduced, while the latter are in line with technical requirements.