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通过宏观分析、硬度测量、金相组织观察和成分分析,对某电厂炉水冷壁15CrMoG管进行爆管原因分析。结果表明:管样化学成分分析结果符合GB 5310-2008中15CrMoG材料化学成分的要求;1#管样爆口处金相组织为铁素体+珠光体,晶粒呈拉伸纤维状。爆口及爆口附近金相组织为铁素体+珠光体;爆口及爆口附近管件截面显微硬度高于标准要求(ASTM A213/A213M-2013,≤170 HV),爆口处显微硬度高达240 HV0.2;室温拉伸试验结果符合GB5310-2008标准中15CrMoG材料的要求。结合现场实际情况,推测水冷壁管短时过热泄漏原因为水冷壁管内工质减少引起的,建议检查引起流量减小的原因。
Through macroscopical analysis, hardness measurement, microstructure observation and composition analysis, the pipe burst analysis of 15CrMoG pipe in water wall of a power plant was carried out. The results show that the chemical composition analysis results of pipe samples are in accordance with the chemical composition of 15CrMoG in GB 5310-2008. The microstructure of 1 # pipe samples is ferrite + pearlite, and the crystal grains are in the form of drawn fibers. The microstructure near the breach and explosion is ferrite + pearlite. The micro-hardness of the cross-section near the breach and breach is higher than the standard (ASTM A213 / A213M-2013, ≤170 HV) Hardness up to 240 HV0.2; tensile test results at room temperature in line with GB5310-2008 standard 15CrMoG material requirements. Combined with the actual situation on the scene, it is speculated that the reason for the short-term overheating of the water-cooled wall tube is due to the reduction of the working fluid inside the water-wall tube. It is recommended to check the reason for the decrease of the flow rate.