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对超临界机组高压加热器用TP304奥氏体不锈钢管的泄漏原因进行分析。结果表明,超临界机组高压加热器用TP304奥氏体不锈钢管的失效类型是应力腐蚀开裂。这种开裂一方面与温差导致的隔热板附近管子的塑性变形有关,另一方面也与高压加热器中的各种腐蚀因素有关。
The cause of leakage of TP304 austenitic stainless steel tube used for high pressure heaters in supercritical units was analyzed. The results show that the failure type of the TP304 austenitic stainless steel tube used for the high pressure heaters of supercritical units is stress corrosion cracking. On the one hand, this cracking is related to the plastic deformation of the pipe near the heat shield due to the temperature difference and on the other hand to the various corrosion factors in the high pressure heater.