石油企业HP40Nb钢制氢转化炉炉管破裂分析

Analyze on rupture HP40Nb steel tubes from hydrogen production reformer furnace of petroleum company

采用宏观检查、化学成分分析、金相组织、扫描电子显微镜、力学性能测试方法对某石油公司制氢车间试车运行仅18h即发生破裂的HP40Nb钢制氢转化炉炉管进行了分析。结果表明:炉管破裂失效的主要原因是高温蠕变破裂,严重超温是导致蠕变发生的直接原因。

Hydrogen production reformer furnace tubes made of cast austenitic alloy steels serve in the temperature range of 1073—1173Kand pressure around 3—4MPa.Though the design life is about 100000 h,premature failures within 3—8years are more common,mainly caused by premature creep induced by overheating.The cast tube material undergoes microstructural changes with service exposure and as a consequence,degradation in strength. The methods of macro inspection,chemical analysis, microstructure,scanning electron microscope and mechanical properties testing were used to analyze on the rupture HP40Nb steel tubes from a hydrogen production reformer furnace of one petroleum company when they were used only 18hduring the test run.The rupture life was very short and needed to find the reason,in case the similar incidents.The results show that the reason of failure for the furnace tubes is high temperature creep rupture and over temperature seriously is the direct reason.