服役5年后乙烯裂解炉管的组织与性能研究  

Microstructure and Property of Pyrolysis Furnace Tubes Served for Five Years

作　　者：连晓明[1] 钱兵[1] 刘春娇[1] 陈学东[1] 陈涛[1] 

机构地区：[1]合肥通用机械研究院国家压力容器与管道安全工程技术研究中心中国石化炉管质量检测检验与评估中心,安徽合肥230031

出　　处：《压力容器》2016年第8期1-6,12,共7页Pressure Vessel Technology

基　　金：国家高技术研究发展计划(863计划)资助(2015AA034402)

摘　　要：采用场发射扫描电子显微镜、维氏硬度计和高温持久试验机等对服役5年后25Cr35NiNb＋微合金和35Cr45NiNb＋微合金炉管的组织与性能进行了研究。结果表明：经过5年的高温服役，25Cr35NiNb＋微合金炉管外壁时效区组织为G相（Ni16Nb6si7）和M23C6型碳化物，内壁渗碳区组织为颗粒状NbC和M7C3型碳化物；35Cr45NiNb＋微合金炉管外壁时效区组织为G相和M7C3型碳化物，内壁渗碳区组织为颗粒状、块状NbC、G相和M7C3型碳化物。相较于外壁时效区，两种材料内壁渗碳区硬度值升高约10％～15％，内壁渗碳后的炉管材料高温持久性能显著下降。The microstructure and properties of 25Cr35NiNb ＋ MA and 35Cr45NiNb ＋ MA alloy tubes served for five years were studied via field emission scanning electron microscope,Vickers hardness tester and high temperature rupture testers. The results show that after served for five years at high temperature, as for 25Cr35NiNb ＋ MA furnace tubes, the microstructure at aging zone near outer wall of the tubes were G phase （Ni16Nb6Si7） and M23C6 carbides,while the carburizing zone at the inner were NbC and MTC3 carbides. As for 35Cr45NiNb ＋ MA furnace tube, the microstructure at aging zone near outer wall of the tubes were G phase and M7 C3 carbides, while the carburizing zone at the inner were massive NbC, G phase and MTC3 carbides. Compared with the outer wall of the aging zone, the hardness value at carbu- rized zone near inner wall increased about 10% ~ 15% for both the two material tubes ,the high tempera- ture rupture performance decreased significantly from the furnace tube with the inner wall carburized.

关 键 词：乙烯裂解炉管 25Cr35NiNb+微合金 35Cr45NiNb+微合金 渗碳 组织 性能 

分 类 号：TH49[机械工程—机械制造及自动化] TQ055.8[化学工程]