裂解炉管初生碳化物分类及对高温持久性能影响

doi:10.3901/JME.2018.08.109

机械工程学报 ›› 2018, Vol. 54 ›› Issue (8): 109-116.doi: 10.3901/JME.2018.08.109

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裂解炉管初生碳化物分类及对高温持久性能影响

陈涛^1,2, 陈学东^1,2, 刘春娇^1,2, 钱兵^1,2

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合肥 230031;
2. 合肥通用机械研究院中国石化炉管质量检测检验与评估中心合肥 230031

收稿日期:2017-09-11 修回日期:2017-12-13 出版日期:2018-04-20 发布日期:2018-04-20
作者简介:陈涛,男,1976年出生,博士,教授级高级工程师。主要研究方向为高温耐热合金材料的基础应用。E-mail:chentao@hgmri.com
基金资助:
国家高技术研究发展计划（863计划，2015AA034402）资助项目。

Classification of Primary Carbides in Ethylene Pyrolysis Furnace Tubes and the Effects on High Temperature Rupture Performance

CHEN Tao^1,2, CHEN Xuedong^1,2, LIU Chunjiao^1,2, QIAN Bing^1,2

1. Hefei General Machinery Research Institute, National Engineering & Technical Research Center on Pressure Vessels and Piping Safety, Hefei 230031;
2. Hefei General Machinery Research Institute, Sinopec Inspection and Assessment Center on Furnace Tube, Hefei 230031

Received:2017-09-11 Revised:2017-12-13 Online:2018-04-20 Published:2018-04-20

摘要/Abstract

摘要： 研究离心铸造25Cr35NiNb+微合金和35Cr45NiNb+微合金乙烯裂解炉管初生碳化物分类及其高温持久性能。采用光学显微镜和扫描电镜观察分析了炉管原始铸态初生碳化物形态、分布和种类，采用高温持久蠕变试验机开展了试验温度900~1 100℃、试验应力12~45 MPa条件下的高温持久试验。结果表明：离心铸造炉管初生碳化物形态可归纳为正常和异常两种类型，正常初生碳化物为晶界骨架状、细条状Cr碳化物+短棒状、颗粒状NbC，异常初生碳化物为晶界团簇状、细颗粒状、点划线状Cr碳化物+团簇状NbC （或者G相）。正常初生碳化物炉管高温持久断裂时间显著长于异常的情况。最后，为了便于离心铸造炉管行业快速判断炉管高温持久性能，给出了正常和异常两种初生碳化物的对照图谱。

关键词: 初生碳化物, 高温持久性能, 乙烯裂解炉管

Abstract: For centrifugally cast 25Cr35NiNb+microalloy and 35Cr45NiNb+microalloy furnace tube, the morphology, distribution and type of primary carbides in original as-cast microstructure are analyzed by optical microscope and scanning electron microscope, and the high temperature rupture tests are carried out by using high temperature creep testing machine. The metallographic results show that the morphology of primary carbides in centrifugally cast furnace tube material can be divided into normal type, which refers to skeletal or fine strip Cr carbide + short rod or granular NbC in grain boundary, and abnormal type, which refers to cluster shape or fine granular or dash-dotted line like Cr carbide + cluster NbC (or G phase) in grain boundary. The high temperature rupture test results under the condition of 900-1 100℃ and 12-45 MPa stress level show that the rupture time of furnace tubes with normal type primary carbides are longer than those of abnormal type. Finally, the reference maps of normal type and abnormal type microstructure are offered to quickly estimate the high temperature performance of furnace tubes.

Key words: ethylene pryolysis furnace tube, high temperature rupture performance, original as-cast microstructure

中图分类号:

TB31

陈涛, 陈学东, 刘春娇, 钱兵. 裂解炉管初生碳化物分类及对高温持久性能影响[J]. 机械工程学报, 2018, 54(8): 109-116.

CHEN Tao, CHEN Xuedong, LIU Chunjiao, QIAN Bing. Classification of Primary Carbides in Ethylene Pyrolysis Furnace Tubes and the Effects on High Temperature Rupture Performance[J]. Journal of Mechanical Engineering, 2018, 54(8): 109-116.

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裂解炉管初生碳化物分类及对高温持久性能影响

Classification of Primary Carbides in Ethylene Pyrolysis Furnace Tubes and the Effects on High Temperature Rupture Performance

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