离心铸造25Cr35NiNb裂解炉管组织性能及热力耦合分析  

Microstructure,Properties,and Thermal Thermal Coupling Analysis of Centrifugal Casting 25Cr35NiNb Pyrolysis Furnace Tube

作　　者：胡鹏祥 朱守琴 简伟强 李丹 江克 HU Pengxiang;ZHU Shouqin;JIAN Weiqiang;LI Dan;JIANG Ke(College of Mechanical Engineering,Chaohu University,Hefei 238000,China)

机构地区：[1]巢湖学院机械工程学院,安徽合肥238000

出　　处：《河南科技》2025年第6期79-82,共4页Henan Science and Technology

基　　金：安徽省教育厅高等学校质量工程级项目“材料成型及控制工程卓越工程师教育培养计划”(2022zybj065);巢湖学院一流课程建设项目(ch19ylkc023);学生创新创业训练计划项目(S202310380063)。

摘　　要：【目的】分析乙烯裂解炉的重要材料离心铸造25Cr35NiNb的微观组织的形貌和分布对其力学性能和高温持久性的影响。【方法】通过OM、SEM和EDS分析离心铸造25Cr35NiNb裂解炉管的微观组织的形貌和分布;通过室温拉伸试验和高温持久试验,得到离心铸造25Cr35NiNb裂解炉管的力学性能和高温持久性。【结果】初生碳化物能提高裂解管的力学性能,并具有高温持久性;Ag和Cu的污染物会降低钢管的力学性能,在加工过程中需要避免;对裂解管的热力耦合分析发现,内径中间处变形最大。【结论】较好地预测了裂解管出现裂缝的位置,离心铸造25Cr35NiNb能够满足裂解管工作环境的要求。[Purposes]This paper aims to order to further understand the influence of the microstructural morphology and distribution of the key material for ethylene cracking furnace,centrifugally cast 25Cr35NiNb,on its mechanical properties and high-temperature creep resistance.[Methods]The microstructures and their distribution of the centrifugally cast 25Cr35NiNb pyrolysis furnace tubes were analyzed by means of OM,SEM and EDS;the mechanical properties and high-temperature creep resistance of the centrifugally cast 25Cr35NiNb pyrolysis furnace tubes were obtained through room temperature tensile tests and high-temperature creep tests.[Findings]The initial carbides can improve the mechanical properties of the cracking tube and have high temperature persistence;however,the impurities of Ag and Cu lower the mechanical properties of the steel tube and need to be avoided during processing;the thermal-mechanical coupling analysis of the pyrolysis tube reveals that the maximum deformation occurs at the center of the inner diameter.[Conclusions]The study accurately predicts the location where the pyrolysis tube cracks and the centrifugally cast 25Cr35NiNb can meet the requirements of the working environment of the pyrolysis tube.

关 键 词：离心铸造 初生碳化铬 高温持久性 热力耦合 

分 类 号：TG113[金属学及工艺—物理冶金]