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在分析测试服役HP耐热钢裂解炉管的基础上，探讨了使用过程中炉管内壁材质的弱化机制、结果表明，炉管内壁亚表层贫碳化物区及内部渗碳区的形成及加深主要与表面氧化层的剥落和重建、晶间氧化区的形成、碳及合金元素在基体中的扩散速度以及形成碳化物的临界碳浓度cmax密切相关；丝状催化焦炭的形成与发展促进了炉管内壁组织弱化，而非催化气相焦炭的沉积在一定程度上抑制了材料的弱化；反复的结焦和清焦是促使炉管内壁材质弱化的主要原因.
On the basis of analyzing and testing HP heat-resisting steel cracking furnace tubes, the weakening mechanism of the inner wall materials of the furnace tubes is discussed. The results show that the formation and deepening of subsurface lean carbide areas and internal carburizing zones And the surface oxide layer spalling and reconstruction, the formation of intergranular oxidation zone, carbon and alloying elements in the matrix diffusion rate and the formation of carbide critical carbon concentration cmax is closely related to the formation and development of filamentous catalytic coke promote the furnace tube Wall tissue weakened, while the non-catalytic gas-phase coke deposition to some extent inhibited the material weakening; repeated coking and defocusing is to promote the material of the inner wall of the main reason weakened.