The ethylene cracking tubes pack-carburized in a laboratory(P tube) and carburized during servicing in a cracking furnace (S tube) are studied.

对实验室固体渗碳（P管）和裂解炉运行渗碳（S管）的乙烯裂解管进行了研究。

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Field examination of tube fracture of ethylene cracking furnace for a certain ethylene plant is carried out. The fracture reason is researched. The repair proposal is put forward.

对某乙烯厂乙烯裂解炉炉管断裂进行了现场检测，探讨了断裂原因，提出了维修建议。

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