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。
The carburizing damage of HP type ethane cracking tubes after 40000hours of service is analysed using metallographic methods, and the tensile and creep rupture tests are conducted.
对运行了4万h的HP型乙烷裂解炉管的渗碳损伤进行了金相分析，并测定了炉管的力学性能。
It showed that a fast cooling after drawing was of benefit to dimensional stability, straightness, environmental stress cracking resistance, and strength of the drawn tubes.
拉伸时的自然冷却会产生不均匀的产品，快速水冷却拉伸工艺能显著改善管的耐环境应力开裂性，成倍提高其强度。
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