一、前言在石油化学工业中,乙烯裂解、加氢重整,氢加热等系统的工作环境是一个高温、低氧势、高碳势的碳氢混合气体腐蚀环境,具有很强的侵蚀性。高温炉管在这种环境下极易产生渗碳破坏。渗碳是由于碳氢化合物的裂解和分解释放出来的活性碳原子在管壁的吸附,向合金基体的渗透和扩散,引起合 I. Introduction In the petrochemical industry, the working environment of ethylene cracking, hydrogen reforming, hydrogen heating and other systems is a corrosive environment of hydrocarbon mixed gas with high temperature, low oxygen potential and high carbon potential, which is highly corrosive. High-temperature furnace tube in this environment can easily produce carburizing damage. Carburization is due to hydrocarbon cracking and decomposition of activated carbon atoms released in the pipe wall adsorption, infiltration and diffusion to the alloy matrix, causing co-