Application of magnetic analyzers for detecting carburization of pyrolysis furnace tubes

Ethylene pyrolysis furnace is a key equipment in the ethylene production industry with tube being core component of system. The operates at high temperature (950°C–1,100°C) and hydrocarbon medium for long time, Cr35Ni45Nb centrifugal casting alloy material often chosen as tube. Due to its harsh working conditions, common failure issues include carburization, high-temperature creep cracking, thermal shock fatigue, overheating, expansion, bending, etc. Among them, carburization main cause failure. In this work, based on characteristics HP series (ASTM grade) material, which transformed from paramagnetic ferromagnetic following cracking different layer thickness has been prepared, coercivity tested by magnetic analyzer. relationship curve between subsequently studied find means test engineering. By fitting experimental data, rate reached 97%, turn verified validity accuracy method.