▎ 摘　　要

NOVELTY - Method for preparing heating tube, involves (a) uniformly spraying acid solution on inner surface of steel tube of metal material, washing and drying to obtain roughened steel tube, (b) adding phenolic resin to absolute ethanol, and uniformly stirring to form viscous liquid to obtain phenolic resin viscous liquid, (c) uniformly coating obtained phenolic resin viscous liquid on rough surface of steel pipe, and performing constant-temperature extrusion on phenolic foam plate on rough surface to obtain heat-insulating film-coated steel pipe, (d) adding aluminum oxide to obtained phenolic resin viscous liquid, and ultrasonically dispersing to obtain turbid liquid, and (e) laying graphene fiber web on inner surface of steel tube, coating suspension mucus on surface of graphene fiber web, and performing constant-temperature extrusion reaction for 2-4 hours to obtain the heating tube. USE - The heating tube is used for water heat tube detection device. ADVANTAGE - The method solves the problem of local temperature unevenness, forms the uniform discharge network, and adopts graphene high thermal conductivity to achieve temperature uniformity.