▎ 摘　　要

NOVELTY - The utility model claims a high heat-conducting plastic lined composite steel tube, comprising a steel pipe layer, the steel layer of the inner surface is at least provided with a high heat conducting lining plastic layer, the high heat-conducting lining plastic layer made of graphene-modified polyamide. The utility model has high heat conduction plastic lined composite steel tube has good mechanical property and thermal conductivity, can be applied to the geothermal steam, compressed air, liquid combustible gas and hydraulic system pipeline conveying field.