Corrosion is one of the most dangerous forms of damage to stainless steel – plastic composite pipes. Based on the analysis of the causes of intergranular corrosion of the steel-plastic composite pipe, the factors affecting intergranular corrosion of the steel-plastic composite pipe are summarized. A small amount of stabilized element titanium was added to increase chromium content and decrease nickel content. In 1050 ~ 1100 ℃ for solid solution treatment, rapid cooling, inhibition of precipitate in the grain boundary carbides; In 850 ~ 880 ℃ under 2 ~ 4 h, stabilizing treatment and then slowly cooling; In the case of cold working and rather sensitized temperature treatment. Ultra-high molecular weight polyethylene pipe itself has a very high resistance to impact, as to strengthen the protection layer of ms pipe can effectively prevent lining tube creep, more increased its ability against impact, pressure, bending, and strength, inspecting &controlling has better tolerance, steel composite tube is higher than common engineering plastics pipe to withstand water pressure, after testing can reach 6.4 Mpa, and ultra-high molecular weight polyethylene pipe is not afraid of knock against, the lining will not burst, especially suitable for the conditions of high voltage transmission line equipment. Inspecting &controlling good insulation thermal conductivity of the ultra-high molecular weight polyethylene tube is more than 1000 times less than steel, can significantly reduce pipe insulation requirements, its temperature performance in – 50 ℃ to 80 ℃ under the environment of using performance is good, for the cold fluid transportation is of great significance.

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