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塑料具有很高的抗酸、抗硷和抗蚀性能,如聚氯乙烯除强酸外几乎在所有酸和各种浓度的盐溶液作用下都很稳定。但塑料强度低致使在某些方面不能取代金属管材。但如把塑料衬在强度好的钢壳内就可以扬长去短地应用在化学、石油、国防等工业部门,成功地代替各种合金钢管和有色金属管。衬塑料钢管的生产方法现在有冷拔和热合等方法,前者是将塑料管套入钢管内,再一
Plastics have high acid, alkali and anti-corrosion properties, such as PVC, in addition to strong acid almost all the acid and various concentrations of salt solution is very stable. However, the low strength of the plastic does not in some ways replace the metal pipe. However, if the plastic lined steel in good strength can go short to short in the chemical, petroleum, national defense and other industrial sectors, the successful replacement of a variety of alloy steel pipe and non-ferrous metal pipe. Lining plastic pipe production methods are now cold drawing and heat sealing and other methods, the former is the plastic pipe into the pipe, and then a