Corrosion of ERW steel pipe

　　ERW steel pipe outer coating of the basic functions,there are two aspects:

　　First,make the ERW steel pipe surface from electrochemical corrosion,bacterial corrosion protection of soil basic physical media. Second,resist the soil medium move creep stress,basic mechanical protection method static sterss and abrasion strength and structure and so on.

　　The basic principles of the outer coating selected city gas pipeline:

　　a,good insulation properties and mechaniacal properties;

　　b,good resistance to cathodic disbanding performance;

　　c,good resistance to water,gas permeability;

　　d,good chemical resistance properties of soaking and aging;

　　e,low tempercature and high temperature performance;

　　f,easy mending and mending;

　　g,the price is reasonable.

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