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What is pre galvanized (GI) round steel pipe?

What is pre galvanized (GI) round steel pipe?
Update Time:2018-07-18
The pre-galvanized welded steel pipe refers to welded tube which undergoes decreasing, rust removal, phosphorization, and drying processes before galvanization.The treatments before galvanization allow the product to be conveniently plated with a zinc coating and also ensure uniform coating thickness, strong coating adhesion, and improved corrosion resistance