Brighten : Brighten steel pipe is made of brighten annealed steel strip ( a kind of material corresponding to CR.) Similar with black tube made of cold rolled coil, brighten steel pipe keeps the original brighten color of steel. * Hot dipped galvanized: Hot dipped galvanized tube owns thicker zinc coating than pre-galvanized tube. Black tubes will be dipped into zinc pool for galvanizing.
* Electro galvanized: The technology of electro galvanized tube is similar to hot dipped galvanized tube, but the thickness of zinc coating is less than hot dipped galvanized tube. * Pre-galvanized: Pre-galvanized tube is made of hot dipped galvanized steel strip directly
* Painted :Painted pipe to remove the rust and clean the oil first and then paint the required color paint.
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