1 minute to teach you to use the naked eye to identify the real and fake hot-dip galvanized seamless steel pipe
Now there is a so-called hot-dip galvanized fluid pipe on the market, also called de-galvanized seamless pipe, in fact, it is a high-frequency welded pipe after treatment, the original weld with special equipment or planing off or grinding off and then galvanized. Now the identification of this kind of pipe