How to distinguish different types of galvanized steel pipe in the market
In general, according the raw materials of pipes, galvanized steel pipe has two categories: pre galvanized pipe and hot dipped galvanized steel pipe. In life, people are generally used to call the hot dipped galvanized pipe as galvanized pipe. The pre galvanized pipe refers to the welded pipe which has undergone degreasing, 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 improve corrosion resistance. Pre galvanized pipes are widely used in heat, water and natural gas supply systems, agricultural greenhouse construction field, steel structure construction field as well as low and medium pressure piping system.
Hot dipped galvanized pipe has been considered popular a lot among many users today. For one thing, the galvanization process protects the steel from rusting damage that can occur during transportation, installation and service. The zinc layer on the surface of pipe can form a barrier protection for steel products to extend the service life in applications. For the other thing, this layer is also resistant to wear and scratches, which makes the steel look more attractive. In a mill, hot dipped galvanized steel pipe will undergo the processing where there will formed a layer of alloy around the steel pipes due to the physical reaction between the molten zinc and iron. And the finished steel pipe finally has a stronger corrosion resistance than other common types of steel pipe. In addition, hot dipped galvanized steel pipe has a very uniform coating with strong adhesion property of zinc layer so as to greatly extend the service life of the pipes.
In view of production processing technology, galvanized steel pipe is divided into two kinds: electro galvanized steel pipe and hot dipped galvanized steel pipe. Roughly speaking, hot dipped galvanized pipe has more performance advantages than the electro galvanized pipe. However, due to the higher processing costs, the steel pipe price is a little more expensive than that of electro galvanized pipe. In recent years, because of the national policy, electro galvanized pipe has been eliminated from the steel market. Furthermore, compared with other ordinary types of steel pipes in the current steel pipe market, hot dipped galvanized steel pipe has obvious advantages in a wide range of actual purposes in life.
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