Cold galvanized pipe is galvanized, galvanized very little amount of only 10-50g/m2, corrosion resistance and hot galvanized pipe itself is poor compared to too much, hot galvanized pipe formal manufacturers do not use galvanized, only those small factories with outdated equipment of small enterprises, will use electricity galvanized, the price is very cheap, is prohibited used in the water supply pipe, gas pipe.
Ji'nan galvanized pipe cold galvanized steel pipe, zinc layer and steel pipe matrix separate layer, zinc layer is thin, simply attached to the surface of steel tube is very easy to fall off, so corrosion resistance is very poor, and is prohibited in building housing.
Hot galvanized steel pipe adopts the new hot galvanizing process for zinc liquid steel and molten chemical reaction, the formation of Fe Zn alloy layer structure closely, and the pure zinc coating and the steel substrate. Therefore, the corrosion resistance is very strong.
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