classification of galvanized seamless pipes

Generally speaking, the galvanized seamless pipe is divided into cold plated steel seamless pipe and hot dip seamless pipe.

Cold Galvanized Seamless Pipe
The cold galvanized (also called electro-galvanized) has smaller resistance to corrosion than hot dip galvanized pipe. In order to make sure the high quality, lots of regular galvanized pipe manufacturers do not utilize cold-plated galvanized. Only in the small scaled and small businesses, the manufacturer will adopt the electric galvanized to save the cost. Certainly, the prices of seamless pipes are relatively cheap. So the Ministry of Construction has formally abolished the cold-plated galvanized pipe to eliminate backward technology and prohibit the cold galvanized pipe for water or gas.

Galvanized Seamless Steel Pipe


Hot Dip Seamless Pipe
The hot dip seamless pipe is to make the molten metal and iron substrate reaction and the alloy layer so that the substrate and coating can be combination. Hot dip galvanized is the steel pickling so as to remove the steel pipe surface of iron oxide, pickling, aqueous solution of ammonium chloride or zinc chloride mixed aqueous solution tank cleaning, then send into the hot dip tank. Hot dip galvanized coating uniformity, strong adhesion and long service life.

The Mechanical Properties of Galvanized Seamless Pipe
The steel mechanical properties make the important indicator of the steel end-use properties. It depends on the chemical composition and steel heat treatment. According to different requirements, the steel standards are different like provisions of tensile strength, yield strength or point elongation, hardness, toughness, user requirements, high or low temperature performances.