What is the difference between hot dipped galvanized pipe vs pre galvanized pipe?

The process where steel is coated with protective corrosion resistant zinc is known as galvanization. The coating formed by the zinc protects the steel from corrosion. Please note that the galvanizing does not change the mechanical properties of steel.

Hot dipped galvanized Steel Pipe:

The hot dipped galvanized process is where an already formed part, for example round pipe, square or rectangular tube is dipped in a zinc bath. A reaction takes place between the steel and the zinc during the time the steel part is in the zinc bath. The thickness of the zinc coating is influenced by a number of factors, including the surface of the steel, the time the steel is dipped in the bath, the composition of the steel as well as the steel's size and thickness.

One advantage of hot dip galvanizing is that the entire part is covered including the edges, welds, etc. giving it an all-round corrosion protection. The end product can be used outdoors in all different weather conditions. It is the most popular galvanizing method and is widely used in the construction industry.

Pre-galvanized steel pipes:
Pre-galvanized steel refers to steel which was galvanized while in sheet format, thus prior to further manufacturing. Pre-galvanization is also known as mill galvanized, due to the fact that the steel sheet is rolled through molten zinc. After the sheet is sent through the mill to be galvanized it is cut to size and recoiled. A specific thickness is applied to the entire sheet, for example pre-galvanized Z275 steel has a 275g per square meter zinc coating. One of the advantages which pre-galvanized steel has over hot dip galvanized steel is that it has a better appearance.

pre-galvanized materials are used for a wide variety of products including conduit, lip and open channels.

Alloy Steel Pipe is primarily used for power plant, nuclear power, high pressure boiler, high temperature superheater and reheater of high-temperature high-pressure pipeline and equipment, it is made of high quality carbon steel, alloy structural steel and heat resistant stainless steel material, by hot rolled or cold rolled.

Alloy pipe is hollow section, a large number of pipeline used for conveying fluid, such as oil, natural gas, coal gas, water and some solid materials, such as pipelines.Compared to the alloy steel pipe and round steel solid steel bending torsional strength phase at the same time, the weight is lighter, the alloy steel pipe is a kind of economic cross section steel, widely used in the manufacture of structural and mechanical parts, such as petroleum drill pipe, auto transmission shaft, bicycle frame and construction of steel scaffolding is used.Alloy steel pipe manufacturing annular parts, can improve material utilization, simplifying the manufacturing process, material saving and processing time, such as rolling bearing ring, jack sets, etc., the current has been widely made from steel pipe.Alloy steel pipe is indispensable to all kinds of conventional weapons material, gun, gun barrel to steel pipe manufacturing.Alloy steel pipe according to the cross-sectional area in the shape of different can be divided into circular tube and special pipe.Due to the equal conditions, the circumference circle area is the largest, with circular tube can deliver more fluid.In addition, the circle cross section under radial pressure, the internal or external stress is relatively uniform, therefore, the vast majority of steel tube is round tube.

Alloy Steel Pipe

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