Do you know the difference between cold galvanized steel pipe and hot galvanized steel pipe?

By Published On: May 13th, 2023Categories: Pipe Knowledge0 Comments
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The production process, the range of use, the performance is different, the process is different: cold galvanized pipe is anticorrosive by electrochemical principle. Hot-dip galvanized pipe is a pipe made of steel plate or steel strip after pressing and welding.

The range of use is different: cold galvanized, the workpiece is smooth and flat, but the coating is thin, generally 5 to 30 microns. Hot dip galvanizing layer thick, generally 30 to 60 microns, high anticorrosion ability.

Different performance: cold galvanized surface smooth, bright, color passivation treatment yellow green. Hot dip galvanized surface rough, dark color, silver white.

What is the difference between cold galvanized pipe and hot galvanized pipe

1. Different processes

Hot-dip galvanized pipe is a pipe made of steel plate or steel strip by pressing and welding, and on the basis of the pipe, put into the hot-dip galvanized tank, through a series of chemical reactions forming. Cold galvanized pipe mainly uses electrochemical principle for anticorrosion, a new layer of steel pipe is directly plated on the outer wall of the steel pipe.

2. Different scope of use

Hot dip galvanized coating thicker, 30 to 60 microns, coating anticorrosion ability. It is suitable for long-term rust prevention of steel parts in outdoor work, such as highway guardrail, power tower, large fasteners and other relatively rough workpiece. Cold galvanized, the workpiece surface is smooth and flat, but the coating is thin, 5 to 30 microns, and the anticorrosion time is short. All used for chassis, panel and small fasteners and other internal parts rust prevention.

3. Different performance

Hot dip galvanizing uses the principle of zinc to resist atmospheric corrosion and electrochemical protection of steel and other materials. The zinc carbonate protective film on the surface can directly slow down the corrosion rate of zinc. Even when damaged, a zinc film is formed, but the thickness is uneven and the coating surface usually has zinc flowers that can be directly identified by the naked eye. Cold galvanizing is the chemical method of separating zinc alloy into zinc ions, which have been attached to the surface of the steel. This method directly forms a thin zinc layer, uniform smooth coating, and no frosting phenomenon. Generally speaking, steel is prone to corrosion.

The outer surface of cold galvanized steel pipe is smooth and bright. Color passivation process electroplating appears yellow green, white passivation process electroplating appears blue white. Usually cold galvanized steel pipe has a small amount of zinc coating at both ends and no zinc coating inside. The outer surface of hot dip galvanized is rough, dark in color, usually silver. Due to the production process, the surface will have some water marks and drops, and the surface will not glow or reflect light.

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