What are the classifications of galvanized steel pipes?​

Galvanized steel pipes are divided into two categories: cold-dip galvanized pipes and hot-dip galvanized pipes. The use of cold-dip galvanized pipes has been banned by the country, and now only hot-dip galvanized pipes can be used for the time being.

Cold Galvanized Steel Pipe
Cold-dip galvanized steel pipe, also known as electro-galvanized steel pipe, refers to a steel pipe product that is galvanized using the cold-dip galvanizing process. Compared with hot-dip galvanized steel pipe, it is not very widely used. The amount of galvanizing of cold-dip galvanized steel pipes is very small, only 10-50g/m2, and its corrosion resistance is much worse than that of hot-dip galvanized pipes.
Hot dip galvanized steel
Hot-dip galvanized steel pipe is a classification of galvanized steel pipe. Depending on the galvanizing process, there are also cold-dip galvanized steel pipes (electro-galvanized steel pipes). Hot-dip galvanizing pipe reacts molten metal with an iron matrix to produce an alloy layer, thereby combining the matrix and the plating layer.
Seamless galvanized steel pipe
Seamless galvanized steel pipe, that is, after the Seamless steel pipe is formed, in order to improve its anti-corrosion performance, a layer of zinc is plated on the surface. Seamless galvanized steel pipe can be galvanized by two methods: hot-dip galvanizing and electro-galvanizing. Seamless Steel Pipe is a round, square, or rectangular steel material with a hollow cross-section and no seams around it. Seamless steel pipe production process: hot rolling, hot expansion, cold drawing. Therefore, seamless steel pipes are divided into two categories: hot-rolled and cold-rolled (dial) seamless steel pipes.