Hot-dip galvanized pipe, also known as galvanized pipe, is a steel pipe coated with a layer of zinc through the hot-dip galvanizing process. 

The zinc layer ensures the pipes are highly corrosion-resistant, making them ideal for use in outdoor environments and harsh conditions.

Hot-dip galvanized pipe sizes vary depending on the application, with standard sizes ranging from 1/2 inch to 6 inches in diameter and 1.0mm to 12.0mm wall thickness. 

These pipes are commonly used in the construction of water and gas supply systems as well as in industrial and agricultural applications.

In addition, hot-dip galvanized pipes are used in the construction of fence and handrail systems, as well as electrical piping systems. 

Due to its durability, strength and corrosion resistance, hot-dip galvanized pipe is a popular choice for a wide range of applications in various industries.