Galvanized welded steel pipe for low-pressure fluid transportation is also known as galvanized welded steel pipe, commonly known as white pipe.

It is a hot-dip galvanized welded (furnace or electric welded) steel pipe used for transporting water, gas, air, oil and heating steam, warm water and other generally low pressure fluids or other purposes. The wall thickness of steel pipe joints is divided into ordinary galvanized steel pipes and thickened galvanized steel pipes by manufacturer.

The pipe end form is divided into unthreaded galvanized steel pipe and threaded galvanized steel pipe. The specifications of steel pipes are expressed in terms of nominal diameter (mm), which is an approximation of the inner diameter.