The connection method between the seamless pipe for transporting gas, pipe joints, valves and inlet and outlet pipes on equipment. It is determined by factors such as the nature, pressure and temperature of the gas, the material, size and installation place of the pipe. There are four main methods: threaded connection, flange connection, socket connection and welding.

​​​​​​​Alloy pipe is a kind of seamless steel pipe, and its performance is much higher than that of ordinary seamless steel pipe. Because this kind of steel pipe contains more Cr, its high temperature resistance, low temperature resistance and corrosion resistance are not comparable to ordinary seamless steel pipes. Therefore, alloy tubes are widely used in petroleum, aerospace, chemical, electric power, boiler, military and other industries.

Sheet piles are steel profiles with interlocking edges. They are driven into the ground to provide excavation support. These sheet piles are used to support walls, clear land, create underground structures, and river bank or coastal protection.

The bending degree of steel pipes (seamless pipes and welded steel pipes) refers to the maximum degree of bending that the steel pipes can withstand during the bending process. This parameter is very important for the use of steel pipes, because it directly affects the service life and safety performance of steel pipes.

In order to improve the corrosion resistance of steel pipes, general seamless pipes or welded steel pipes are galvanized. Galvanized pipes are divided into two types: hot-dip galvanizing and electric galvanizing. The hot-dip galvanizing layer is thick, the cost of electric galvanizing is low, and the surface is not very smooth.

Plastic-coated steel pipes, also known as film-coated pipes, steel-plastic composite pipes and film-coated composite steel pipes, are steel-plastic composite steel pipes based on steel pipes. Through spraying, rolling, soaking, suction and other processes, the plastic anti-corrosion layer is welded on the inner surface of the steel pipe (bottom pipe) or the inner and outer surfaces are welded with a plastic anti-corrosion layer.