Thick-walled welded steel pipe, its main production principle is: large diameter thick-walled welded pipe is above the recrystallization temperature rolling, cold rolling is the recrystallization temperature at rolling. It is called a thick-walled pipe, which is the ratio of pipe diameter and wall thickness of less than 20 become thick-walled steel pipe. The main use as petroleum geology drilling pipe, petroleum chemical industry cracking tubes, boiler tubes, bearing tubes, and automobiles, tractors, high-precision aerospace structural tube and so on.

The biggest difference between thick-walled pipe and thin-walled pipe the name suggests is the "thickness" of thickness. In general, thin-walled pipe is cold drawn technology, and thick-walled pipe used is the hot rolling. If the unit of measure used to differentiate, generally considered the thick / diameter equal to 0.05 was a watershed thick-walled steel and thin-walled tubes. Thickness / diameter less than 0.05 of thin-walled steel pipe. Greater than the thick-walled steel pipe. In terms of the use of thin-walled pipe used for the pipeline, while the thick-walled pipe is used for hollow parts blank. Pressure and the important pipeline use.

Thick-walled welded pipe is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. Used for the transport of liquids: water supply, drainage. As a gas transportation: gas, steam, liquefied petroleum gas. Used structures: piling pipe, make a bridge can be used for: dock, roads, building structures tube and so on.