The steel tube has a hollow section and its length is much larger than the diameter or circumference of steel. According to the cross-sectional shape, it is divided into circular, square, rectangular and special-shaped steel tubes; according to the material, it is divided into carbon structural steel steel tubes, low alloy structural steel steel tubes, alloy steel steel tubes and composite steel tubes; , engineering structure, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, steel tube for high-pressure equipment, etc.according to the production process, it is divided into seamless steel tube and welded steel tube, of which seamless steel tube and There are two types of hot rolling and cold rolling (drawing). Welded steel tube is divided into straight seam welded steel tube and spiral seam welded steel tube.
By production method
Steel tube can be divided into two categories according to the production method: seamless steel tube and welded steel tube. Welded steel tube is referred to as welded tube for short.
1. According to the production method, seamless steel tube can be divided into: hot rolled seamless tube, cold drawn tube, precision steel tube, hot expanded tube, cold spinning tube and extruded tube, etc.
Seamless steel tubes are made of high-quality carbon steel or alloy steel, and are divided into hot-rolled and cold-rolled (drawn).
2. Welding steel tubes are divided into furnace welded tubes, electric welding (resistance welding) tubes and automatic arc welded tubes due to their different welding processes. Divided into round welded pipe and special-shaped (square, flat, etc.) welded pipe.
Welded steel tube is made of rolled steel plate with butt or spiral seam. In terms of manufacturing method, it is divided into welded steel tube for low-pressure fluid transportation, spiral seam welded steel tube, direct coil welded steel tube, and electric welding steel tube. Welded pipes, etc. Seamless steel tube can be used for liquid pressure pipelines and gas pipelines in various industries. Welded pipes can be used for water pipes, gas pipes, heating pipes, electrical pipes, etc.
Sort by material
Steel tube can be divided into: carbon tube and alloy tube, stainless steel tube, etc.
Carbon tube can be divided into ordinary carbon steel tube and high-quality carbon structural tube.
Alloy tubes can be further divided into: low alloy tubes, alloy structural tubes, high alloy tubes, and high strength tubes. Bearing tubes, heat- and acid-resistant stainless tubes, precision alloy (such as Kovar) tubes, and superalloy tubes, etc.
Connection method classification
According to the connection method of the pipe end, steel tube can be divided into: bare tube (pipe end without thread) and wire tube (pipe end with thread).
The wire tube is further divided into: ordinary wire tube and tube end thickened wire tube.
Thickened wire tube can also be divided into: external thickening (with external thread), internal thickening (with internal thread) and internal and external thickening (with internal and external thread) and other threading tubes.
According to the thread type, the threading pipe can also be divided into: ordinary cylindrical or conical thread and special threading and other threading pipes. In addition, according to the needs of users, the wire tube is generally equipped with pipe joints for delivery.
