classify
According to the production method of the invention
Steel pipes can be divided into seamless steel pipes and welded steel pipes according to production methods, which are called welded pipes for short.
1. Seamless steel pipes can be divided into hot-rolled seamless pipes, cold-drawn pipes, precision steel pipes, hot-expanded pipes, cold-spun pipes and extruded pipes according to production methods.
Seamless steel pipe is made of high-quality carbon steel or alloy steel, which is divided into hot rolling and cold rolling (drawing).
2. Welded steel pipes are divided into furnace welded pipes, electric welding (resistance welding) pipes and automatic arc welded pipes, straight welded pipes and spiral welded pipes, as well as round welded pipes and special-shaped (square and flat) pipes due to their different welding forms. ) welded pipes because of their end shapes.
Welded steel pipes are made of steel plates by butt welding or spiral welding. According to the manufacturing method, it is divided into welded steel pipes for low-pressure fluid transportation, spiral welded steel pipes, direct rolled welded steel pipes and welded steel pipes. Seamless steel pipes can be used in various industries, such as liquid pneumatic pipelines and gas pipelines. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, electrical pipelines, etc.
By material
Steel pipes can be divided into carbon pipes, alloy pipes and stainless steel pipes according to the pipe material (i.e. steel grade).
Carbon pipes can be divided into ordinary carbon steel pipes and high-quality carbon structural pipes.
Alloy tubes can be divided into low alloy tubes, alloy structural tubes, high alloy tubes and high strength tubes. Bearing tube, heat-resistant and acid-resistant stainless steel tube, precision alloy tube (such as kovar alloy), high temperature alloy tube.
Classification by connection mode
Steel pipes can be divided into: smooth pipe (with no thread at the end) and turning pipe (with thread at the end) according to the connection mode of pipe ends.
Turning wire tube is divided into: ordinary turning wire tube and end thickening turning wire tube.
Thickened steering tubes can be divided into external thickening (with external threads), internal thickening (with internal threads) and internal and external thickening (with internal and external threads).
According to thread types, lathe tubes can also be divided into: ordinary cylindrical or conical threads and special threads.
In addition, according to the needs of users, automobile wire tubes are generally delivered with pipe joints.
Refer to the above content: Baidu Encyclopedia-Steel Pipe