Steel pipes can be divided into two categories according to the production methods: seamless steel pipes and seamed steel pipes, and seamed steel pipes are referred to as straight seam steel pipes.
1. Seamless steel pipes can be classified according to their production methods: hot-rolled seamless pipes, cold-drawn pipes, precision steel pipes, thermal expansion pipes, cold spinning pipes and extruded pipes.
Seamless steel tubes are made of high-quality carbon steel or alloy steel, with hot rolling, cold rolling (pulling).
2. Welded steel pipes are divided into furnaces, electric welding (resistance welding) pipes and automatic arc welding pipes because of their different welding processes. Because of their different welding modes, they are divided into two types: straight seam welded pipe and spiral welded pipe. For the round pipe and shaped (square, flat, etc.) welded pipe.
Welded steel tubes are made by rolling into a tube-shaped steel plate and welded to a seam or spiral seam. In terms of manufacturing methods, they are divided into welded steel pipes for low-pressure fluid transportation, spiral welded steel pipes, direct welded steel tubes, and welded pipes. Seamless steel tubes can be used in various industries such as liquid pressure pipes and gas pipes. Welded pipes can be used for water pipes, gas pipes, heating pipes, electrical pipes, etc.
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