In terms of manufacturing methods, it is also divided into welded steel pipe for low-pressure fluid transportation, electric welded pipe, spiral seam electric welded steel pipe, etc. Seamless steel pipe can be used for various liquid and gas pipelines. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, etc.
Steel pipes can be divided into two categories according to production methods: seamless steel pipes and welded steel pipes.
1. Seamless steel pipe can be divided into hot-rolled seamless pipe, cold drawn pipe, fine steel pipe, hot expansion pipe, cold spinning pipe and kneading pipe according to the production method. Seamless steel pipe is made of high-quality carbon steel or alloy steel, which can be divided into hot rolling and cold rolling (drawing).
2. Welded steel pipe is divided into furnace welded pipe, electric welding (resistance welding) pipe and active arc welded pipe due to different welding processes. Due to different welding methods, it is divided into straight seam welded pipe and spiral welded pipe. Because of its end shape, it is divided into circular welded pipe and special-shaped (square, flat, etc.) welded pipe. Welded steel pipe is made of rolled steel plate in tubular shape by butt welding or spiral welding,
According to the classification of raw materials, steel pipes can be divided into carbon pipes, alloy pipes, stainless steel pipes, etc. Carbon pipe can be divided into general carbon steel pipe and high-quality carbon structural pipe. Alloy pipe can be divided into: low alloy pipe, alloy structure pipe, high alloy pipe and high strength pipe. Bearing pipe, heat and acid resistant stainless pipe, fine alloy (such as kovar alloy) pipe and superalloy pipe, etc.
According to the connection method, the steel pipe can be divided into wire turning pipe and smooth pipe according to the connection method of pipe end. The threading pipe is divided into general threading pipe and thickened threading pipe at the pipe end. The thickened threading pipe can also be divided into: externally thickened (with external thread), internally thickened (with internal thread) and externally thickened (with internal thread). According to the thread type, the threading pipe can also be divided into: general cylindrical or conical thread and special thread.
