Steel pipe according to the production method can be divided into two categories: seamless steel pipe and welded steel pipe, welded steel pipe referred to as welded pipe.

1, seamless steel pipe according to the production method can be divided into: hot rolled seamless pipe, cold drawn pipe, precision steel pipe, hot expansion pipe, cold spinning pipe and extrusion pipe.

Seamless steel pipe is made of high-quality carbon steel or alloy steel, hot rolled, cold rolled (drawn) points.

2, welded steel pipe because of its different welding process is divided into furnace welded pipe, electric welding (resistance welding) pipe and automatic arc welding pipe, because of its different welding forms are divided into straight seam welded pipe and spiral welded pipe two kinds, because of its end shape is divided into circular welded pipe and shaped (square, flat, etc.) welded pipe.

Welded steel pipe is rolled into a tubular steel plate to seam or spiral seam welding, in the manufacturing method, and is divided into low pressure fluid transportation of welded steel pipe, spiral welded steel pipe, direct coil welded steel pipe, electric welded pipe and so on. Seamless steel pipes can be used in various industries such as liquid pressure pipes and gas pipes. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, electrical pipelines and so on.