Steel pipe According to the production method can be divided into two categories: seamless steel tubes and steel pipe joints.
1. Seamless Steel tubes According to the production methods can be divided into: hot-rolled seamless pipe, cold-drawn pipe, precision steel pipe, heat expansion tubes, cold spinning tubes and extrusion tubes.
Seamless steel tubes are made of high-quality carbon steel or alloy steel, hot-rolled, cold-rolled (unplug).
2. Welded steel pipe Because of its different welding technology is divided into furnace welded pipe, welding (resistance welding) pipe and automatic arc welded pipe, because of its welding form is divided into two types of longitudinal welded pipe and spiral welded pipe, because of its end shape is divided into circular welded pipe and profiled (square, flat, etc
Welded steel pipe is made of coil-shaped steel plate to sew or spiral welded into, in the manufacturing method, also divided into low-pressure fluid conveying welded steel pipe, spiral welded steel pipe, direct coil welding pipe, welding tubes and so on. Seamless steel tubes can be used in various industries of liquid pressure piping and gas pipelines. Welded pipes can be used for conveying water pipes, gas pipelines, heating pipes, electrical pipes and so on.