Classification of steel pipes according to production methods

According to the production method, steel pipes can be divided into seamless steel pipes and welded steel pipes. Welded steel pipes are referred to as welded pipes for short.

1. Seamless steel tubes can be divided into hot rolled seamless tubes, cold drawn tubes, precision steel tubes, hot expanded tubes, cold spun tubes and extruded tubes according to production methods.

Seamless steel pipes are made of high-quality carbon steel or alloy steel, which can be hot rolled or cold rolled.

2. Welded steel pipes are divided into furnace welded pipes, electric welding (resistance welding) pipes and automatic arc welded pipes due to their different welding processes. They are divided into straight seam welded pipes and spiral welded pipes due to their different welding forms. Their end shapes are also divided into circular welded pipes and special-shaped (square, flat, etc.) welded pipes.

Welded steel pipes are welded from rolled steel plates with butt or spiral seams. In terms of manufacturing methods, they are also divided into welded steel pipes for low pressure fluid transportation, spiral electric welded steel pipes, directly rolled welded steel pipes, electric welded pipes, etc. Seamless steel pipes can be used in various industries, such as liquid and gas pipelines. Welding pipe can be used for water pipe, gas pipe, heating pipe, electrical pipe, etc.