What is the classification of ASTM standard seamless pipes

Steel pipes can be divided into two categories according to the production method: seamless steel pipes and welded steel pipes. Welded steel pipes are referred to as welded pipes.
1. Seamless steel pipes can be divided into hot-rolled seamless pipes, cold-drawn pipes, precision steel pipes, heat-expanded pipes, American standard seamless pipes, cold-spun pipes and extruded pipes according to the production method.
Seamless steel pipes are made of carbon steel or alloy steel and are divided into hot-rolled and cold-rolled (drawn).

2. Welded steel pipes are divided into furnace welded pipes, electric welded (resistance welded) pipes and automatic arc welded pipes according to different welding processes, and are divided into straight seam welded pipes and spiral welded pipes according to different welding forms, round welded pipes and special-shaped (square, flat, etc.) welded pipes because of their end shapes.

 Welded steel pipes are made by welding butt welds or spiral welds of rolled steel plates. Based on the manufacturing method, they are divided into welded steel pipes for low-pressure fluid transportation, spiral seam welded steel pipes, direct rolled welded steel pipes, electric welded pipes, etc. Seamless steel pipes can be used in various industries, such as liquid pneumatic pipelines, gas pipelines, etc. Welded pipes can be used for water pipelines, gas pipelines, heating pipelines, electrical pipelines, etc.