Welded steel pipes and seamless steel pipes are made of different materials
1. Welded steel pipe: Welded steel pipe refers to a steel pipe with seams on the surface, which is made by bending and deforming steel strips or steel plates into circular, square and other shapes and then welding them. The blank used for welded steel pipes is steel plates or strips.
2. Seamless steel pipe: A steel pipe made of a single piece of metal with no seams on the surface is called a seamless steel pipe.
Welded steel pipes and seamless steel pipes have different uses
1. Welded steel pipes: can be used as water and gas pipes, etc. Large-diameter straight seam welded pipes are used for high-pressure oil and gas transportation, etc.; spiral welded pipes are used for oil and gas transportation, pipe piles, bridge piers, etc.
2. Seamless steel pipe: used as petroleum geological drilling pipes, cracking pipes for petrochemical industry, boiler pipes, bearing pipes and high-precision structural steel pipes for automobiles, tractors and aviation.
Welded steel pipes and seamless steel pipes are classified differently
1. Welded steel pipe: According to different welding methods, it can be divided into arc welded pipe, high frequency or low frequency resistance welded pipe, gas welded pipe, furnace welded pipe, Bondi pipe, etc. According to the purpose, they are divided into general welded pipes, galvanized welded pipes, oxygen blown welded pipes, wire casings, metric welded pipes, roller pipes, deep well pump pipes, automotive pipes, transformer pipes, electric welded thin-walled pipes, electric welded special-shaped pipes and spiral welded pipes.
2. Seamless steel pipe: Seamless pipes are divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, jacked pipes, etc. According to the cross-sectional shape, seamless steel pipes are divided into two types: round and special-shaped. Special-shaped pipes have various complex shapes such as square, oval, triangle, hexagon, melon-shaped, star-shaped, and finned pipes. The maximum diameter is 650mm and the minimum diameter is 0.3mm. According to different uses, there are thick-walled tubes and thin-walled tubes.
