What is the difference between seamless square steel pipe and welded square steel pipe

First, what does seamless square steel pipe mean?

Seamless square steel pipe is a square pipe, which belongs to a square steel pipe with four corners. It is a material formed by cold drawing and extrusion of seamless steel pipe. It is widely used in mechanical structure and fluid transportation. Seamless steel pipe has a hollow cross-section and no seams around it. It is a square steel pipe formed by extruding seamless pipe through the four sides of the mold, so it is called seamless steel pipe.

Second, how is seamless square steel pipe made?

Seamless square steel pipe is made of steel ingot or solid tube billet through the perforation into the rough tube, and then hot rolled, cold rolled, or cold drawn. The production process of seamless square steel pipe includes: round steel → tube billet → inspection → heating → perforation → sizing → hot rolling → flat head → inspection → pickling → ball annealing → cold drawing → forming → even mouth → inspection.

Third, what is the difference between seamless square steel pipe and welded square steel pipe?

1. Different processes: seamless square steel pipe is formed by cold drawing of seamless round tube, and welded square steel pipe is formed by welding of strip steel. The processing technology of the two square steel pipes is different.

2. Different prices: For products of the same brand and specification, the price of seamless square steel pipes is usually more expensive than that of welded steel pipes.

3. Different performance: Welded square steel pipes are made by bending and welding the plates. There is a high temperature during the welding process, which will affect the metal structure and the mechanical properties are not as stable as those of seamless square steel pipes.

4. Different uses: The uses of welded square steel pipes include construction, machinery manufacturing, steel construction projects, shipbuilding, solar power generation brackets, steel structure engineering, power engineering, power plants, agricultural and chemical machinery, glass curtain walls, automobile chassis, airports, boiler construction, highway railings, house construction, etc.

The uses of seamless square steel pipes are mainly used in liquid transportation, hydraulic brackets, mechanical structures, medium and low-pressure and high-pressure boiler tubes, heat exchange tubes, gas, petroleum, and other industries.