ERW steel pipe is made with low frequency or high frequency resistance “resistance”. They are round pipes welded from steel sheets with longitudinal seams. It is used to transport liquid-vapor objects such as oil and natural gas, and can meet various requirements of high and low pressure. It currently occupies a key position in the field of transport pipelines in the world.
When welding ERW pipes, heat is generated when an electric current flows through the contact surfaces of the welded area. It heats both edges of the steel to the point where one edge can form a joint. In this case, under the combined pressure, the edges of the pipe blank are melted and compressed.
Typically ERW pipes have a maximum outside diameter of 24 inches (609 mm), larger sizes are made at SAW.
There are many pipes that can be made using the ERW method. Below we list the most common standards in plumbing.
ERW ASTM A53 Grade A and B (and galvanized) ASTM A252 carbon steel pipe ASTM A500 pile pipe ASTM A134 and ASTM A135 structural pipe EN 10219 S275, S355 pipe Pipe
ERW Stainless Steel Pipe / ASTM A269 Pipe Standards & Specifications ASTM A270 Stainless Steel Pipe ASTM A312 Sanitary Pipe ASTM A790 Stainless Steel Pipe Ferritic/Austenitic/Duplex Stainless Steel Pipe
Line pipe API ERW API 5L B to X70 PSL1 (PSL2 must be in HFW process) API 5CT J55/K55, N80 casing and tubing
Application and use of ERW steel pipe: ERW steel pipe is used for transporting gas and liquid objects such as oil and gas, and can meet low and high pressure requirements. In recent years, with the development of ERW technology, more and more ERW steel pipes are used in oil and gas fields, automotive industry and other fields.