ERW steel pipes are manufactured by low-frequency or high-frequency resistance "resistance". They are round pipes welded from steel plates with longitudinal welds.
There are a lot of pipes could be manufactured by ERW process. Here below we list for the most common standards in pipelines.
Application of ERW steel pipe
for erw pipe
ASTM A53 B, ASTM A178, ASTM A252 GR.2
API 5L X42/46/52/56/60/70
ASTM A500, ASTM A513
EN 10204/10217 S235JR,S275JR,S355,S355JR,S355J2H
for efw pipe
carbon steel efw pipe: ASTM A671,ASTM A672
alloy steel efw pipe: ASTM A691
1/2" -24" (21.3mm-610mm)
For ERW Line Pipe
For ERW Casing
For ERW Structure Tube
For High pressure and high temperature
Manufacturing Process of ERW steel pipe
Electric Resistance Welded (ERW) pipe is manufactured by cold forming a flat steel strip into a rounded tube and passing it through a series of forming rollers to obtain a longitudinal seam. The two edges are then simultaneously heated with a high frequency current and squeezed together to form a bond. The longitudinal ERW seam does not require filler metal.
Product Details of ERW steel pipe
Pipe End: square ends (straight cut, saw cut, and torch cut). or beveled for welding, beveled,
Surface: Lightly oiled, Hot dip galvanized, Electro galvanized, Black, Bare, Varnish coating/Anti rust oil, Protective Coatings (Coal Tar Epoxy, Fusion Bond Epoxy, 3-layers PE)
Packing: Plastic plugs in both ends, Hexagonal bundles of max. 2,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper, PVC sleeve, and sackcloth with several steel strips, Plastic caps.
Test: Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Hardness Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, NDT TEST ( ET TEST, RT TEST, UT TEST)
Transportation of ERW steel pipe
When transporting, loading and unloading erw welded pipes, special hoisting and transportation tools should be used to avoid scratching the surface.
Advantages of ERW steel pipe
High efficiency, low cost, material saving, easy automation.