Electric resistance welded (ERW) pipe is made from steel coil and the weld seam runs parallel to the pipe.
The width of the coil is the same as the circumference of the pipe so diameters are limited to 24 inches.
However, because the manufacturing process is fast, it is ideal for large production runs of small (<= 24 in.)
diameter sections.

Sizes
Out Diameter:1/2″-24″
Wall Thickness: 1.65-20mm
Length: 3-12m
Types
ERW Line Pipe
ERW Casing
ERW Structure Tube
ERW Casing
ERW Structure Tube
Standard
ASTM 5L, ASTM A53, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672, EN 10217
Steel Grade:
API 5L: PSL1/PSL2 Gr.A, Gr.B, X42, X46, X52, X56, X60, X65, X70
ASTM A53: GR.A, GR.B
EN: S275, S275JR, S355JRH, S355J2H
Steel Grade:
API 5L: PSL1/PSL2 Gr.A, Gr.B, X42, X46, X52, X56, X60, X65, X70
ASTM A53: GR.A, GR.B
EN: S275, S275JR, S355JRH, S355J2H