What are the three types of welded steel pipe?

Welded Steel Pipe Manufacturing Process

Formed by rolling steel coils or plates into a cylindrical shape and welding the seam ( using methods like ERW, SAW )

ERW Steel Pipe Manufacturing Process

Electric Resistance Welding (ERW) – Uses electric current to heat and fuse edges.

SSAW and LSAW Steel Pipe Manufacturing Process

Submerged Arc Welding (SAW) – Uses an arc under a flux layer for high-strength welds.

Types of Welded Steel Pipes

ERW and LSAW Welded Steel Pipes

Longitudinal Welded Pipe – Single straight seam along the length.

SSAW Welded Steel Pipes

Spiral Welded Pipe (Helical Welded) – Spiral seam for better pressure distribution.

Welded Pipes Steel Grade Materials

Astm A53, A795, A500 and API 5L standards

Grade A, B, C and so on.

EN 10219, 10255, 39, 1139 and BS1387

S195, S235JR, S355J0H, S355J2H

JIS G3444, G3466

STK400 and SS400 and so on.

Weld Steel Pipe Dimensions

Square Rectangular Welded Steel Pipe Sizes

OD: 20X20 to 500X500mm

Thickness: 1.0mm to 20mm

Round ERW Welded Steel Pipes Sizes

OD: 12mm to 610mm

Thickness: 1.0mm to 18mm

SSAW Spiral Welded Steel Pipes Sizes

OD: 219mm to 3000mm

Thickness: usually sch40, sch80

LSAW Longitudinal SAW Welded Steel Pipe Sizes

OD: 406mm to 1422mm

Thickness: 6mm to 50mm

Seamless Pipe vs Welded Pipe

Products	Welded Pipe	Seamless Pipe
Strength	Slightly weaker at weld	Uniform strength
Cost	Cheaper	More expensive
Outside Diameter Range	Wider (large diameters), round shape for example 12mm to 3000mm	Limited to smaller sizes, round shape for example 21.3mm to 610mm

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