Differences Between ERW and LSAW Steel Pipe

Straight seam welded steel pipes can be divided into LSAW (straight seam submerged arc welded) steel pipes and ERW (longitudinal high frequency resistance welded) steel pipes according to the welding process. Union Steel - China professional manufacturer of welded steel pipe will introduce the differences between ERW and LSAW steel pipe from the following four aspects. Read on to learn more.

1. Raw materials and production capacity

The raw material of ERW steel pipe is hot-rolled steel coil, and the raw material of LSAW steel pipe is hot-rolled steel plate. Therefore, ERW steel pipes can achieve continuous assembly line operations, with high production efficiency and low production costs; while submerged arc welded steel pipes are processed from steel plates and cannot achieve continuous assembly line operations, with low production efficiency and high production costs. ERW steel pipe is limited by the thickness of the steel coil. Generally, the maximum thickness that can be produced is 25mm, and the maximum diameter that can be produced is 660mm; while the maximum thickness that can be produced by longitudinal submerged arc welded steel pipes is 40mm, and the maximum diameter that can be produced is only limited by the width of the steel plate. The maximum production diameter is 1422mm.

2. Welding

ERW steel pipe welding does not require adding welding wire; longitudinal submerged arc welding steel pipe requires welding wire.

3. Appearance

Both the inner and outer welds of ERW steel pipes need to be removed, so it is conducive to anti-corrosion; the extra height of the inner and outer wall welds of straight seam submerged arc welded steel pipes is not conducive to corrosion.

4. Procurement cost and difficulty

The purchase cost of ERW steel pipes is low, while the cost of LSAW steel pipes is very high, with the general price difference being 15%-25%.