Straight seam submerged arc welded pipe (LSAW) and spiral submerged arc welded pipe (SSAW steel pipe) are both submerged arc welded (SAW), but straight seam submerged arc welded pipe (LSAW) uses a single steel plate as raw material. Its advantages are: the thickness of the steel plate can reach more than 50mm, and there is no crescent bend; because it is a straight seam, it is convenient to form and easy to track the weld, so it is suitable for two-step production, namely pre-finishing welding; and there is a mechanical expansion process for the entire pipe body, which can basically eliminate residual stress. The above advantages enable straight seam submerged arc welded pipes to be made into large diameter (up to 422mm), thick wall pipes (≥50mm), and high steel grades (X80/X100/X120) steel pipes, which are used in Class II, III, and IV areas, marine engineering, and large structural pipes. Generally speaking, the most demanded piling pipes are marine engineering and large bridge engineering, so LSAW steel pipes meet the requirements of piling pipes. Next, the editor will describe some basic characteristics of LSAW steel pipes and their advantages as piling pipes.