ASTM 1045 Seamle Steel pipe is a high-quality carbon structural steel tube with a carbon content of 0.42-0.50%, a tensile strength of 610MPa, and a yield point of 360MPa; it is used for general shaft parts.

As the name suggests, seamless steel pipes have no seams (creases) or welded joints. Welded steel pipes are made of flat steel plates with welds on the pipe body. Welded steel pipes are always available in large quantities due to their lower production costs and availability of raw materials.