Ordinary steel pipes, such as water pipes, are generally welded by bending a flat plate, and you can find a weld on it; the thicker diameter is usually a spiral weld. The seamless steel pipe is generally formed by processing the molten steel through the annular slit and then forming by stretching and other treatment processes, so that there is no weld. In terms of performance, especially the pressure-bearing capacity, it is greatly improved compared to ordinary steel pipes, so it is often used in high-pressure equipment. Such as pipeline connection of hydraulic equipment, etc. The welding seam of ordinary steel pipe is its weak link, and the quality of the welding seam is also the main factor affecting its overall performance. People who have lived in the north generally have experience of water pipes or heating pipes being frozen and exploded in winter, and the places where they exploded are usually welds.
Tips: ASTM A53 covers seamless and welded steel pipe with nominal wall thickness. The surface condition is usually black and hot-dipped galvanized. ASTM A53 is produced mainly for pressure and mechanical applications, and is also used for transport of steam, water, gas line pipes.
ASTM A53 Grade B is the material under the American steel pipe standard, API 5L Gr.B is also the American standard material, A53 GR.B ERW refers to the electric resistance welded steel pipe of A53 GR.B; API 5L GR.B Welded refers to the material Welded steel pipe of API 5L GR.B.