A Pipe may or might not meet both API 5L Gr.B as well as A53 Gr.B as well as sometimes they can be interchangeable.similar with API 5L Grade B, ASTM A53 can be smooth or ERW Welded, covered in ASTM A53 Type E or type S. WLD steel supply several qualities of light carbon steel pipeline consisting of API 5L grade B, ASTM A53 and so on. As a leading pipeline supplier, we are not just able to provide the pipe straight from stock or mill sources, however we can also reduce pipe to your needed size and add special finishes as required. Click here: www.wldsteel.com for latest information.