Profile: Permanent Steel Manufacturing Co.,Ltd is a supplier of carbon steel pipe, stainless steel tube, hollow section, casing pipe, and numerous types of piping equipment including bend, cap, coupling, elbow, reducer, stub end, tee, olet, joint, & gaskets. Billets and coils are delivered to the pipe mill ready to be made into carbon steel pipe. Depending on the capabilities of the pipe mill and the end use of the final product, the casts will be formed into pipe by means of four distinct different manufacturing. Seamless carbon steel pipe has, as its name implies, no longitudinal weld seam. It is, in essence, one solid homogeneous piece of steel. A solid billet is simply heated and then stretched over a series of mandrels until the pipe has achieved its desired diameter and wall thickness.