Black steel pipe is the use of hot rolled steel sheet into the forming process. And welding with high frequency Accomplished as a black steel pipe Therefore, the black steel pipe will be a seam pipe. Most of them are characterized by Electric Resistance Welding (ERW) with a standard length of 6 meters. The black steel pipe is popularly used in structural work. Used as a conveyor Various forming work And general industrial work The general size of the black steel pipe Will be from 1/2 ″ – 24 ″ and the thickness will range from 1mm – 15mm.