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It is also suggested that the Chinese used reed pipes for transporting water to desired locations as early as 2000 B.C. Development of the modern day welded steel pipes can be traced back to the early 1800s. In 1815, William Murdock invented a coal burning lamp system.See all results for this questionWhat kind of pipe is black in color?What are black steel pipes? Black steel pipes are made of steel that has not been coated with a substrate such as zinc or paint. Since it has a dark color surface that is forms by iron oxide during the manufacturing process, it is called black steel pipe.See all results for this questionWelded Carbon Steel Pipe - HEBEI YONGQIANG PIPELINE CO china carbon erw black steel weld pipe erw black RollingChina Welded Carbon Steel Pipe catalog of LSAW/SSAW Steel Pipe and Tube, Mild Carbon Steel Straight ERW Welded Black Steel Round Pipe provided by China manufacturer - HEBEI YONGQIANG PIPELINE CO., LTD., page1.

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