Black Iron Pipes vs. Black Steel Pipes:Black Iron Pipes: Black iron pipes are a common name for ordinary welded steel pipes. The word "iron" retains a historical meaning (they actually refer to low-carbon steel). They are primarily straight-seam electric resistance welded (ERW) pipes and have a lower cost.Black Steel Pipes: Black steel pipes refer to various black steel pipes in their raw state without anti-corrosion coating. They can be used as pipelines or structural compon...