Black hollow square steel pipe parameters:Wall thickness: 0.5mm-16mmLength: 5.5 meters, 5.8 meters, 6 meters, 11.8 meters, 12 meters, etc., other length can be selected according to user requirements.External diameter: 6.5 x6.5mm - 400 x400mmTolerance: wall thickness ± 0.05mm length ±6mm diameter ±

THINGS YOU NEED TO KNOW ABOUT BLACK STEEL PIPESWhat is black steel pipe?Black steel pipe is formed by iron oxide in the manufacturing process, so the surface color is black, known as black steel pipe.What is the use of black steel pipe?They are commonly used to transport natural gas and water, to pr