Black steel pipe weight?

assuming it's hollow. 10.68*ID*(OD-ID)

Steel with a surface layer of dark coloured iron oxides used for low pressure hot water heating pipes. <<< Terrible answer      

Black steel depending on schedule can be threaded from 1/8" - 8" Personally I threaded up to 6"

No set answer to that, as steel pipes come in various diameters and wall thicknesses. If you want to be real accurate, they also come in various steel alloys, which do have some difference in density...

The answer depends on the thickess of the pipe.The universal formula for carbon steel pipe weight is10.6802 x T x (OD-T)T=Thickness of pipeOD=Outside DiameterIf your pipe was carbon steel with a...