There is no single diameter - there are steel rods of different diameters for different uses.
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1 bundle 10mm ms rod= how many rod
Im not sure what you mean by a pure rod, but if you are talking about a solid rod, which is simply a cylinder, you can calculate its area as follows: πDL+(πR²)2 Which is pi times the diameter times the length plus pi times the radius squared multiplied by 2.
"Solid Steel" would not be a pipe- it would be a rod. Weight of pipe will vary depending on the thickness of the wall of the pipe.
Answer
for density of steel @ 7850 kg/m3 you can use No of bars (12 m long) per ton = (13500 / D2) where D= bar diameter in mm