Take steel density at 7.85 g / cu. cm.
One bar = pi * 0.62 * 600 * 7.85 = 5327 grams / bar = 5.327 kg / bar
1 short ton (2000 pounds) = 907.18 kg, so 907.18 / 5.327 = 170.3 bars
1 long ton (2240 pounds) = 1016 kg, so 1016 / 5.327 = 190.73 bars
1 metric tonne = 1000 kg, so 1000 / 5.327 = 187.72 bars
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Oh, dude, you're really getting into the nitty-gritty here. So, technically, there are about 907 steel bars in one ton of 12mm diameter bars that are 12 meters long. But like, who's really counting, right? Just throw 'em in there and call it a day.
Mass per Meter Run in Kg
You first need to find out what the pieces are. 12 mm is a measure of length. Length, by itself cannot be converted to an equivalent mass.
one
It is dependant on the size of the bar in question. Smaller bars have a smaller diameter and therfore more are required to equal a ton. Larger bars have larger diameters and less are required to make up a ton. Find the size you are looking on chart below than reference size to weight per foot so you can determine how much per ton. Chart can be found at http://www.rebarapps.com/ARA_Links.html