Mass per Meter Run in Kg
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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.
how many steel bar in one ton
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
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
A bar is a unit of pressure, not a unit of weight, nor of mass. A bar is 100,000 pascal, or 100,000 newton / meter2.