Basic ton - "given" the weight of the basic element or elements. The size of the virtual, not real, but it is very convenient for calculations.
In practice, used to calculate prices and the balance of large (relatively "inexpensive") ferro-alloys. As in the case of alloying ferroalloys, price and quality of large-capacity such as ferrosilicon, ferrochromium, ferromanganese, as determined percentages of their constituent basic elements.
The difference is that the price is not fixed for the basic element, and a reference. The standard in this case is the party ferromateriala with "basic content" core element / elements. "Basic contents" for each ferroalloy - a constant, for example, for all of ferrochrome - is 60%, for ferrosilicon FS45 - 45%, etc.
Thus, any party can submit ferroalloys (by conversion) as a batch of the same ferroalloy, but with the "basic content". Moreover, if the content of the element in the party over "the base", the "basis weight" is over, and vice versa. For example, 1000 kg FH100 ferrochromium with a chromium content of 66% equivalent to 1100 kg FH100 ferrochrome with chromium content of 60% (66/60 * 1000).
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