Friday, April 3, 2009

Iron and steel metal composition

Ferro-alloysThere are specific notices in the Tariff regarding the composition of ferro-alloys.To be classified as such, they must be alloys in pigs, blocks, lumps or similar primary forms obtained by continuous casting or in granular or powder forms.

These can be agglomerated, used as an additive in the manufacture of other alloys or as deoxidants, desulphurising agents or other similar usage.They are generally not malleable and must contain by weight at least 4 per cent of the element iron and one or more of:Manganese,phosphorus,silicon,chromium,carbon,copper,nickel,aluminium,boron,cobalt,molybedenu,lead,niobium,titanium,tungsten (wolfram),vanadium,zirconium,other elements

It's also important to note that a ferro-alloy can only be considered as a binary and classified under a specific relevant subheading (if it exists) if only one of the elements listed above exceeds the minimum percentage listed. Otherwise it must be classified as a ternary or quaternary alloy as appropriate.

For example for a ferro-alloy to be correctly classified as ferro-silico-managanese, it must have more than 30 per cent manganese and more than 8 per cent silicon. If it has 7 per cent silicon it is viewed as a binary ferro-alloy and must be classified as ferro-manganese

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