As per that article
http://materials.iisc.ernet.in/~woot...tage/WOOTZ.htm
the average weight of an ingot was 2.3 kg. The ones I saw advertised for sale ( Artzi's site and other) were 300-800g.
Khorasani wrote that less than 300 g of iron was put into the crucibles and did not mention any variability. Anosov made ingots as heavy as 5 kg, but recommended not to exceed 3-4 kg limit, as it compromised the quality.
So, if the blade of a shamshir weighed ~600-800 g, and assuming even a 50% loss, a 3 kg ingot was sufficient for 2 blades. Of course, smaller ingots were used for kards, khanjars etc.
The article I cited above indicates that tens of thousands of ingots were shipped annually from the Coromandel coast ( only one source of origin !) to Persia.
It should have been enough to produce all the blades manufactured in Iran and still leave plenty for re-sale. Thus, there was no impetus for the Iranians to develop their own metallurgy. This also explains the sudden cessation of wootz blade manufacture in Iran as soon as the British killed the wootz industry in India.