Not so quick, Rodney.
Don't forget, "steel" is a generic term that covers hundreds, if not thousands, of specialty alloys.
I don't know what the specs are, but you can be pretty darn certain that the "steel" that is used for armor is NOT the same "steel" that is used for cars, trucks, appliances, etc. etc. etc. It is very possible that we ARE down to only one mill that actually produces the exact type of "steel" that is required.
Even if the armor is a specialty alloy, the troups have been beefing up their Humvees with "scrap steel" from the dump. I cannot believe that a "temporary" armor could not have been produced with run of the mill steel plate that is readily available.
I have a strong suspicion that we are going to find some damn bureaucratic reason why we had to wait for the manufacturer to do the reinforcing.
OK, good point.