I wonder if there was really that much money to be made in large amounts of scrap armor right after the war? There was a military surplus dealer about an hour out of Winnipeg a number of years ago who bought 6 surplus Shermans in the late 1960's because he figured the weight in scrap steel would more than cover the costs of the vehicles. Turned out the foundries wanted the steel in small chunks and paid a very low price because the armored steel took a lot more time and effort to melt and rework to make it compatible with general steel scrap. The dealer also spent a fortune in acetylene cutting the Sherman's up. Worst investment he said he ever made.
On the other side of the value coin, however, I remember reading an article a while back dealing with the design of sophisticated research equipment where accurate measurements of radioactive isotopes were required. Apparently, ever since we started exploding atomic weapons in the atmosphere, all metals we produce contain radioactive contaminants which will corrupt any readings from any equipment we make. Someone in England then remembered that the Imperial German Battle Fleet that they scuttled at Scapa Flow after the First World War all had armor plate manufactured in the pre-Atomic age and a number of these warships have been salvaged over the years to provide this nice clean metal. We probably could have done the same thing with surplus Tigers and Panthers today, if they were around in any numbers.
David