From the CIA reading room website comes this 1953 report on the Tank and Assault Gun Industry of the USSR. This is a pretty substantial report, coming at in over 60 pages. Given the age and nature of this CIA report, obviously not everything found in its pages will be accurate. However, it is a rather interesting in piece in that it shows what exactly the US thought it knew about Soviet AFVs and AFV production at the time. There are quite a few tables in this report, with production numbers as well as charts showing the amounts of different types of metals used in Soviet tank production. Below is an example of this sort of chart. The report can be downloaded in PDF format here.