While that list is a nice thing, I have to say that for the most part it simply does not apply.
10-15 years ago it was fairly accurate, (I can remember a very similar list from my early days of forging) but with the massive changes industry has made in the last decade towards using the cheapest materials that will meet the required specs, much of it is misleading.
For example, these days you will find more bearings, both ball and roller that are case hardened than are made of 52100. Many other items on that list have changed year to year over the past decade too. Modern (with in the last 10 years) versions of Hammers, jackhammer bits, wrenches, all types of springs, as well as the mechanical items mentioned in that list are now often widely varied from the materials in the list.
That is part of the reason that many of us will tell folks to purchase new, known steels. The other reason is that there is very little "new" steel being made in this country now a days...most of it is "recycled", and the steel companies simply cannot control the content well enough for it to be the level of quality that it was 10-15 years ago. An example is the steel sold by Admiral, that is labeled 1075/1080. The reason it's labeled as such is because it is not "pure" enough to be labeled "1075" or "1080" indivdually, but the tolerances MIGHT fall within the upper and lower limits of the those two steel types.
This might be falling on deaf ears, but it's hard enough to obtain high quality steel these days, even purchasing it new. So why would you want to handicap yourself by not knowing exactly what steel your working with? It might seem like you saving $$, but in reality, many times your just spinning your wheels, and causing yourself grief unnecessarily.
The ONLY exception I would make is an instance where an individual KNOWS 100% exactly what steel they have in a recycled item, AND they have a large or constant supply of it. The final caveat to that is that you need to check on the material the item is made of...it may very well change from one production run to another.