|Plain Carbon Steels||10XX||1075, 1084, 1095, Etc.|
|Nickel Chromium Steels||3XXX||3150|
|Low Chromium Steels||51XX||5160|
|Med. Chromium Steels||52XX||52100|
|Chromium Vanadium Steels||6XXX||6150|
|Silicon Manganese Steels||9XXX||9160|
I just wanted to post this to give some meaning to the numerical system for different alloys. The first numbers designate the main type of alloy, such as Nickel and the last numbers are usually the amount of carbon. For Example, good ol' 5160 is a Low Chromium steel with 60 points or 0.60% Carbon.
I thought some of you may find this helpful in explaining the designations for some of the steels we work with.