Canadium
Ian
I found this for H13
https://www.hudsontoolsteel.com/technical-data/steelH3
and this for machinability
https://www.suppliersonline.com/propertypages/H13.asp
Very intesting! I found this statement especially really interesting. "Also available as Electro-Slag-Remelted (ESR) and Vacuum-Arc-Remelted (VAR) products as well." I noticed some large pieces have rough textured edges as if they were castings. I will have to check some of the notes on the pieces because there could be some reference there to the related metals discussed on these web pages.