Sold this for 20+ years, Made in Canada here
http://www.algoma.com/products-and-markets/?C=64
AR 500 is this
http://www.essarsteelalgoma.com/media/C - EssarHTPWeb11-12.pdf
Now known as AlgoTuf 500 The AR stands for abrasion resistant so no real ballistic tests performed or claimed. It can be ordered with impact tests and as stated in the info will typically obtain 20FT/LBS @ -40F (CAT 3)
Applications include heavy earth moving equipment, forestry equipment, typically in high impact applications (scoop bucket leading edges, ground breakers, felling heads)
My customers used a lot of QT100 The AR500 was used very sparingly due to cost and difficulty in processing.
We cut silhouette targets for local Police and RCMP QT100 for pistol AR500 for Rifle
You can weld lugs on the back for chain. It requires a low Hydrogen rod and pre heat. this will lower the steels properties in the area of the weld.
If ordered with mill test certs the heat number will need to hard stamped into each part for range purposes this can be on the edge. We shipped this with tests and stamps on every part as it @ that time it fell under the pressure vessel rules.