I found this article an thought some would like to see it...
"early as the eleventh century A.D., Persians added chromium to iron to produce a strong type of steel that could be made into tools, armor, and weapons."
https://www.archaeology.org/issues/409-2101/digs/9278-digs-persia-chromium-steel
"early as the eleventh century A.D., Persians added chromium to iron to produce a strong type of steel that could be made into tools, armor, and weapons."
https://www.archaeology.org/issues/409-2101/digs/9278-digs-persia-chromium-steel