Thank you for your comments. I plan on getting a real anvil eventually but this one was free. And the machinist who made has no smithing experience and this came from 6" round stock so he couldn't do a proper horn with the piece of scrap he had but all in all it has two 90 degree edges and two curved. But The only information that he gave me was that it's called 3311 and it's similar to 4140 Timken makes it specifically for the tooling i don't know if there is a spec sheet for it! So what would anyone else do heat treat or no?