Its 1018. Its typical for cold rolled to do that when machining. You deal with it similar to dealing with welding warpage/shrinkage. It will be fine for what it is. If i could have found a cast iron bar the correct size for less than a first born, i would have used that for sure. Hot rolled is usually pretty good as far as stress goes too. I didn't have the right size in stock and just wanted to keep moving on this project. The next one will be all cast iron.