I did not see any thing to help understand the application of this material. How can you say it's good or bad if you have no idea what it's function will be?
516 GR70 is not a hardenable material as compared to some like 4140 and not likely but possiblely been set to a condition (Quinched & Tempered) I am not sure even that would make it hard. If so, you must know that condition to determine what repairs would be required. If the material was purchased in a Normalized condition then you may only need to bring it to a uniforn temperature and allow it to slow cool.