These kinds of questions come up frequently, but without a scientific analysis no one can tell you what you have for sure. Rule of thumb, if it made a good spring, it should make a good larger sized blade such as a camp knife, bowie, or other chopper. Edge holding will probably not be as good as other higher carbon steels but for these types of blades that is less critical imo. I have made a number of blades from recycled springs of unknown composition; i just heat treated as if it were 5160 and they have come out ok. I do not recommend water quenching, use oil.