Jut not enough carbon there to create a usable blade. With a RR spike I suspect your closer to .030% carbon than .040%. To give an example, .040 is about the amount of carbon contained in a common wood screw, which can be easily twisted off/broken. Even with "Super Quench" you'll likely not get much more than an Rc hardness of 50, which will not hold an edge.
RR spikes are neat little things to practice on, and make interesting decorative things, but they do not make decent knife blades.
The basic steps to achieve a completed knife would be:
1. Hot Forge
2 Normalize/Thermal cycle
3. Anneal
4. Rough Grind
5. Harden
6. Temper
7. Finish/assemble
For anything below .050% carbon, I would recommend to only do a "stress relieving" heat/temper at 350F, anything higher than that and you will be softening the blade.
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