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I expect you already know this.
To harden heat to red hot and drop it in water. You then need to temper the item.
To do this.....
Polish the item back to metal.
Heat slowly and look for the colour appear. When you reach the appropriate colour drop the item in oil.
Straw to brown is probably where you need to be but remember as it goes blue you are making something as brittle as a file... I have a colour chart some place and if I can find it I will post it but there must be something on the net...
But you may only have case hardened steel in which case hardening and tempering is not going to work.
alex
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