7. Put the piece into the severest fire you can find. A gas burner will work. Any gas stove will work, just neglect preparation of hard boiled eggs and place the steel onto the burner. Use some wire to hold it if you haven't got a wrench or a similar device. The thing gets red in two minutes.

Put it in a bucket of water and place it aside to cool. It is a very hardened piece of steel now.

It is TEMPERED.