When you heat with wood, you end up with a lot of old chainsaw files. They make excellent scribes and center punches. They generally are quite hard and the fine teeth of the file gives a positive grip.
For scribes, I cut off the tang and cut to the desired length. I grind a fairly sharp angle (15 -20 degrees) on the opposite end.
For center punches, I cut them in half and sharpen to the desired point and heat the struck end to draw the temper to a deep blue to grey. I grind a sharper angle than normal to use as a prick punch prior to using a traditional center punch. The fine point and sharp angle allows me to hit the scribed center point more accurately.
When grinding, take it slow with frequent cooling to avoid drawing the temper.