You can look it up to confirm, but I believe when damascus mentions silver steel, it is sold in the US as O-1 drill rod. The thought above about using a magnet is not a bad idea, when it becomes nonmagnetic, literally no attraction. MAPP will easily do it, waive the flame and rotate the pin if you can.
Hold your firing pin with some stiff wire also so whatever tongs or pliers you might use, doesn't trip the magnet. Damascus is correct in describing the color you are trying to see as somewhat subjective, that is why the magnet strategy might make things easier. You can also stick the firing pin in a toaster oven cranked to 500* for an hour to temper it, instead of trying to watch for a particular color. A side benefit might be that you don't have to polish it to temper it?
If you have a fastenal store close by, they probably have the drill rod in stock. damascus has probably done a million of them, but you can start the material removal with a course file and switch to your fine cut things when you get close to save a good bit of time? Best of luck.
