This weekend I forged my first damascus billet 1080 and 15N20. After the initial forging, I placed the billet in the vermiculite to cool overnight. The next day I went to clean the billet and cut and re-stack it, and there was a thick black crust (flux I think) on the outside which was very hard to grind off.
First ?, is this normal?
Second if so is there an easer way to clean it off? should I grind it off while the billet is hot?
thanks for your advice.
Greg