The steel in the pot will hold up to the heat, but the blue enamel may not. But, inasmuch as the pot should never be used for cooking after being used to melt lead, it does not matter if the enamel flakes off from the heat...it will just float on top of the melt. However, you would be better off with a cast iron cooking pot to melt lead. Years ago, I found a new cast iron sauce pot in my local hardware store that I used for many years to cast bullets on top of my gas range.