That depends. If good quality chain, and you hit the nail perpendicular to the bar, it will often times cut right through without really hurting the chain. If the nail is more close to parallel to the bar, will more often take the chrome way back esspecially on all the teeth on the one side. Then I usually pitch it. So really depends how far back you need to file to get to good chrome, and how much tooth will be left when you get there.
And welcome to AS