I agree with Al in that 36 grade material will survive with a small amount of hardening, but it isn't a good practice for a shop to get into cooling off with water....I realize that it moves a bit quicker when you quench it with water but it isn't good shop practice, IMHO. At least let the color fade out (1000F) of it before letting the water dance off of it, better yet once it gets down past 500-550F it would be better.