Originally posted by ScreamPasteYou are making a general statement. The more focused the heat at the point of impact, and the hotter its temperature, the less time it would take to damage an object.
Edit; my point about heat conduction stands, you can only conduct heat into matter so fast, prolonged contact is necessary for real life-threatening damage to occur.
Its academic, really, since we have examples of Mega Man's blasts destroying titanium (yes, titanium this time) as well as more durable materials.