I recently saw the movie “Man of Steel”. In Superman’s fight with Zod, Superman cuts (by melting) a steel I-beam, that Zod is about to hit him with, with a swipe of his heat vision. To melt steel that fast (under 3 seconds) requires a large temperature. My question is how can we calculate the temperature needed to melt (or heat to a certain temperature) steel of a certain mass within a certain amount or time? Basically a temperature vs time and mass function is what I’m trying to achieve.