The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
I am unsure if there is anything that this version of Iron Man has to crack or do significant damage to Colossus since colossus has natural armor. Tony would need to do extreme cold to shatter and shatter him or so hot that it could melt him. Maybe a magnetic weapon but that would not make sense since Iron Man is also metal. Iron Man runs out of power before he could do any lasting damage. Tony can fly which is a huge advantage but again, he runs off of juice so he has limits. Colossus wins by simply being more durable and out lasting Tony. Sorry for the long explanation and thank you for reading if you got this far! ( had to think out loud lol)