originally posted in:Halo Archive
I doubt it. In Halo 4, the area around where Infinity's MAC rounds hit the Mantle's Approach is melted. MAC rounds may not be heat-based weapons, but the fact that they caused the hull to melt somewhat proves that they can be damaged by heat-based weaponry.
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If you hit something with enough kinetic force you'll create enough heat to melt steel. Heat is merely the release of energy; some meteor impacts have caused the ground to fuse.