Salting and rusting elbows on a new-in-august furnace is not normal. No one here can tell you what the problem is without knowing a whole lot more information. However, I'd start by looking at the possibility of short cycling. How long does the furnace run each time it runs? The B vent doesn't need to project above the peak of the roof unless it's less than 8' from a vertical wall - then it need to run above that wall. If it's just on a sloped roof, the distance it has to extend depends on the slope. Here's a chart:
source https://www.inspectorsjournal.com/topic/5991-white-powder-around-gas-vent/?do=findComment&comment=178234
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