|That's pretty high as far as things go. For reference...
304 stainless is ~16 W/m-K
Powder coat would be ~1-2 W/m-K
mild steel (stock pipes) ~50 W/m-K
6061 aluminum ~160 W/m-K (much less than the pure metal)
So an aluminum tube with a thin layer of chrome that is about 2/3rds as conductive is going to suffer very little thermally. Even if the plating didn't achieve the full 94 W/m-K (alloying, microstructure, etc) it's still a small overall change by the rule of mixtures compared to steel piping and much much better than powdercoated aluminum.