Brass is generally used in heatercores for the tubes. If you look at the half tube on the edge of every heatercore, it is easy to see that the thickness is less than .5mm. If I had some dial calipers I would measure the thickness. The shape of the tubes also seems to give them more strength than straight tubes, plus they are made of brass which is stronger than aluminum.
Brass is also not prone to galvanic corrosion when combined with copper plus it is simple to solder to copper, so it is easy to see why it is used in radiators.
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