Deejay wrote an answer about GSI Outdoors Hard Anodized Dutch Oven on October 20, 2009
Hard anodizing is an electrolytic process used to increase the thickness of the natural oxide layer on the surface of the aluminum. Since this is only a surface treatment, I'd guess that the melting point is not changed. However, the melting point of the oven material may be higher or lower than that of raw aluminum, 1220 deg. F., due to addition of alloys.