I have a grill with a set of cast iron grates. I seasoned the grill grates
as recommended. But as much as I try to oil and keep them oiled after use,
they still have rusted, particularly where the heat of the coals is the
hottest. They grilled so nice when I first got them last year, but now they
impart a grittiness to my steaks (rust particles -- high in iron!), and they
are flaking as well.

Before I look for chrome replacements, is there a way to keep this from
happening with cast iron?