A transformer HDG (Hot Dip Galvanized) radiator with coating refers to a radiator that is made from a galvanized steel material and has an additional coating applied to it. Hot Dip Galvanizing is a process where the radiator is dipped into a bath of molten zinc, which forms a protective layer on the surface of the steel. This galvanized coating helps to prevent corrosion and rusting, making the radiator more durable and long-lasting. The type of coating used can vary depending on the specific requirements of the transformer and the operating conditions it will be subjected to. Common types of coatings used for transformer HDG radiators include epoxy, polyester, and polyurethane coatings.