With the aluminum alloy inner grooved heat transfer tube

Tube bending excellent workability, crushed fins hardly occurs, further clarify the superior heat transfer tube corrosion resistance. A plurality of ridges type fin is formed on the inner surface, Mn: 0.8 to 1.8 mass% (hereinafter, the mass%,% and wherein), Cu: 0.3 to 0.8%, and Si: containing 0.02 to 0.2%, provide a balance of Al and unavoidable impurities, and aluminum alloy inner surface grooved heat transfer tube, wherein the average crystal grain size of the molded article is 150μm or less to.