MgB 2 coated conductors (CCs), which can avoid the low packing density problem of powder-in-tube (PIT) processed wires, can be a realistic solution for practical engineering applications. Here we report on the superior superconducting properties of MgB 2 CCs grown directly on the flexible metallic Hastelloy tapes without any buffer layer at various deposition temperatures from 520 to 600 °C by using hybrid physical–chemical vapor deposition (HPCVD) technique. The superconducting transition temperatures (T c ) are in the range of 38.5–39.4 K, comparable to bulk samples and high quality thin films. Clear (101) and (002) reflection peaks of MgB 2 are observed in the X-ray diffraction patterns without any indication of chemical reaction between MgB 2 and Hastelloy tapes. From scanning electron microscopy, it was found that connection between MgB 2 grains and voids strongly depend on the growth temperature. A systematic increase in the flux pinning force density and thereby the critical current density with decreasing growth temperature was observed for the MgB 2 CCs. The critical current density (J c ) of J c (5 K, 0 T) ∼10 7 A/cm 2 and J c (5 K, 2.5 T) ∼10 5 A/cm 2 has been obtained for the sample fabricated at a low growth temperature of 520 °C. The enhanced J c (H) behavior can be understood on the basis of the variation in the microstructure of MgB 2 CCs with growth temperature.