PURPOSE: To provide a composite blank material which permits brazing in the atm., has high brazing strength and prevents the exfoliation of a sheath material by using Ti or Ti alloy as a core material, cladding an intermediate layer consisting of a specific alloy to the outside thereof and cladding further the corrosion-resistant sheath material to the outside thereof.

CONSTITUTION: The Ti or Ti alloy is used as the core material 1 and the Cu alloy contg. 2.5W50wt% Ni and 0.01W10wt% Sn and/or Al is clad as the intermediate layer 7 to the outside thereof. The sheath material 2 having good corrosion resistance and brazing characteristic, for example, any of an Ni-Cr alloy, Ni-Cu alloy or Au alloy is further clad to the outside thereof. The Ti and Cu alloy diffuse to each other to form Ti-Cu-Ni eutectic in the stage of hot extrusion or annealing and can add strength to joining when such Cu alloy is used for the intermediate layer 7. The abnormal growth of the Cu-Ti layer and the consequent exfoliation are prevented by the Sn or Al component when the brazing temp. is increased too much. The composite blank material for lightweight spectacle frames having good brazing workability and excellent durability and functionality is thus obtd.