Abstract: Combined with the production practice of C19210 copper alloy special-shaped strip in enterprises, which consists of continuous extrusion, three-stand continuous rolling, bell-type isothermal annealing, cold rolling, continuous annealing, finishing rolling, the two annealing processes in the process scheme were studied. The results show that for the C19210 copper alloy, the first bell-type isothermal annealing at 500 ℃ for 20 h is better. After that and then cold rolling, the conductivity of the special-shaped strip is about 89%IACS and the hardness is about 120 HV0.5. However, obvious non-uniform properties between the thin part and the thick part of the strip occurs after the second continuous annealing. When isothermal annealed at 450 ℃ for 2 h, the properties of the thick and thin parts are uniform, and the conductivity of the strip after finishing rolling reaches 90.1%IACS, the hardness keeps about 120 HV0.5. Finally, the feasible preparation process of C19210 alloy special-shaped strip is adopted as follows: continuous extrusion, three-stand continuous rolling, bell-type isothermal annealing at 500 ℃for 20 h, cold rolling, isothermal annealing at 450 ℃ for 2 h, and finishing rolling.

Key words: C19210 copper alloy, special-shaped strip, heat treatment, conductivity, hardness