4. A hydraulic forging press is capable of exerting a maximum force = 1,000,000 N. A cylindrical work part is to be cold upset forged. The starting part has diameter = 30 mm and height 30 mm. The flow curve of the metal is defined by a strength coefficient = 400 MPa and strain hardening exponent 0.20. Determine the maximum reduction in height to which the part can be compressed with this forging press if the coefficient of friction = 0.1