... Die Forging, Main Shaft, Wind Power Shaft, Stabilizer, Flange, Coupling, Shell, Hydraulic Cylinder Forging, Roller Forging, Ring Forging, Gear Blank, Gear Wheel. 2. Materials ... Report 7. Specifications of Forging:Shape Diameter(m) Length(m) Shaft ≤2.5 ≤15 Block ≤4.0 / Ring ≤4.9 ≤3 ...