Big Size gear ring for wind power, petrochemical industry Features: Big Size gear ring for wind power, petrochemical industryCeritification: TUV, ISO9001 Standards: ASTM, ... forge the maximum outside diameter: 3, 200 mm Ring forging can forge the maximum outside diameter: 4, 000 ... 4, 500 tons, 2000 tons of oil hydraulic press, 3800NC ring-rolling mill and nondestructive inspection equipment as well ...