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By certification 
1. Materials: Grade 1, 2, 5, 6, 7, 9, 12, 23.
2. Specification: ASTM B381, AMS 4920
3. Size:
Outside diameter: Forging Disc: Up to 1500 mm , Foring Ring: Up to 3000 mm.
Inside diameter: Forging Ring: 100 mm and up.
Thickness: Forging Disc: 35 mm ~ 150 mm, Forging Ring: 35 ~ 500 mm.
2. Specification: ASTM B381, AMS 4920
3. Size:
Outside diameter: Forging Disc: Up to 1500 mm , Foring Ring: Up to 3000 mm.
Inside diameter: Forging Ring: 100 mm and up.
Thickness: Forging Disc: 35 mm ~ 150 mm, Forging Ring: 35 ~ 500 mm.
