... , forging flange 3)open die forging 4)Precision Processed With 3200 and 1600 Tons of hydraulic machine, 5 Tons ... requirements to the material of products.All the materials comply with GB, JIS, ISO, ANSI, ASTM, BS, DIN, etc. standard, ... best quality for customers, ensure our strict quality control system will conduct throughout the entire production. carbon steel forged flange with new technology