The organization of materials will be higher internal pressure and density increase, more uniform, mechanical properties improve greatly.
Casting is the process where metal is heated until molten. While in the molten or liquid state it is poured into a mold or vessel to create a desired shape
Forging flange must be heat treatment, withstand the shear strength and tensile force higher than coasting parts
Mechanical performance, internal organization is better than casting flange. Not also can appear grain big or not all, cost higher than casting flange
Forging flanges carbon is not easy to rust.
Handle impact better
Higher structure for mechanical performance.
Great wear resistance
But it is expensive for open die
Limited by size