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Forging and ring rolling

Closed-die, open-die and rolled rings, on the same site as the melting.

Closed-die	To 300 kg, die-dependent
Open-die	To 300 kg, to drawing
Rolled rings	To 1,200 mm outside diameter
Flange blanks	Rough machined
Condition	As forged, or rough machined with allowance

What decides whether a shape can be formed

Section thickness against overall size — a thin wall on a large ring is harder than a heavy one.
Die availability for closed-die work; a new die is a tooling item with its own lead time.
The grade: Waspaloy and 718 do not run on the same schedule, so a shape that works in one may need a different route in the other.
The inspection requirement — a part that must be UT inspected to a class needs a shape that can actually be inspected.

Ring rolling

Rolled rings are formed with the grain running around the circumference, which is what a flange or a bearing race needs. The alternative — machining a ring out of plate — cuts across that grain and wastes material; it is chosen when the quantity is small, not when the part has to carry load.