Rolled rings (also known as seamless forged rings) are hollow metal rings used as starting stock blanks for wheels or rail tires, housings, bearings, gears, valve seats, ring gaskets, and coupling. These products can range in size from small, washer-like rings to large parts over 9 feet in diameter.
Rolled ring manufacturers use a special open die forging process which aligns the grain flow of the metal with the die, producing parts with predictable grain structures. This process ensures a finished ring that is homogeneous, strong, and possesses excellent fatigue and impact resistance characteristics.
A selection of rolled rings. Image credit: Pan Group