The first ring-rolling mill designed and built by Siempelkamp has passed its first test — the initial startup process conducted at the group’s manufacturing plant in Krefeld, Germany. In July, Siempelkamp produced the first steel rings on the mill, which is due to be delivered soon to JSC Metallurgical Plant Elektrostal, near Moscow.

Siempelkamp has designed and built metal forming machinery for decades, mainly closed-die and open-die forging machines, hydraulic presses for sheet metal forming, and hydroforming presses, among others.

Ring rolling is a hot rolling process, in which a ring-shaped workpiece is placed between two rolls that reform it in order to expand the roll diameter while narrowing its wall thickness. It’s a process that has seen increasing demand in recent years, as orders increase for aircraft, IGT, pipe, and pressure vessel manufacturing.

Siempelkamp’s new ring-rolling mill achieves maximum radial and axial pressing forces of 6,300 kN, making it capable of producing precision rings with external diameters up to 2,500 mm and heights up to 600 mm.

Siempelkamp manufactured the mill at Krefeld, assembled it there, and started it up to test the hot rolling process. It stated that the tests proved that mill would meet or exceed the customer’s specifications.

Elektrostal is a specialty steelmaker that produces forgings, discs, hot-rolled and forged bars, stampings, cold-drawn wire, hot-rolled sheet, and cold-rolled strip for both domestic and international distribution. Siempelkamp previously supplied Elektrostal with a 20-mt closed-die forging press, with integrated die heating. That machine will supply some feedstock to the ring rolling mill, according to the builder.

The ring-rolling mill will be installed in Russia at the end of this year and start operation in 2014.