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Home Industrial Technologies Descaling of Hot Rolling Billets with Pulsating Water Jets

Descaling of Hot Rolling Billets with Pulsating Water Jets

Description

One way to descale hot rolling billets is to use high-pressure steady water jets. In the hot-billet descaling technology proposed at the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the National Space Agency of Ukraine, the steady flow at the inlet of the water descaling header is transformed into a pulsating high-frequency, high-amplitude flow at its outlet. To do this, the cavitation generator of hydraulic pressure oscillations developed at the Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the National Space Agency of Ukraine is used. In hot rolling (Fig. 1), the pulsating high-frequency, high-amplitude flow at the header outlet is fed onto the surface of the moving hot billet. For certain operating conditions of the cavitation generator, the dynamic action of the pulsating jet (Fig.2) provides high-efficiency descaling.

Innovative Aspect and Main Advantages

The use of the cavitation generator of pressure oscillations, which has no moving or rotating parts. The water pulsation frequency can be controlled in the range between 100 and several hundreds of hertzs. The pulse pressure is 2 to 4 times as high as the steady pressure at the cavitation generator inlet.

Pulsating-jet descalers reduce the rolled-in scale rejection rate by a factor of 2 to 5 in comparison with steady-jet ones.

Areas of Application

Rolling.


Fig. 1


Fig. 2

Stage of Development

Design documentation has been prepared, and water descales have been made and introduced at the Vyskunsky Metallurgical Works (Russian Federation), the Orsko- Khalilovsky Integrated Iron-and-Steel Works (Russian Federation), the Zaporozhstal Works (Ukraine), and the Kommunarovsky Integrated Iron-and-Steel Works (Ukraine).

Contact Details

Institute of Technical Mechanics of NASU and NSAU
Contact person: Oleg V. Pylypenko, Prof., Director
Address: 15, Leshko-Popelya str., 49005, Dnepropetrovsk, Ukraine
Tel.: (+38 0562) 471 235, (+38 0562) 473 413

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