Primetals delivered continuous caster + secondary metallurgy facilities to MMKI
by Hans Diederichs
The two-strand caster CC4 is designed to produce 2.5 million metric tons of slabs per annum. This increases MMKI's annual production capacity to around four million metric tons, as well as enhancing and expanding its product portfolio to include, for example, HC, UHC and ULC steels. A level 3 heat-pacing solution coordinates the steel production with the casting operation.
MMKI produces steel with three LD (BOF) converters. A new 150 metric ton twin ladle furnace from Primetals Technologies and the associated alloying station help to set the desired steel grades and the correct casting temperature. Due to an Industry 4.0-ready automation on Level 1 and Level 2, this can be done via pre-selectable process models. A transformer with a rated power of 28 MVA provides the electrical energy for the ladle furnace, enabling a heating rate of 4.5 °C per minute. This heating rate and the guaranteed energy consumption value have been over-fulfilled during start-up.
Primetals Technologies designed a dedusting system to clean the off gases from the ladle metallurgy facility. This improves the environmental situation in the city of Mariupol, where MMKI is located. The dedusting system reduces the dust content in the off gases to a level of 12 mg/m3 (maximum), whereas the Ukrainian standards require up to 50 mg/m3 and the European standards up to 30 mg/m3.
The equipment order for the continuous slab caster covered all the installations from the ladle turret and the tundish car through to the exit zone with its weighing, torch cutting, marking and deburring machines. The caster from Primetals Technologies has a machine radius of nine meters and a metallurgical length of 29.8 meters. It casts slabs with thicknesses of 170 and 250 millimeters in widths ranging from 900 to 1,550 millimeters. The maximum casting speed is 2.2 meters per minute. It processes peritectic and peritectic alloyed steels, low, medium, high and ultra-high carbon grades, as well as medium-carbon alloyed steel. The caster is equipped with automatic LevCon mold level control, a straight, cassette-type Smart Mold with the DynaWidth technology package to automatically adjust the width of the slab online, and the DynaFlex mold oscillator. The strand guide is equipped with Smart Segments and I-Star rollers. DynaGap Soft Reduction, the Dynacs 3D secondary cooling model, and DynaJet nozzles was also installed, making it possible for MMKI to produce a wide variety of high-quality grades with improved interior quality of the slabs.
Source and photo: Primetals Technology