СONTROLLED COOLING UNIT (UKO)

     Controlled cooling unit (CCU) is intended for the accelerated controlled double-sided cooling of breakdown bars with thickness of 6:50mm up to the preset temperature while controlled rolling for the purpose to provide the required mechanical properties in the specified cooling speeds range. Breakdown bars cooling in the Controlled cooling unit allows to achieve the required mechanical properties of the breakdown bars with the lowering of alloy elements costs at steel melting and reduction of production costs for plates heat treatment in the furnaces.

Controlled cooling unitprovides:

- speeds range of strips cooling - 3:40°С/с;
- temperature of the breakdown bars at the exit of the Controlled cooling unit.

ROLLER QUENCHING MACHINE (РЗМ)

    Roller quenching machine (P3M) is a thermo strengthening device and is intended for double-sided quenching of sheet products with thickness of 3:30mm by water, after its heating in the end-charged end-discharged roller hearth furnace.

Sheets quenching in the РЗМ provides:
• - forming of martensitic, martensitic-bainite and austenitic structures in the surface layer with depth from 3 to 15 mm. By doing so the cooling speed makes 20:80°С/s and sheets temperature at the exit from РЗМ no more than 50:70°С;
• - uniformity of quenched sheet mechanical properties over the sheet area within the range of yield point value is +15 MPa (1,5 kg/mm2).
• - accuracy of mechanical properties obtaining in the sheets lot is + 20 MPA (2,0 kg/mm2);
• - quenched sheets flatness no less than ПН, ПВ according to GOST 19903-74 or its analogue as per foreign standards.

Roller quenching machines were supplied to:
• - forming of martensitic, martensitic-bainite and austenitic structures in the surface layer with depth from 3 to 15 mm. By doing so the cooling speed makes 20:80°С/s and sheets temperature at the exit from РЗМ no more than 50:70°С;

HEAT SHIELDING UNIT

  The important factor of the upgrading of rolling mills economic efficiency is the economy of raw materials, fuel and energy. Energy-efficient technologies are realized on NKMZ mills by means of direct rolling hot charge and shielding of the transfer bar on the intermediate roller table.   Entry and exit temperature difference reduction by 40-60°C along the length is achieved by means of shielding.
  NKMZ has designed and produced more than 100 coilers particularly universal which are used for reeling of strips with width from 1,2 up to 30 mm of different steel grades.
  New generation of our coilers is three-roll-type coilers with the hydraulic "follower" drive of the coiler rolls. Coilers are equipped with the rigid three position block and provide the qualitative strip reeling.

REFERENCE LIST
List of metallurgical equipment produced and supplied by JSC NKMZ

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