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HOT ROLLING MILLS

  Over 80% of hot-rolled sheet in CIS is made at wide-strip mills of NKMZ production.
  In the programme of NKMZ constant attention is being given to improvement of these mills design. It is due to high share of hot-rolled flat materials in the world production and because of growing of user's requirements for their quality.
  In the process of hot rolling technology development carried out is a search for most optimum design of wide-strip mills providing for fulfilment of requirements for power saving, capital investments reduction, technological potentialities widening and raising of automation level. 		Hot rolling mills
  One of the latest developments of NKMZ - new universal semicontinuous wide-strip mill 2500 mm, fitted with modern backup facilities and production control systems, annual capacity of which is above 5 mln. t of strip of various steel grades including special ones.
  Besides procedures conventional for wide-strip mills here can be achieved controlled rolling which allows the rolled materials with mechanical properties of low-alloy steels to be produced from ordinary grades of steel.

 

DIAGRAM OF SEMICONTINUOUS WIDE-STRIP MILL 2500
Diagram of semicontinuous wide-strip mill 2500
  1. Zone of heating furnaces;
  2. Two-high reversing mill stand;
  3. Four-high reversing mill stand;
  4. Intermediate roller table with thermal shield system and controlled cooling;
  5. Flying shears;
  6. Finishing stands group;
  7. Delivery table with strip cooling system;
  8. Universal coiler.
Inital billet:
  - thickness, mm 250
  - width, mm 1350 - 2400
Weight, ton 50
Dimensions of hot-rolled strips in coils:
  - thickness, mm 2 - 25
  - width, mm 1200 - 2250
Rolling mill yield, mln. t/year 5


  More economic and less capital-intensive rolling mills of small capacity are coming into ever increasing use; among them are in particular rolling mills with coilers in furnaces (Steckel mills). NKMZ has made three of such mills.
  In our design concept of new generation Steckel mill we adhere the conventional set of equipment with reversing rougher, ensuring in this case high quality of rolled strip.

 

Diagram of rolling - mills with furnace coilers
Diagram of rolling-mills with furnace coilers
  1. Zone of continuous heating furnaces;
  2. Four-high universal roughing stand;
  3. Flying shears;
  4. Furnace coiler, front and back;
  5. Four-high finishing stand;
  6. Zone for strip coiling and handling.
Initial billet:
  - thickness, mm 120 - 175
  - width, mm up to 1850
Weight, ton up to 10
Finished strip:
  - thickness, mm 2 - 8
  - width, mm up to 1850
Rolling mill yield, mln. t/year up to 800


  More than 10 hot rolling strip mills NKMZ designed and supplied for enterprises of aluminium industry. The most unique of them is semicontinuous 2000 mm mill for hot rolling of coils and heavy-gauge plates from aluminium and its alloys for Krasnoyarsk Iron and Steel Works with an annual capacity of 1 mln. t. Hot rolling mills
  Heavy reduction ability, high degree of automation, modern technology and facilities make it possible to produce a wide range of products with required level of surface quality, mechanical properties and allowances for geometrical dimensions.

 

Diagram of 2000 mm semicontinuous wide-strip mill
Diagram of 2000 mm semicontinuous wide-strip mill
  1. Area of ingots preparation for heating;
  2. Furnace section;
  3. Rolling mill line;
  4. Handling group;
  5. Plates cutting station.
Initial billet:
  - thickness, mm 290 - 700
  - width, mm 1000 - 2200
Weight, ton up to 22
Thickness of hot-rolled strips, mm: 2 - 16
Heavy-gauge plates dimensions:
  - thickness, mm 10 - 90
  - width, mm 1000 - 2700
  - length, mm 4000 - 30000
Rplling speed, m/sec up to 10
Rolling mill yield, mln. t/year up to 1


  For production of small quantities of rolled materials from aluminium and its alloys proposed is a single-stand reversing mill with coilers in front of stand and behind it.
  The advantages of such system lie first of all in functions division of roughing and finishing rolling ensuring production of more accurate and high-quality strip owing to temperature control and tension rolling during last passes.

 

Equipment of reversing stand area
Equipment of reversing stand area
  1. Equipment of continuous heating furnaces zone with chamber for hydraulic descaling;
  2. Four-high roughing stand;
  3. Four-high finishing stand;
  4. Plate leveller;
  5. Cooling bed;
  6. Crop shears;
  7. Edge trimming shears;
  8. Inspection bed;
  9. Plate piler.
Initial billet:
  - thickness, mm 300 - 400
  - width, mm up to 1800
Weight, ton up to 10
Finished products - strip coils:
  - thickness, mm 4 - 12
  - width, mm 1000 - 1800
Coil weight, ton up to 10
Plates and heavy-gauge plates:
  - thickness, mm 10 - 50
  - length, m 2.5 - 10
Rolling mill yield, th. t/year 150


  For needs of machinebuilding, aviation, shipbuilding, manufacture of large diameter gas pipes NKMZ designs and produces plate mills for plates and heavy-gauge plates up to 5000 mm wide from carbon, low-alloy, high-strength and stainless steels as well as from aluminium and its alloys.   In order to finish and heat treat the rolled material provision is made for levellers, defectoscopes, side shears, slitting and crop shears, marking and stamping facility, units for precooling and speed cooling of transfer bar in finisher, normalizing-cum-hardening and temper furnaces, roller quench furnace.
  An the customer's request we furnish equipment both for new and reconstructed plate mills with the parameters below:

Length of rollers barrel, mm 2000 - 5000
Thickness of plate, mm 4 - 50
Thickness of heavy-gauge plate, mm up to 300
Max. plates length, m up to 30
Rolling mill yield, mln.t/year up to 2.4

 

COST EFFECTIVE PLATE ROLLING MILL 2800 MM AND IN-LINE ENGINEERING LAYOUT
Cost effective plate rolling mill 2800 mm and in-line engineering layout

  One of the promising trends in the development of new energy-saving, economic and ecologically purer technologies is manufacturing of hot-rolled products with casting and rolling processes combined.
  NKMZ is prepared to propose to their customers: Technology and equipment permitting sheet production on the continuous-casting direct-rolling facility (CCDR) incorporating in one technological row a thin slab continuous casting machine, end-charged end-discharged furnace and hot-rolling mill with the capacity up to 1,700,000 t/year.

Incoming billet:
  - thickness, mm 50
  - width, mm 900 - 1550
  - length, mm up to 50
Hot-rolled strip thickness, mm 1.8 - 12
Rolling speed, m/sec up to 10
Specific coil weight, t/m up to 19

 

CCDR facility with Steckel mill with the output of 500,000 t/year
CCDR facility with Steckel mill

 

CCDR facility with continuous mill train with the output of 1,000,000 t/year
CCDR facility with continuous mill train

 

MANUFACTURE OF HOT-ROLLED METAL PRODUCTS ON NKMZ EQUIPMENT
Hot rolling mill production