Structure of “Promet Steel” JSC comprises the following elements:
- Production Units:
- Rolling mill 300;
- Cut-and-bend shop
- Repair services:
- Chief Mechanical Engineer Service;
- Chief Power Engineering Specialist Service;
- Automated Systems of Production Control Service.
- Sales Backup Service:
- Railway Shop – 4 locomotives;
- Dispatch Service – loading/shipment of products
7 sections of Chief Mechanical Engineer Service allow practically full technical servicing and maintenance and current repairs in the enterprise, along with high quality of the works performed. This is well confirmed by the positive tendency in reducing mill’s idling time.
4 sections of Automated Systems of Production Control Service provide for mill’s faultless performance do to electronic equipment.
3 sections of Chief Power Engineering Specialist Service.
Rolling Mill 300 allows production of the whole range of reinforcing steel bars 8-40 mm to different standards, round bars of construction steel ф 10-60, equal leg angles L25 to L50 mm, flat bars 30 х 5 mm to 80 х 15 mm. In the meantime, there is implemented production of steel channels and beams №№ 8 – 12.
Production capacity of the mill is 800 thsd. ton per year.
Production process of the mill 300 contains the following components:
Steel Billets Warehouse
Steel billets are delivered to the warehouse with automobile transport. Total warehouse area for storing steel billets equals 23 thousand square meters, which allows storing 108 thousand tons of steel at the same time. Size of commercial steel billets, used for the rolling mill, varies from 100x100 mm to 200x200 mm with maximum length of 12 000 mm. There are machines for straightening billets, assembled in the warehouse.
Heating of steel is performed in two thermal coves with walking beam bottom, with maximum capacity of 120 ton per hour each. The coves are loaded from a side by means of cove charging rollers and are unloaded from the end of unloading machine. The coves operate by turns.
Rolling line consists of 32 rolling stands, being in operation, and 26 spare stands. Rolling stands, used in the rolling mill, are grouped in the following groups:
- Squeezing group – 4 stands, vertical and horizontal stands standing in turn, with rolls’ diameter 640 mm – mах., 580 mm - min, barrel length 1000 mm, rolling speed up to 1 m/s in the 4th stand;
- Roughing group - 6 stands – all of them - horizontal:
- 4 stands DUO 560x1000 mm, rolls diameter from 520 mm to 560 mm, barrel length 1000 mm;
- 2 stands DUO 400x800 mm, rolls diameter from 380 mm to 435 mm, barrel length 800 mm;
- Intermediate group - 6 stands DUO 400x800 mm, rolls diameter from 380 mm to 435 mm, barrel length 800 mm;
- Finishing groups (left and right strands, similar) – each consisting of:
- Vertical stand DUO 400x630 mm, rolls diameter from 370 mm to 410 mm;
- Horizontal stand DUO 400x800 mm, rolls diameter from 380 mm to 435 mm;
- Vertical stands DUO 320x500 mm - 3 pieces, rolls diameter from 290 mm to 320 mm, barrel length 500 mm;
- Horizontal stands DUO 320x500 mm - 3 pieces, rolls diameter from 290 mm to 330 mm.
Vertical and horizontal stands are located in turn. Rolling speed in the finishing train is max 17 m/s. In the squeezing an roughing rolling groups there are used rolls made of modified cast iron, in the intermediate and finishing groups – rolls with chilled iron layer. While rolling reinforcing steel bars № 8-12 in a part of finishing group banded rolls are also used (with bands of hard alloy). Bearings in all stands are – PZhT.
Depending on size, rolling is performed through different number of rolling stands, in the blank spaces where stands are not used, gutters are installed.
In the squeezing group rolling is performed in one strand after which arrow directs the roll to the left and right strands of the roughing train.
In the roughing and intermediate groups rolling is performed in two strands, in the finishing group – in one strand. While rolling reinforcing steel bars №№8, 10 and 12 technology of two-strand slitting by rolling is used, where the roll is split lengthwise by the rolls in the stand with a special caliber into two strands, and in the subsequent stands rolling in the given finishing group is performed in 2 strands.
The roll is cut into cooling length by flying shears, located behind the last stand of the finishing group and is transported to the cooling bed by live rolls.
Length of each cooling bed is 106 m. The cooling bed is equipped with electric mechanical drive, a device for leveling of the fore side of the bar and a pneumatic device for sorting separate lots.
Packing section includes straightening machine for steel shapes and sections, cutting machine for steel and a device for fastening bars into a rounded bundle with maximum diameter of 500 mm and into square bundles for steel shapes and sections with size 500x500 mm and weight up to 4 tons.
Finished products warehouse
In the finished products warehouse there are boxes for the finished goods and separately standing machines for processing of irregular rolled stock. The warehouse is equipped with 11 bridge cranes.
The warehouse allows storing up to 80 thousand tons of rolled stock, and to perform dispatches by automobile and railway transport.
The Rolling Mill 300 also comprises a section of preparation of rolling equipment, which performs preparation of rolling stands and roller stands fittings for rolling.
Cut and bend shop
Comprises straightening machines, machines for bending, cutting of deformed and plain round barsfor production of reinforcement details used in construction. In April 2011 there was introduced an automated straightening and cutting complex. This investment allowed increasing capacity of the cut and bend shop up to 15 thousand tons per year.
Central Mill’s Laboratory
The laboratory is equipped with up-to-date technical instruments and means for performance of different tests and analysis, as well as with equipment for preparing samples for the tests.
In February 2011 the laboratory was equipped with a new universal tensile machine for testing finished goods, which allowed to increase the range of tested products and to increase preciseness and reliability of the tests.