Products & Services

Steel Ingots
Steel ingots are manufactured by the freezing of a molten liquid (known as the melt) in a mold through bottom-up pouring. The main raw-material for manufacture of M.S. ingots are Iron & Steel Scrap, Sponge Iron, Ferro Manganese & Ferro Silicon which are fed into the induction furnace in the ratio as per Product Specification. The finish product Ingot is used as Raw-material for Re-Rolling for manufacture of Bars &Rods.

Carbon steel cast billet ingot process detail:-
The preparation to charge  Cast Iron, Scrap and Sponge is done at 1250°C. Smoke of the molten disperses to air under pollution controlled environment and  the slag formed on the top layer is taken off from the metal. After that Ferro-alloys like ferro silicon and silico-maganese is added to the charged product. The charging temperature  in the furnace post the addition is controlled at1600 °C ± 20°C and then the molten is tapped and teemed in the mould by bottom-up pouring method. After sometime the mould is stripped off from the ingots and the ingots are carried to an open area. The laboratory activities are then done wherein, the Ingots are inspected  and metallurgical testing is carried out.. Finally, a batch no. is given and the MS Ingot is ready for dispatch to rolling section.
 

Re-Rolled Products
Meghalaya steels limited is the manufacturing franchise of KAMDHENU TMT Bars. The company has received the ISO 9001:2000 Certification Ltd.The company has granted the permission to mark ISI Certification on its products by BIS of the different Size and Grades as Fe-415, Fe-415D, Fe-500, and Fe-500D. Manufactured under the best quality control parameters these bars give high ductility, bendability and weldability and are fully equipped to resist earthquakes of high impact.

TMT bars are widely used in general purpose concrete reinforcement structures, bridges and flyovers, dams, thermal and hydel power plants, industrial structures, high-rise buildings, underground platforms in metro railways and rapid transport system etc.

The plant is automatic for hot-rolling and latest technology for the manufacture of  Kamdhenu TMT Bars. The Plant is based on upgraded automated German technology system. It is ably supported by well-equipped lab managed by qualified technicians to provide real time results as regards the raw materials and finished products. The Re-Rolling Mills Comprises of a Rolling Mill Unit along with twisting facilities and other balancing equipment and auxillary facilities.

The Process of rolling involves hot working on metals i.e. changing of the cross sections of feed material by way of passing it through pair of rolls at various stages for the materials to reach todesired shape and cross section. The whole operation is conducted within the temperature range and time
.

Hot Rolling & TMT Process:-
The processes involves heating of billets/ingots in a Re-heating furnace and rolling them then through a sequence of a rolling stand which progressively reduce the billets to the size and shape of bar.

After leaving the last stand of the rolling mill, the bars rolling temperature of about 950°C  and they are submitted a special heat treatment.

1. Quenching Stage
2. Tempering Stage
3. Cooling Stage

Quenching Stage:- 
The Quenching is partial, only until a surface layer has been transformed from austenite to marten site

Tempering Stage:- 
In this stage, this results in an automatic self-tempering process where the surface layer of marten site is tempered.

Cooling Stage:-
The third stage is “Atmospheric cooling” the austenite core is transformed to a ductile ferrite pearlite core.

The final structural consist of a combination of a strong out layer of tempered marten site and a ductile core of Ferrite-Pearlite. Strength of the bars are carefully controlled by optimizing the water pressure for their pearlite, core and tough surface of “Tempered Marten site”.

Ferro-Silicon
Ferrosilicon, or ferrosilicium, is a ferroalloy, an alloy of iron and silicon with between 15% and 90% silicon. It contains a high proportion of iron silicides. Its melting point is about 1200 °C to 1250 °C with a boiling point of 2355 °C. It also contains about 1% to 2% of calcium and aluminium.

Quartz, Charcoal & M.S.Scrap are mixed in ratio as per product specification and the mixture is charged in the Submerged Arc Furnace Sio2, FeO reats with Co2 at the temperature 1650 °C . After the reaction it takes place a mixture of Iron and Silicon trickles down and gets collected in the bottom of the furnace crucible. The impurities present inform of molten slag are collected in vessel.

After tapping and cooling the metal is cleaned by chipping and dressing. Cleaned metel is then broken in required sizes for packing and despatch. After dressing the metal is tested in laboratory to check the composition and quality.

Product Specification

Ferro Silicon 70-75% Grade
Carbon 0.10% Max
Sulphur 0.05% Max
Phosphorous 0.05% Max
Aluminium 1.25% Max
In sizes of 25-150mm lumps

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Flowchart

MG Ingot



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MS Rods

  
   


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Ferro-Silicon