Steeltech Alloys PVT LTD

"Steeltech Alloys Pvt Ltd" is a melting shop with an installed capacity of 40,000 mt per annum. The route of steel making is through induction furnace melting with refining through Vaccum Degassing {vd).

Company is producing high quality Steel Ingots in Steel Melting Shop. The prime raw materials used are Sponge Iron, Pig Iron and MS scrap, out of which majority is the Sponge Iron being sourced from the Sponge Iron Kilns of the company. This not only ensures availability of quality sponge iron for the steel operations but also results in cost effective operations.

In the steel smelting process, unwanted gases are dissolved in the liquid, which could produce any number of imperfections and defects. A common method used to remove these undesired gases is vacuum degassing. The process is done after the molten steel has left the furnace and before being poured into ingots or introduced into a continuous caster.

About three decades back, induction furnaces were used only in the foundry industry. During mid-80’s induction furnaces were introduced for steel making. Gradually, induction furnaces of larger capacities were introduced successfully from 3T to 50T over a period of three decades. Many efforts have been put into effect to make the steel making efficient through induction furnace route. The main raw materials for induction furnaces are steel scrap, sponge iron and cast iron. India is one of the countries where use of sponge iron contributes a large share in annual crude steel production. The amount of sponge iron in the charge mix varies from 0-90% depending on its availability and economics of production. Majority of the steel produced through induction furnace route is plain carbon steel and construction quality steel. The main limitation in maintaining quality of construction steel is controlling the quantum of phosphorus in steel produced through induction furnace route especially if sponge iron is used. In this route, the steel retain phosphorous in the range of 0.045% to as high as 0.09% depending on the quality of raw materials. The main source of phosphorous in induction furnace is sponge iron and cast iron, the quality of which is directly related to quality of iron ore. Ladle metallurgy is very important technology when it comes to refining of steel and trimming of final chemistry.

During the steelmaking process, while the molten steel is still in the ladle and before it is poured, the steel must be degassed in order to:
(1) reduce/eliminate dissolved gases, especially hydrogen and nitrogen;
(2) reduce dissolved carbon (to improve ductility); and
(3) to promote preferential oxidation of dissolved carbon (over chromium) when refining stainless steel grades.