Melting process (from scrap to liquid steel)
To make one heat, approx. 95 tonnes of scrap steel is charged into the steel furnace. The melting process, which turns the scrap into high quality liquid steel, takes 35-40 minutes. During the melting process, it is necessary to start to remove impurities which could damage the steels final characteristics. This is done by creation and removal of slag.
When properly melted, the liquid steel holds the temperature of approx. 1650 degree (C).Main ingredients for making the steel
After the melting process, the next step is moving the liquid steel to the ladle furnace, where final refinement will take place. Dependant on required analysis, different ferro alloys are added to the liquid steel during this process.
At the ladle furnace, further efforts are made to get rid of impurities. This is done by allowing argon/nitrogen gas to be blown into the liquid steel. In the ladle furnace the temperature of the steel is regulated, and final adjustments of the analyses is done before pouring the steel into the continuous cast machine.
Casting process (from liquid steel to billets)
The liquid steel is poured from the ladle, through the tundish, and then runs into a continuous casting machine. This process shapes and cools the liquid steel into ?firm? strings of steel. The casting machine has 5 stands, and billet sizes from 115 to 160 mm. square can be made. The length can be made from 7 to 13 metres, making units up to 2,6 tonnes.