From Taconite to a Rolled Coil – The Spectacular Drama That is Steel Coil Making

14 March 18

Few fire blasts and sparks are more spectacular and eyepopping than the drama that is steel coil making.

From start to finish—from taconite to a rolled coil—the whole story of steel coil production is simply fascinating.

And today, we are here to take you on a visit to our steel making facility at Sinowell Metal, so that you can witness for yourself the never-ageing wonder of the tale that we all are so fondly part of.

It all starts with a blast!


And the earth’s core is shaken to the bottom, tossing off the steel-making raw materials towards the surface.

The raw material is taconite (which exists in the form of rock), and inside the rock is our prize – the crude iron ore.

Then starts the grinding process

The surfaced taconite is collected and brought to our facility, where we grind it hard to turn the rocks into pellets. This exposes the hidden iron ore, which then…

Yes, you guessed it correctly…is separated from the bulk with the help of huge magnets.
Zip, zap!

We then heat the ore

Now that we have separated the iron ore, we then heat it in blast furnace. The temperature of the blast furnace is maintained at 2700 degree Fahrenheit. Limestone is added to remove impurities.

Exposed to such extreme temperature, iron ore pellets convert into molten form.

At frequent intervals, molten iron is then beaten and tapped into giant containers. These containers are like submarines in shape, mounted onto a rail track which leads into the oxygen shop.

At the oxygen shop

Here, we let the molten iron breath some fresh air.

The molten iron is poured into oxygen furnace, and along with it we also dump steel scrap. Highly purified oxygen is then blown into the mix, and the molten iron becomes molten steel.

From Oxygen Furnace to Vacuum Degasser

Molten steel is then served to a vacuum degasser, where it passes through a fast sequence of steps, making it highly formable. Finally, it’s allowed to cool, before being taken to a caster where it’s molded into slab-like shape.

The steel slabs are then stockpiled, and await further processing.

Into the Hot Strip Mill

The stacked steel slabs are then brought to hot strip mill, where they get reheated, descaled and roughed on roughing stands. This makes the slabs thinner and longer. The roughed slabs are then further passed through a series of finishing stands, from where they come out even thinner.

The ultra-thin steel sheets are then cooled and rolled into coils, taking form of hot rolled steel coils.

Depending on the customer’s requirements, hot-rolled steel coils may be shipped as they are, or they can be further processed to cold rolled steel coils.

From Hot to Cold

Where further processing is required, the hot rolled steel coils are bathed in acid and washed, brushed and dried before being cold-rolled into cold rolled steel coils.

Lighter, stronger, durable and thinner – a far cry from the chunky taconite rocks. This is the story of steel coil making and we hope you enjoyed it!

If you have any questions about hot rolled or cold rolled steel coil, or interested in purchasing one, feel free to reach out.

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