Valdiserri nets out his half of the costs and the rest is a profit margin three times what it gets for raw steel sheet.

FORBES: Man of steel

Last year it produced 3 million tons (3.48 million tonnes) of cold- and hot-rolled sheet steel.

FORBES: Man of steel

Last year it produced 3 million tons of cold- and hot-rolled sheet steel.

FORBES: Man of steel

On average, according to World Steel Dynamics, a consultancy, the mini-mills use less than one-third of the labour that the integrated mills need to make a tonne of sheet steel.

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The cityscape today is a sheet of steel stalagmites, scored with the trails of highway lights curving around the rim of Lake Michigan.

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The rest of Rouge's capacity, about 750, 000 tons at the time, was sold as uncoated raw sheet to the steel industry's middlemen.

FORBES: Man of steel

The rest of Rouge's capacity, about 750, 000 tons at the time, was sold as uncoated raw sheet to the steel industry's middlemen -- service centers and processors.

FORBES: Man of steel

They were turning to low-cost tool shops in Japan, Korea and China for the dies they use to stamp sheet metal into sculptured steel parts for automobiles.

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The shop turns 850, 000 tons of steel per year into corrosion-resistant sheet for cars.

FORBES: Man of steel

At TWB Co. a single laser welds steel sheets of different properties into a single raw sheet that Cadillac can have stamped into a door panel without any of its own welds.

FORBES: Man of steel