Latest / Deep End Era. Engineering with Sankalp
Pulling the Oxygen Off: Steelmaking from Blast Furnace to Hydrogen
On a September afternoon a metallurgist watches the last cast from a blast furnace that has run for seventeen years. Episode one hundred and thirty nine explains what replaces it and why: how iron is pulled out of rust with carbon or hydrogen, how a blast furnace works and why coke is so hard to replace, how oxygen converters and electric arc furnaces turn iron and scrap into steel, and why Sweden's hydrogen steel projects show both the promise and the price of doing it differently. Then we go inside the metal, to the crystal switch that lets a few tenths of a per cent of carbon make the…
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