Idling a Kurashiki blast furnace for a large electric arc furnace (2022)

What it means for heavy industry to face decarbonization

The core of this decision is that an ordinary capital replacement — spending tens of billions of yen to rebuild an ageing blast furnace — was converted into a down payment on decarbonization. Three million tonnes a year is only a slice of JFE’s roughly 47 million. But because it was the first time a major blast furnace had been stopped with carbon reduction stated as the front-line reason, the decision reached past a single furnace and became a signal for the whole industry about how many Japanese blast furnaces would remain. The judgement shows in the timing: an unavoidable fork, the reline date, was used as the moment to make a change that is hard to reverse.

Whether replacement by electric furnace is in fact the answer to decarbonization is still unsettled. Producing high-quality steel stably in an electric furnace, disposing of captured carbon dioxide, and the ultimate process of full hydrogen reduction are all far from established, and the Kurashiki conversion itself remained under study after the announcement. Rebuilding a heavy-industrial production base over decades is completed only when technology, cost and policy support mesh. Whether the 2022 move keeps its meaning as the starting point of that transition depends on the development still to come, and on how society decides to share the cost of decarbonization.