[weinzierl]

Decarbonising steel is a funny thing to say. Since steel is an alloy of iron and carbon it should mean turning steel into iron. Of course it is meant in a different way in the article.

[shirleyquirk]

That process is called /decarburization/

[perilunar]

yeah, but you turn pig iron and cast iron into steel by removing carbon, not adding it.

[dermesser]

Yes, the confusing issue is that iron-in-your-house or as a building material generally has a higher carbon content than steel, making the latter more elastic and less brittle (generally).