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[Slackratchet]

I've got Iron, Charcoal, and a Magma furnace but no option for making Pig Iron. It worked once so I have some Pig Iron in sock but there is also no option for making Steel. I have no idea why.

[SenorPiquante]

To make steel, your dwarves mix pig iron with either charcoal or coke. To make the pig iron, they mix ordinary iron and bacon flux stone. There's a list of what stones are and aren't flux on the wiki, the only one I can remember off the top of my head is marble.

[JmzLost]

Pig Iron also requires flux.  The stones you are looking for are limestone, dolomite, chalk, calcite, and marble.  The first 3 are sedimentary layer rocks, and will be layers near the surface.  Calcite is found in small clusters in limestone and marble.  Marble is a metamorphic layer stone, and will usually be quite deep.  I tend to find marble at or below the 2nd cavern layer.  You can also order a little flux from the Dwarven caravan, but even a max request will only bring 4 of each stone, and they might not have some (or any) types of flux.

JMZ

[Mimir]

If a burrow overlaps your smelter the furnace operator will not consider materials outside the burrow.

Mimir.

[Slackratchet]

I totally forgot about Flux, I've run out! Arg! Thanks for the reminder JMZ.