Translations:Steel making/191/en
From Vintage Story Wiki
Damaged refractory brick blocks have to be broken and replaced. When you break them, they return some of their materials back, similar to a broken bloomery. Check carefully every block (some might be hidden under other blocks). If some damaged blocks remain, you will not be able to start another carburation process. Grate blocks do not get damaged at the moment, which means there is no sense in making them out of higher tier bricks. In addition, not all of the blocks on the cementation furnace building need to be of the same tier, allowing for use of refractory blocks of a different tier when replacing damaged ones.