But I was not able to resolve it from the suggestions I received. So, I'm posting this here to reach more of an audience.
Copy-paste of the reddit text post below:
Hello, I recently setup a new Forge 1.10.2 server for a friend and I, with only a few mods, including Tinkers Construct and Mekanism.
However, I've encountered a problem: Tinkers does not seem to work with steel. From what I can read, Tinkers should add its own steel, that you obtain by putting chainmail in the smeltery, but this does not work. If I search JEI for "steel ingot", only the mekanism variant turns up. If I put mekanism steel dust into the smeltery, it does not smelt. Steel is also missing from the Tinkers "Materials and You" book from Tinkers.
I haven't been able to find any steel-related settings in the Tinkers config files, I haven't found any changelogs for Tinkers mentioning changes to steel, and I haven't found any issues in Tinkers' Issue Tracker mentioning steel either.
Does anyone know why I can't use steel with Tinkers?
MC Forge Version: 188.8.131.525
Tinkers Version: 2.6.3
Mekanism Version: 184.108.40.2068
Other Mods Used: Biomes O Plenty, Doomlike Dungeons, Iron Chests, Minecolonies, Roguelike Dungeons