I use the following setup for Forge: https://imgur.com/a/mSmtsAu
However, even if fed with Bituminous Coal and pushed Bellows constantly, the maximum temperature does not go past White, so I can't melt alloys in Vessel using Forge:

TFC Version: 1.7.3.161
I have some other TFC addons installed, which do not affect forge & metals (Aged Drinks, Ambiental, Dynamic Trees)

Coal burns at 1415 C, with bellows that's 2015 C, well above brilliant white. Cannot reproduce at all.

Ow. Owie. Ouch.

I placed bellows in wrong direction: the hole must face the forge. I didn't notice that hole.

TNG wiki has no information about hole direction, however, 1.7.10 wiki mentions that. Wiki limits registration for my IP, so add it please.