A furnace doesn't just output cold usable results. You need to wait for them to cool down.
Mods introducing new content into the game.
Version: 1.1.1 Date: 21.12.2024 Bug Fixes: - Fixed labels for hot pipe and underground pipe items and recipes (https://mods.factorio.com/mod/hot-metals/discussion/67493d0742705fa9914f61ca) - Fixed technology triggers being replaced for items that have non-hot early game recipes (https://mods.factorio.com/mod/hot-metals/discussion/676668fb9ce172be6c25f87a)
Version: 1.1.0 Date: 03.12.2024 Changes: - Added support for Vanilla (you still need to purchase Space Age) - Added support for AAI Industry - Added modding support - Removed Low density structure from the list because of https://forums.factorio.com/viewtopic.php?f=7&t=123081 Bug Fixes: - Fixed research triggers that use metals with hot variants - Fixed missing recipe names - Fixed Holmium