Smelting turns raw ore into the metal, sulfur and high-quality metal that builds and arms everything in Rust. This guide covers furnaces vs the large and electric furnace, how wood fuel and charcoal work, what you smelt, and how to refine low grade fuel.
Furnace types
- Furnace — the standard early smelter; cheap to craft, fine for small batches, and movable.
- Large Furnace — smelts far more ore at once, essential as your base scales, but it burns more wood and can’t be picked up once placed.
- Electric Furnace — a late-game option that runs on power instead of wood, ideal for an automated, fuel-free smelting setup.
Most players run several standard furnaces early, then graduate to a large furnace (or an electric one) as metal demand grows.
Fuel: wood and charcoal
Furnaces burn wood to generate the heat that smelts ore — and as a by-product they produce charcoal, which you’ll need for gunpowder. So a running furnace is also a charcoal factory. A common beginner mistake is over-fuelling: add only as much wood as the smelt needs, or you waste wood and the smelt finishes before the fuel does.
What you smelt
- Metal ore → Metal Fragments — the backbone of building, tools and weapons.
- Sulfur ore → Sulfur — the base of every explosive (see the sulfur & gunpowder guide).
- High Quality Metal ore → HQM — for top-tier gear, armoured building and workbenches. It’s rare and smelts slowly, so HQM is always the bottleneck.
Low grade fuel
Low grade fuel powers tools, lanterns and many machines and vehicles. It isn’t smelted in a furnace — it’s refined from crude oil at a Refinery. Crude comes from pump jacks, crude barrels at monuments, and oil from the seabed, so set up a refinery once you start running vehicles.
Get exact smelt amounts
Wood needed, smelt time and output all depend on how much ore you’re processing. Our free Rust Smelting Calculator gives exact fuel and time for any batch, so you don’t waste wood or stand around waiting.
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