# Alloy smelting - Stage 4 (technology)

internal name `alloys-mk04` · tier 7 (Production science pack, [tier 7](https://factorio.kalzumeus.com/tier/7.md))
HTML page: https://factorio.kalzumeus.com/tech/alloys-mk04/

## Cost

1200 units of (1 × [Production science pack](https://factorio.kalzumeus.com/item/production-science-pack.md), 2 × [pY science pack 3](https://factorio.kalzumeus.com/item/py-science-pack-3.md), 3 × [Chemical science pack](https://factorio.kalzumeus.com/item/chemical-science-pack.md), 6 × [pY science pack 2](https://factorio.kalzumeus.com/item/py-science-pack-2.md), 10 × [Logistic science pack](https://factorio.kalzumeus.com/item/logistic-science-pack.md), 20 × [pY science pack 1](https://factorio.kalzumeus.com/item/py-science-pack-1.md), 30 × [Automation science pack](https://factorio.kalzumeus.com/item/automation-science-pack.md), 6 × [Military science pack](https://factorio.kalzumeus.com/item/military-science-pack.md)), 300 s each.

## Requires (2)

- [Erbium Processing](https://factorio.kalzumeus.com/tech/erbium.md)
- [Production science pack](https://factorio.kalzumeus.com/tech/production-science-pack.md)

## Leads to (4)

- [Advanced Robotics](https://factorio.kalzumeus.com/tech/advanced-robotics.md)
- [Biotechnology machines - Stage 3](https://factorio.kalzumeus.com/tech/biotech-machines-mk03.md)
- [Botany - Stage 3](https://factorio.kalzumeus.com/tech/botany-mk03.md)
- [Smelters - Stage 3](https://factorio.kalzumeus.com/tech/smelters-mk03.md)

## Unlocks (3 recipes)

### Erbium Nickel Cobalt Special Alloy (`ernico`)

- 10 s · tier 7
- Ingredients: 1 × [Erbium](https://factorio.kalzumeus.com/item/erbium.md), 10 × [Nickel plate](https://factorio.kalzumeus.com/item/nickel-plate.md), 100 × [Hot air](https://factorio.kalzumeus.com/fluid/hot-air.md), 2 × [Clean cobalt sulfate](https://factorio.kalzumeus.com/item/cobalt-sulfate-02.md)
- Results: 1 × [Erbium Nickel Cobalt Special Alloy](https://factorio.kalzumeus.com/item/ernico.md)
- Made in: Smelter MK 01, Smelter MK 02, Smelter MK 03, Smelter MK 04
- Unlocked by: [Alloy smelting - Stage 4](https://factorio.kalzumeus.com/tech/alloys-mk04.md)

### Heavy fermion material (`heavy-fermion`)

- 12 s · tier 7 · productivity modules allowed
- Ingredients: 10 × [Copper plate](https://factorio.kalzumeus.com/item/copper-plate.md), 5 × [Rare earth oxides](https://factorio.kalzumeus.com/item/reo.md), 10 × [Uranium 238](https://factorio.kalzumeus.com/item/u-238.md), 2 × [Fuel rod MK 01](https://factorio.kalzumeus.com/item/fuelrod-mk01.md), 4 × [Sand casting](https://factorio.kalzumeus.com/item/sand-casting.md), 5 × [Gold plate](https://factorio.kalzumeus.com/item/gold-plate.md)
- Results: 1 × [Heavy fermion material](https://factorio.kalzumeus.com/item/heavy-fermion.md)
- Made in: Advanced foundry MK 01, Advanced foundry MK 02, Advanced foundry MK 03, Advanced foundry MK 04
- Unlocked by: [Alloy smelting - Stage 4](https://factorio.kalzumeus.com/tech/alloys-mk04.md)

### Niobium titanium alloy (`nbti-alloy-2`)

- 4 s · tier 7
- Ingredients: 100 × [Molten titanium](https://factorio.kalzumeus.com/fluid/molten-titanium.md), 40 × [Niobium complex](https://factorio.kalzumeus.com/fluid/niobium-complex.md), 4 × [Sand casting](https://factorio.kalzumeus.com/item/sand-casting.md)
- Results: 15 × [Niobium titanium alloy](https://factorio.kalzumeus.com/item/nbti-alloy.md)
- Made in: Smelter MK 01, Smelter MK 02, Smelter MK 03, Smelter MK 04
- Unlocked by: [Alloy smelting - Stage 4](https://factorio.kalzumeus.com/tech/alloys-mk04.md)