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To make alloys, put the correct ratio of molten metals into a crafting table. You can put them in any shape/order.
Any Material Block
Blast Furnace (1m)
Molten Material
More advanced tutorial.
Steel
5 Molten Iron
1 Molten Diamond
4 Steel Blocks
Bronze
4 Molten Copper
1 Molten Iron
1 Molten Gold
4 Bronze Blocks
Carbon Fiber
1 Molten Diamond
3 Carbon Fiber
Emerald
4 Molten Amethyst
1 Molten Diamond
3 Emerald Blocks
Budding Amethyst
1 Molten Amethyst
1 Budding Amethyst
Lead
4 Molten Iron
2 Molten Gold
2 Lead Blocks