Blast Furnace
| Blast Furnace | |
|---|---|
 | |
| Class | Workstation |
| Type | Workstation |
| Build Menu | Blacksmithing |
| Build Skill | None |
| Build Tools | Wooden Trowel |
| Health | 150 (+50 per skill level) |
| Recipes | 36 |
| Crafts | Blacksmithing, Glassmaking |
| Location | Built |
The Blast Furnace is the top furnace for smelting iron and steel and for melting glass. The game describes it as a furnace for smelting iron items or turning sand into glass.
It serves Blacksmithing first and Glassmaking second. It runs every recipe of the Primitive Furnace and the Smelting Furnace. On top of those it adds the steel recipes, which work only at the advanced furnace. That makes it the last furnace in the metalworking line and the only way to make fresh steel. A survivor usually starts at a Primitive Furnace, moves to a Smelting Furnace, and builds the Blast Furnace once steel is needed. It is built on site from stone blocks.
How to Build Blast Furnace
The build recipe is Construct Blast Furnace, found under Blacksmithing in the build menu. It takes forty Stone Block, one bag of concrete and a Large Bellows. A Mason's Trowel is needed as well, and it is kept after the build.
The recipe is known from the start. The Blacksmith occupation, the Blacksmith Knowledge trait and the Mason trait all start with it known.
The cost is the same as the Smelting Furnace plus the Large Bellows. The bellows is the part that turns a plain stone furnace into a blast furnace.
The finished furnace has 150 health. Every point of the builder's skill adds another 50, so a skilled builder leaves a much sturdier furnace.
The Construct Blast Furnace recipe is in the Blacksmithing build menu. It needs no skill level.
| Name | Image | Amount | Kept | Spawn ID |
|---|---|---|---|---|
| Wooden Trowel | 
|
1x | Yes | /additem Base.MasonsTrowel_Wood
|
| Stone Block | 
|
40x | No | /additem Base.StoneBlock
|
| Bucket of Concrete | 
|
1x | No | /additem Base.BucketConcreteFull
|
| Large Bellows | 
|
1x | No | /additem Base.LargeBellows
|
How to Use Blast Furnace
Every craft at the furnace takes its fuel as a recipe input. Most recipes burn charcoal, and any item that counts as charcoal works. The steel recipes that start from iron burn Coke and Limestone together instead of charcoal.
Hot metal is handled in ceramic crucibles. A Large Ceramic Crucible or a Small Ceramic Crucible holds the molten iron or steel. Tongs are needed for almost every recipe, and crude tongs work for most of them. Both the tongs and the empty crucible come back after a plain smelt.
Casting pours the filled crucibles into a mold. The bar mold or ingot mold is kept, so one mold serves many casts. The glass recipes also need a fire starter on top of the charcoal.
Placing the furnace close to the forge saves long walks with heavy metal.
Crafting Recipes
The basic iron work matches the lower furnaces. Extract Iron Bloom turns Iron Ore into an Iron Bloom over charcoal. Extract Iron from Iron Ore fills a Large Ceramic Crucible with Iron from ore or a bloom. Smelt Copper Ore gives Copper Scrap.
Scrap iron becomes Iron Chunk through Smelt Iron From Small Item, Smelt Iron From Medium Item and Smelt Iron From Large Item. Pieces such as Nails, Forged Fork or Iron Piece go through Extract Iron from Smaller Items. Crucibles full of iron are cast with Cast Iron Bar and Cast Iron Ingot.
Cast Blacksmith Anvil is the big iron job. It pours a large amount of molten iron into a Ceramic Blacksmith Anvil Mold to make the Blacksmith Anvil for a forge.
Steel is the reason to build this furnace. Smelt Steel From Small Iron Item and its larger versions turn iron scrap into Steel Chunk with Coke and Limestone. Cast Steel Bar from Iron and Cast Steel Ingot from Iron make steel straight from crucibles of iron. Old steel items melt down through Smelt Small Steel Item and Smelt Steel From Small Steel Item. Cast Steel Bar and Cast Steel Ingots then pour that steel into shape.
For glass, Melt Glass uses Broken Glass and Melt Sand uses a Sack of Sand. Both fill a Small Ceramic Crucible with Molten Glass.
Every recipe made at the Blast Furnace is listed with what it uses up, the tools it hands back and the skill it asks for. A "Yes" under Learned means the recipe has to be learned before it shows up. Each tab holds one crafting menu category.
| Name | Image | Recipe | Crafting Materials | Tools | Skill | Learned | Spawn ID |
|---|---|---|---|---|---|---|---|
| Blacksmith Anvil | 
|
Cast Blacksmith Anvil | Tongs | None | No | /additem Base.BlacksmithAnvil
| |
| Iron Bar | 
|
Cast Iron Bar |
|
None | No | /additem Base.IronBar
| |
| Iron Ingot | 
|
Cast Iron Ingot |
|
None | No | /additem Base.IronIngot
| |
| Steel Bar | 
|
Cast Steel Bar |
|
None | No | /additem Base.SteelBar
| |
| Steel Bar |
|
Cast Steel Bar from Iron | None | No | /additem Base.SteelBar
| ||
| Steel Ingot | 
|
Cast Steel Ingot from Iron | None | No | /additem Base.SteelIngot
| ||
| Steel Ingot |
|
Cast Steel Ingots |
|
None | No | /additem Base.SteelIngot
| |
| Iron Bloom | 
|
Extract Iron Bloom | - | None | No | /additem Base.IronBloom
| |
| Large Ceramic Crucible with Iron | 
|
Extract Iron from Iron Ore | Kitchen Tongs | None | No | /additem Base.CeramicCrucible_Iron
| |
| Iron Chunk | 
|
Extract Iron from Smaller Items |
|
None | No | /additem Base.IronChunk
| |
| Steel Chunk | 
|
Extract Steel from Smaller Iron Items |
|
None | No | /additem Base.SteelChunk
| |
| 10x Copper Scrap | 
|
Smelt Copper Ore |
|
- | None | No | /additem Base.CopperScrap
|
| 4x Iron Chunk |
|
Smelt Iron From Large Item | None | No | /additem Base.IronChunk
| ||
| 2x Iron Chunk |
|
Smelt Iron From Medium Item | None | No | /additem Base.IronChunk
| ||
| 3x Iron Chunk |
|
Smelt Iron From Medium Plus Item | None | No | /additem Base.IronChunk
| ||
| Iron Chunk |
|
Smelt Iron From Small Item | None | No | /additem Base.IronChunk
| ||
| Small Ceramic Crucible with Iron |
|
Smelt Large Iron Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Iron
|
| Small Ceramic Crucible with Steel | 
|
Smelt Large Steel Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Steel
|
| Small Ceramic Crucible with Iron |
|
Smelt Medium Iron Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Iron
|
| Small Ceramic Crucible with Iron |
|
Smelt Medium Plus Iron Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Iron
|
| Small Ceramic Crucible with Steel |
|
Smelt Medium Plus Steel Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Steel
|
| Small Ceramic Crucible with Steel |
|
Smelt Medium Steel Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Steel
|
| Small Ceramic Crucible with Iron |
|
Smelt Small Iron Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Iron
|
| Small Ceramic Crucible with Steel |
|
Smelt Small Steel Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Steel
|
| Small Ceramic Crucible with Iron |
|
Smelt Smaller Iron Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Iron
|
| Small Ceramic Crucible with Steel |
|
Smelt Smaller Steel Item |
|
Kitchen Tongs | None | No | /additem Base.CeramicCrucibleSmall_Steel
|
| 4x Steel Chunk |
|
Smelt Steel From Large Iron Item | None | No | /additem Base.SteelChunk
| ||
| 4x Steel Chunk |
|
Smelt Steel From Large Steel Item | None | No | /additem Base.SteelChunk
| ||
| 2x Steel Chunk |
|
Smelt Steel From Medium Iron Item | None | No | /additem Base.SteelChunk
| ||
| 3x Steel Chunk |
|
Smelt Steel From Medium Plus Iron Item | None | No | /additem Base.SteelChunk
| ||
| 3x Steel Chunk |
|
Smelt Steel From Medium Plus Steel Item | None | No | /additem Base.SteelChunk
| ||
| 2x Steel Chunk |
|
Smelt Steel From Medium Steel Item | None | No | /additem Base.SteelChunk
| ||
| Steel Chunk |
|
Smelt Steel From Small Iron Item | None | No | /additem Base.SteelChunk
| ||
| Steel Chunk |
|
Smelt Steel From Small Steel Item | None | No | /additem Base.SteelChunk
|
| Name | Image | Recipe | Crafting Materials | Tools | Skill | Learned | Spawn ID |
|---|---|---|---|---|---|---|---|
| Small Ceramic Crucible with Molten Glass | 
|
Melt Glass | Kitchen Tongs | None | No | /additem Base.CeramicCrucibleWithGlass
| |
| Small Ceramic Crucible with Molten Glass |
|
Melt Sand | Kitchen Tongs | None | No | /additem Base.CeramicCrucibleWithGlass
|
Station Tiers
The Primitive Furnace runs only the simplest iron and copper smelting. The Smelting Furnace adds crucible casting, the anvil and glass. The Blast Furnace runs all of that and every steel recipe on top.
Keep working at the Smelting Furnace while only iron and glass are needed. Move up once steel bars, steel ingots or steel chunks are wanted. The upgrade costs one Large Bellows more than the Smelting Furnace.
The Blast Furnace shares its recipes with the stations below. A higher station runs everything a lower one runs.
| Name | Image | Recipes | Build Skill | Compared |
|---|---|---|---|---|
| Blast Furnace | 
|
36 | None | This station |
| Primitive Furnace | 
|
7 | None | Runs part of these recipes |
| Smelting Furnace | 
|
19 | None | Runs part of these recipes |
Notes
- The build tooltip reads: a blast furnace for smelting iron items or turning sand into glass.
- It is the only furnace that makes steel, and Coke and Limestone drive the iron to steel recipes.
- Tongs and empty crucibles come back after smelting, so a single set lasts a long time.
- Molds for bars and ingots are kept, so cast in batches.
- Build it near the forge to keep heavy metal close.
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