==Extensions==

{| class="wikitable"

! Extension

! Consumes

! Produces

! Building Tile Size

|-

| [[File:Steelworks_Protective_Atmosphere.png]]

| 1 Sand [[File:icon sand.png|16px]], 2 Coal [[File:icon coal.png|16px]], 4 Iron [[File:icon iron.png|16px]],

| 2 Steel [[File:icon steel.png|16px]]

| 2x2

|-

| [[File:Steelworks_Siemens-Martin_Furnace.png]]

| 1 Sand [[File:icon sand.png|16px]], 3 Coal [[File:icon coal.png|16px]], 6 Iron [[File:icon iron.png|16px]],

| 3 Steel [[File:icon steel.png|16px]]

| 3x2

|-

| [[File:Steelworks_Oxygen-Mazut_Furnace.png]]

| 1 Sand [[File:icon sand.png|16px]], 2 Diesel [[File:icon diesel.png|16px]], 6 Iron [[File:icon iron.png|16px]],

| 3 Steel [[File:icon steel.png|16px]]