Iron

Iron is a lustrous, silvery-soft metal. It is the most common element on Earth by mass, forming much of Earth’s outer and inner core.

Description of what it is like

Freshly polished iron is silvery-grey. It is heavy and very strong. It is magnetic and will quickly rust (red-brown) when exposed to moist air.

Origin and where to find it

• Environments: Found in many minerals (ores) in the Earth’s crust; also found in some meteorites.
• Signs: Reddish or yellowish soil (rust color); heavy, dark rocks that affect a compass needle.
• It is a natural element, but requires high heat to extract from ore.

Minimum processing required

• Smelting: Heating iron ore with charcoal or coke at very high temperatures.
• Bloomery/Blast Furnace: To separate the iron from the slag.
• Forging: Hammering the hot metal to remove impurities and shape it.

Tools needed to work on it

• High-temperature furnaces (capable of reaching 1200°C+).
• Bellows for air supply.
• Heavy anvils and hammers.
• Tongs for handling hot metal.

Common forms of use

• Wrought Iron: Tough, malleable iron with low carbon content.
• Cast Iron: Hard, brittle iron with high carbon content.
• Steel: Iron alloyed with a small amount of carbon for superior strength.

Possible substitutes

• Bronze: Used before the technology to smelt iron was developed.
• Steel: The modern and superior version of iron.
• Aluminium or Composites: For lightweight strength.

Limitations and common failures

• Corrosion: Iron rusts easily, which can lead to structural failure.
• Brittleness: Cast iron can shatter under impact.
• High Melting Point: Difficult to work with compared to copper or gold.

Risks and safety

• Extreme Heat: Risk of severe burns during smelting and forging.
• Heavy Loads: Physical injury from handling heavy ingots or tools.
• Sparks: Eye and skin protection is essential.

Related materials

• Steel: The most important alloy of iron.
• Charcoal: Essential for the traditional smelting of iron.
• Magnetite: A common and magnetic iron ore.

Related Knowledge

• Forging