Fe(Atomic number : 26)

1. Introduce

– Softer than aluminum but stronger when mixed with small amounts of carbon

– Accounts for more than 90% of the world’s metal production

– Fe alloying element effect: increased strength

* Types of Fe

1) Pure Iron

– Pure iron

– Less than 0.035% carbon content

2) Wrought Iron

– Iron with less carbon added than steel

– Carbon content greater than 0.05%, but less than 0.25

3) Hardened steel

– Iron with some carbon added to pure iron to increase hardness

(1) Carbon steel: an alloy of iron and carbon, containing a small amount of silicon, manganese, phosphorus, sulfur, etc.

(2) Alloy steel: an alloy of iron and carbon, containing vanadium, molybdenum, cobalt, etc.

(3) Stainless steel: carbon content of 1.2% or less, chromium content of 10.5% or more

4) Cast iron (= pig iron)

– Iron with more carbon added than steel

– Carbon content exceeds 2.0

2. Property

– Strength, hardness, electrical conductivity, heat resistance, excellent machinability

[Fe Mechanical Properties]

[Fe Physical Properties]

3. Application

– Automobile bodies, building skeletons, ships, railroads, computer body cases, streetcars

(1) Automobile body / (2) Ship / (3) Railway / (4) Streetcar