Physical Properties of Iron and Hafnium
Melting Point
1,535.00 °C
  
25
2,150.00 °C
  
10
Boiling Point
2,750.00 °C
  
37
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Gray
  
Gray
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Brinell Hardness
1,450.00 MPa
  
6
Vickers Hardness
1,520.00 MPa
  
5
Speed of Sound
5,120.00 m/s
  
8
3,010.00 m/s
  
27
Optical Properties
  
  
Reflectivity
Not Available
  
Allotropes
Yes
  
No
  
α Allotropes
Ferrite (alpha Iron)
  
Not Available
  
β Allotropes
beta Iron
  
Not Available
  
γ Allotropes
gamma Iron
  
Not Available