Engineering Materials
The unit cells

All of these
Have the same orientation and their similar faces are parallel
May be defined as the smallest parallelepiped which could be transposed in three coordinate directions to build up the space lattice
Contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal

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Engineering Materials
Steel contains

50% or more iron
Elements like phosphorus, sulphur and silicon in varying quantities
Alloying elements like chromium, tungsten nickel and copper
80% or more iron

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