Engineering Materials
Carbon steel is

Refined from cast iron
An alloy of iron and carbon with varying quantities of phosphorus and sulphur
Made by adding carbon in steel
Extensively used for making cutting tools

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Engineering Materials
The unit cells

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

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