During heat treatment of steel, the hardness of various structures in increasing order is 

1
martensite, fine pearlite, coarse pearlite, spherodite
2
fine pearlite, coarse pearlite, spherodite, martensite
3
martensite, coarse pearlite, fine pearlite, spherodite
4
spherodite, coarse pearlite, fine pearlite, martensite

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