During heat treatment of steel, the hardness of various structures in increasing order is [2003]
Martensite, fine pearlite, coarse pearlite, spherodite
Martensite, coarse pearlite, fine pearlite, spherodite
Spherodite, coarse pearlite, fine pearlite, martensite
Fine pearlite, coarse pearlite, spherodite, martensite
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