The authors studied on making of black heart malleable cast iron. The outline of the experiment is as follows :-
1) Casting of white cast iron and its graphitization velocity.
2) Relation of chemical compositions and annealing conditions.
3) Mechanical properties by quick annealing.
4) Micro structure on various stages of heating.
5) Determination of ideal chemical compositions and treating for making of quick annealing black heart malleable cast iron.
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