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The influence of varied weight percent of inoculant (ferrosilicon) on  the microstructure and hardness property of hypo- eutectic grey cast iron was investigated. Four sets of chill wedge samples were produced using  two chill wedge wooden patterns (W3  1/2 and W4). The first set, the control samples W3  1/2 and W4  were uninoculated. The second, third and fourth sets  were  inoculated with 1.0wt.%, 1.5wt.% and 2wt.% ferrosilicon respectively to give inoculated samples W3  1/2 and W4. Wedge test was conducted on the samples at  the four  different points (1, 2, 3 and 4) in accordance with ASTM A367.  From the results,  microstructures of the  control and the inoculated samples were differently influenced by the  varied percentage of the inoculant at  the four  designated points 1, 2, 3 and 4. The average hardness property of the  inoculated   samples  decreases   with  increasing  ferrosilicon addition. Samples W3  1/2 and W4  with  1.0wt.% ferrosilicon  revealed high  hardness property  at chill zone, and hardness property of W3 1/2 was high  relative to sample W4   with the values of  34.9 HRA  and 30.6 HRA respectively. Similarly, the control samples   showed the highest hardness property  at the chill zone.  Sample W3 1/2  revealed high hardness value  of 33.0 HRA  relative to  sample W4  of 26.8 HRA at the chill zone. Keywords - inoculant; Microstructure; hypo- eutectic;  chill zone;  hardness property

Chilling Effect of Inoculation on the Microstructure and Hardness Property of Hypo-Eutectic Grey Cast Iron