MATERIALS 



37 



EFFECT OF ALLOYS ON CAST IRON 



0.50 1.00 1.50 2.00 



Alloyi'ng Elemenfs-Per Cent 



2.50 



5.00 



Effect of alloys on tensile strength and Brinell hardness of an electrically melted 

 base iron containing 3.24 per cent total carbon, 0.67 per cent combined carbon, 2.57 

 per cent graphitic carbon, 0.71 per cent manganese, 1.88 per cent silicon, 0.17 per 

 cent phosphorus, 0.09 per cent sulphur ^^-ith an initial tensile strength of 39,000 lb. 

 per sq. in., and Brinell hardness of 217. {^American F oiindrymen^ s Associaticni.) 



