382 CAST IRON. 



COMPOSITION OF CAST IRON OF VARIOUS GRADES. 



203. Tensile Strength of Cast Iron. This varies from 

 seven to 15 tons per square inch in. extreme cases, but 

 more usually from eight to 11 tons. 



In the following table are quoted tensile strengths of 

 cast iron given by different authorities : 



TENSILE STRENGTH OF CAST IRON. 



No. of Tests , Tensile 



from which the j Strength, 



averages have l Tons per 



been taken. square inch. 



Authority. 



[ From " Casting and Founding," Spretson. 



