TABLE 47. 



MECHANICAL PROPERTIES. 

 TABLE 47. Alloy Steels Commercial Experimental Values. 



77 



GENERAL NOTE. Table on steels after Motor Transport Corps, Metallurgical Branch of Engineering Division, 

 Table No. 88. 



Maximum allowable P 0.045 or less, maximum allowable S 0.05 or less. 



Silicon contents were not determined by Motor Transport Corps in preparing table, except for silico-manganese steels. 

 Compressive strengths: 



For all steels approx. equal to yield point in tension (slightly above P-limit). 

 Density: 



Steel weighs about 7.85 g/cm 3 or 490 lb/ft 3 

 Ductility, Erichsen values: 



0.75 mm (0.029 in.) thick, low carbon soft annealed sheet (B. S.), depth of indentation 12.0 mm or 0.472 in. 

 1.30 mm (0.050 in.) thick, low carbon soft annealed sheet (B. S.), depth of indentation 12.5 mm or 0.492 in. 

 Modulus of elasticity in tension and compression: 



For all steels approx. 21,000 kg/mm 2 = 30,000,000 lb/in 2 . 

 Modulus of elasticity in shear: 



For all steels approx. 8400 kg/mm 2 = 12,000,000 lb/in 2 . 



Scleroscope hardness values shown are as determined with the Shore Universal hammer. 

 Strength in shear: 



P-Iimit and ultimate strength each about 70 per cent corresponding tensile values. 



SMITHSONIAN TABLES. 



