Fatigue and Corrosion-fatigue Properties of Wrought Copper and Copper-base Alloys 319 



TABLE 19 

 SILICON BRONZES 



"* Proportional limit 9,400 p.s.i.; modulus of elasticity 16.6 X 10^ p.s.i. 



^ Proportional limit 28,500 p.s.i.; modulus of elasticity 15.6 X 10^ p.s.i. 



*■ Proportional Umit 31,600 p.s.i.; modulus of elasticity 15.4 X 10^ p.s.i. 



*0.50% extension yield strenRth 64,200 p.s.i.; 0.20% offset yield strength 80,000 p. 



' 0.50 % extension yield strength 49,100 p. 



^ 0.50% extension yield strength 45,200 p. 



» 0.50 % extension yield strength 16,000 p, 



'^ 0,50 % extension yield strength 68,500 p.f 



; modulus of elasticity 14.63 X IQo p.f 



0.20% offset yield strength 14.500 p.s.i.; modulus of elasticity 16.94 X 10«. 



0.20 % offset yield strength 80,500 p.s.i.; modulus of elasticity 16.98 X 10" p.s.i. (Temper commercially furnished 



for use in the manufacture of bolts and screws by cold-\ipsetting or heading operations.) 



» Specimen taken from 2.50-in. extruded rod: axis of specimen 0.750 in. from surface of rod. 

 i Specimen taken from 2.50-in. extruded rod: axis of specimen 0.325 in. from rod surface. 

 *' Specimen taken from 2.50-in. hot-rolled rod: axis of specimen 0.750 in. from surface of rod. 

 ' Specimen taken from 2.50-in. hot-rolled rod: axis of specimen 0.325 in. from surface of rod. 



