140 



Copper and Copper-base Alloys 



TABLE 3 

 PEN METAL 



General Data — Strip" 

 Copper, 83.32%; tin, 1.32%; lead, 0.03%; iron, trace; zinc, balance 



Property 



Tensile strength, p.s.i. (000 omitted) 



Elongation, % in 2 in 



Apparent elastic limit, p.s.i. (000 omitted) 



Yield strength, 0.5% extension, p.s.i. (000 omitted). 



Yield strength, 0.2% offset, p.s.i. (000 omitted) 



Yield strength, 0.1% offset, p.s.i. (000 omitted) 



Rockwell hardness F, Jf g-in. ball, 60-kg. load 



Rockwell hardness B, Ke-in. ball, 100-kg. load 



Rockwell hardness G, J^e-™. ball, 150-kg. load 



Rockwell hardness 15-T, He-in- ball, 15-kg. load. . . 

 Rockwell hardness 30-T, Ke-in. ball, 30-kg. load. . 



Soft<= 



« All tests conducted on 0.040-in. stock. 



'' 6 B. & S. Nos., hard, 0.080-0.015 mm. grain size at ready-to-finish, respectively. 



" Annealed at 1300°F. for 1 hr. 



1 1.0 20.7 29.4 372 44.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area b\/ Rolling 

 01 23456 789 10 

 JB ^ S Numbers Hard 



Chakt 21. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of pen-metal strip, previously annealed to two 

 different grain sizea, 0.015 and 0.080 mm. (83.32 % copper, 1.32 % tin, 

 balance zinc (0.040-iu. stock) . 



< 



■^ 11.0 20.7 29.4 372 44.0 50.0 55.5 60.5 64.8 68.6 



Percent Reduction of Area by Rolling 

 01 23456789 TO 

 B S( S Numbers Hard 



Chakt 22. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 inches of pen-metal strip, previously 

 annealed to two different grain sizes, 0.015 and 0.080 mm. (83.32 % 

 copper, 1.32 % tin, balance zinc) (0.040-in. stock). 



