134 



Copper and Copper-base Alloys 



TABLE 1 

 BEARING OR WEATHERSTRIP BRONZE 



General Data — Strip" 

 Copper, 90.49%; tin, 0.48%; iron, trace; zinc, balance 



Property 



Hard" 



Soft' 



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, Ji e-in- ball, 60-kg. load 



Rockwell hardness B, Jf e-in. ball, 100-kg. load 



Rockwell hardness G, He-in- ball, 150-kg.' load 



Rockwell hardness 15-T, Jie-iii- ball, 15-kg. load 



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



Young's modulus of elasticity, p.s.i 



* All tests conducted on 0.040-in. stock. 



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



' Annealed at 1300°F. for 1 hr. 



no 



100 



90 



.80 



c 



0-70 



Q. 



-gso 



o 



o40 



o 



30 

 20 

 10 







11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 012 345 6789 10 

 BSS Numbers Hard 



Chaht 1. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of bearing or weatherstrip bronze strip, previ- 

 ously annealed to two different grain sizes, 0.015 and 0.080 mm. 

 (90.49 % copper, 0.48 % tin, balance zinc) (0.040-in. stock). 



CD 100 



8 90 



I 



o 

 Z 70 



5 60 



^ 50 



w 40 



30 



= 20 



^ 



II.O 20.7 29.4 372 44.0 5Q0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 0123456789 10 

 B &■ S Numbers Hard 

 Ch-yht 2. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of bearing or weatherstrip bronze strip, 

 previously annealed to two different grain sizes, 0.015 and 0.080 mm. 

 (90.49 % copper, 0.48 % tin, balance zinc) (0.040-in. stock). 



