182 



Copper and Copper-base Alloys 



TABLE 3 

 SILICON BRASS NO. 2 



General Data — Strip" 

 Copper, 72.36%; silicon, 0.47%; 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, Jie-in- ball, 60-kg. load 



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



Rockwell hardness G, Jie-in- ball, 150-kg. load 



Rockwell hardness 15-T, Jf g-in. ball, 15-kg. load 



Rockwell hardness 30-T, )^Q-m. ball, 30-kg. load 



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



Density, lb. per cu. in 



Melting point, °F 



" AH tests conducted on 0.040-m. stock. 



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



« Annealed at 1300°r. for 1 hr. 



11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduc+ion of Area by Rolling 

 01 2 345678"? 10 

 B 5-S Numbers Hard 

 Chart 16, — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of giUcon-brass No. 2 strip, previously annealed 

 to two different grain sizes, 0.015 and 0.080 ram. (72.36 % copper, 

 0.47 % silicon, balance zinc) (0.040-in. stock). 



o-no 



o 



2 100 



CO 



"S 90 



70 



=K 60 



-^50 



40 



30 



=^20 



i^ 10 



o 

 ^ 



11.0 20.7 27.4 372 44.0 5Q0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 01 2 3456 789 10 

 BSS Numbers Hard 



CHvi.RT 17. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of silicon-brass No. 2 strip, previously 

 annealed to two different grain sizes, 0.015 and 0.080 mm. (72.36 % 

 copper, 0.47 % silicon, balance zinc) (0.040-in. stock). 



