142 



Copper and Copper-base Alloys 



CR 400 500 600 700 800 900 1000 1100 1200 1300 

 Anneoiling Temp, in Deg.E (1 Hr. a+ Temp.) 

 Chart 27. — The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of pen-metal strip, previously cold-rolled 

 6 B. & S. Nos. (50 per cent reduction of area) from two different grain 

 sizes, 0.015 and 0.080 mm. (83.32 % copper, 1.32 % tin, balance zinc) 

 (0.040-in. stock). 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp in Deg.F (1 Hr. at Temp.) 



Chart 28. — The effect of annealing on the yield strength of pen- 

 metal strip, previously cold-roUed 6 B. & S. Nos. (50 per cent reduction 

 of area) from a grain size of 0.015 mm. (83.32 % copper, 1.32 % tin, 

 balance zinc) (0.040-in. stock). 



90 

 80 

 70 



c 60 



& 

 '^ 50 



s- 



Q) 



^40 



JD 



o30 

 o 



2-20 

 10 







400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. F. (1 Hr. af Temp.) 



-The effect of anneaUng on the yield strength of pen-metal strip, previously cold-rolled 6 B. & S. Nos. (50 per cent reduction of area; 

 from a grain size of 0.080 mm. (83.32 % copper, 1.32 % tin, balance zinc) (0.040-in. stock). 



