160 



Copper and Copper-base Alloys 



no 



m 100 



:iN 



o 30 



X. 



=^ 20 





CR 400 500 600 700 800 900 1000 1100 1200 1500 

 Annealing Temp, in Deg. F flHr. at Temp.) 



Chart 82. — The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of hard-naval-brass 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. (61.50 % copper, 0.75 % tin, 

 balance zinc (0.040-in. stock). 



100 



90 



80 



. 70 



b; 60 



S.50 



-■ 40 

 o 



o 



°- 30 

 20 



10 







400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp. in Deg.F (IHr. a+ Temp.) 



Chakt 83. — The effect of annealing on the yield strength of hard- 

 naval-brass strip, previously cold-rolled 6 B. & S. Nos. (50 per cent 

 reduction of area) from a grain size of 0.015 mm. (61.50 % copper, 

 0.75% tin, balance zinc) (0.040-in. stock). 



90 

 80 



. 70 



C 



d- 60 



^50 



5 40 

 o 

 o 

 o_ 30 



20 

 10 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.I^( 1 Hn a+ Temp.) 



Chart 84. — The effect of annealing on the yield strength of hard-naval-brass strip, previously cold-rolled 6 B. & S. Nos. (50 per cent reduction 

 of area) from a grain size of 0.080 mm. (61.50 % copper, 0.75 % tin, balance zinc) (0.040-in. stock). 



