154 



Copper and Copper-base Alloys 



900 1000 1100 1200 1300 



Annealing Temp, in Deg. F. (1 Hr. a\ Temp.) 



Chart 60. — The effect of annealing on the grain-growing character- 

 istics of Government 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. (61.51 % copper, 0.57 % tin, balance zinc) 

 (0.040-in. stock). 



CO 



no 



100 



90 



: 80 



3" 

 5 



t- 70 



0) 

 Q. 



6 60 



i 50 



40 



30 



20 



CR 400 500 600 700 800 900 1000 1100 1200 1300 

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



Chart 61. — The effect of annealing on the tensile strength and 

 apparent elastic limit of Government 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. (61.51 % copper, 0.57 % tin, 

 balance zinc) (0.040-in. stock). 



110 



100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 

 10 







C 



D 4O0 500 600 700 800 900 1000 1100 1200 1300 

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



Chart 62. — The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of Government naval-brass strip, previ- 

 ously cold-rolled 6 B. & S. Nos. (50 per cent reduction of area) from 

 two different grain sizes, 0.015 and 0.080 mm. (61.51 % copper, 0.57 % 

 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 Temip) 



Chart 63. — The effect of annealing on the yield strength of Govern- 

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

 cent reduction of area) from a grain size of 0.015 mm. (61.51 % copper, 

 0.57 % tin, balance zinc) (0.040-in. stock) . 



