The Tin Brasses 



159 



100 

 90 

 80 

 70 



: 60 



r 

 > 

 . 50 



i 40 

 I 



! 30 

 20 

 10 

 



11.0 20.7 25!4 372 440 50.0 555. 60.5 648 

 Percent Reduc+ion of Area by Rolling 



10 



2 3 4 5 6 7 

 BS-S Numbers Hard 



Chart 78. — The effect of cold rolling on the yield strengths of hard- 

 naval-brass strip, previously annealed to a grain size of 0.015 mm. 

 (61.50 % copper, 0.75 % tin, balance zinc) (0.040-in. stock). 



11.0 20.7 29.4 372 44.0 50.0 55.5 605 64.8 68.6 

 Percent Reduction of Area by Rolling 

 0! 23456 789 10 

 BSS Numbers Hard 



Chart 79. — The effect of cold rolling on the yield strengths of hard- 

 naval-brass strip, previously annealed to a grain size of 0.080 mm. 

 (61.50 % copper, 0.75 % tin, balance zinc) (0.040-in. stock). 



CR 400 500 600 700 800 900 \Q<^ 1100 1200 1300 

 Annealing Temp. In Deg.FflHrat Temp.) 



Chart 80. — The effect of annealing on the tensile strength and 

 apparent elastic limit 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). 



900 1000 1100 1200 1300 



Annealing Temp, in Deg. Ffl Hr: af Temp.) 



Chart 81. — The effect of annealing on the grain-growing character- 

 istics 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). 



