108 



Copper and Copper-base Alloys 



ll.O 20.7 29.4 37.2 44-.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Polling 

 01 2345 6789 10 

 B5,S Numbers Hard 



Chart 55. — The effect of cold rolling on the yield strengths of 

 engraver's brass strip, previously annealed to a grain size of 0.015 mm. 

 (63.37 % copper, 1.53 % lead, balance zinc) (0.040-in. stock). 



90 



80 



70 



i 60 

 cr 



^ 50 



_j 



o 40 



o 



o 



-■ 30 

 20 

 10 



11.0 20.7 29.4 37Z 440 50.0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Polling 

 01 23456789 10 

 BS^S Numbers Hard 



Chart 56. — The effect of cold rolling on the yield strengths of 

 engraver's brass strip, previously annealed to a grain size of 0.080 mm. 

 (63.37 % copper, 1.53 % lead, balance zinc) (0.040-in. stock). 



0.100 



0.080 



E 0.060 



0.040 



0020 



800 900 1000 1100 1200 



Anneoling Temp. in Deq.F. (1 Hr.at Temp.) 



1300 



Chart 57. — The effect of annealing on the grain-growing character- 

 istics of engraver's 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. (63.37 % copper, 1.53 % lead, balance zinc) (0.040-in. 

 stock). 



110 



100 



90 



80 



£ 70 

 cr 



60 



50 



40 



-- 30 







CR 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. E ( I Hr at Temp.) 



Chart 58. — The effect of annealing on the tensile strength and 

 apparent elastic limit of engraver's brass strip (63.37 % copper, 1.53 % 

 lead, balance zinc) , previously cold-rolled 6 B. & S. Nos. (50 per cent 

 reduction of area) from two different grain sizes, 0.015 and 0.080 mm. 

 (0.040-in. stock). 



