94 



Copper and Copper-base Alloys 



100 



qo 



80 

 . 70 



60 

 50 

 40 

 30 

 20 

 10 



11.0 20.7 2Q.4 372 44.0 50.0 55.5 60.5 648 68.6 

 Percen-f Reduction of Area by Rolling 

 01 2345678'? 10 

 B and S Numbers Hard 



Chart 8. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of Lancashire brass strip, previously annealed 

 to two different grain sizes, 0.015 and 0.065 mm. (73.53 % copper, 

 2.24% lead, balance zinc) (0.040-in. stock). 



11.0 207 294 372 44.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 i 2345 6789 10 

 B and S Numbers Hard 



Chart 9. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of Lancashire brass strip, previously 

 annealed to two different grain sizes, 0.015 and 0.065 mm. (73.53 % 

 copper, 2.24% lead, balance zinc) (0.040-in. stock). 



qo 



_c 

 6- 80 



00 



q5 70 



CL 



3 60 



I 50 



40 



30 



20 



11.0 207 29.4 372 44.0 50.0 55.5 60 5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 .0 1 2345 678 9 10 

 B and S Numbers Hard 



Chart 10. — The effect of cold rolling on the yield strengths of 

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

 (73.53 % copper, 2.24 % lead, balance zinc) (0.040-in. stock). 



^80 



^70 



5 60 

 o 

 § 50 



40 



30 



20 



10 



11.0 207 29.4 372 44.0 500 55.5 60.5 648 686 

 Percent Reduction of Area by Rolling 

 12 3456789 10 

 B and S Numbers Hard 



Chart 11. — The effect of cold rolling on the yield strengths of 

 Lancashire brass strip, previously annealed to a grain size of 0.065 mm. 

 (73.53 % copper, 2.24 % lead, balance zinc) (0.040-in. stock). 



