228 



Copper and Copper-base Alloys 



100 

 90 



80 

 $, 70 

 ^ 60 

 o 50 



o 

 o 



~ 4-0 

 30 

 20 

 10 







11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 

 Percent Reduction of Area by Rolling 

 12545678 

 BXS Numbers Hard 

 Chart 1. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of 70-30 cupro-nickel strip, previously annealed 

 to two different grain sizes, 0.015 and 0.070 mm. (68.94 % copper, 

 29.61 % nickel) (0.040-in, stock). 



11.0 20.7 294 372 44.0 50.0 55.5 60.5 

 Percent Reduction of Area by Rolling 

 012345678 

 B3.S Numbers Hard 



Chart 2. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of 70-30 cupro-nickel strip, previously 

 annealed to two different grain sizes, 0.015 and 0.070 mm. (68.94 % 

 copper, 29.61 % nickel) (0.040-in. stock). 



_£ 90 

 f 80 



g 60 



o 



x" 50 

 S 40 



1^0 



>: 20 



10 



11.0 20.7 29.4 372 48.0 50.0 55.5 60.5 

 Percent Reduction of Area by Rolling 

 1 2345678 

 BXS Numbers Hard 

 Chart 3. — The effect of cold rolling on the yield strengths of 70-30 

 cupro-nickel strip, previously annealed to a grain size of 0.015 mm. 

 (68.94 % copper, 29.61 % nickel) (0.040-in. stock). 



11.0 20.7 294 372 48.0 50.0 55.5 60.5 

 Percent Reduction of Area by Rolling 

 012345678 

 BS.S Numbers Hard 

 Chart 4. — The effect of cold rolling on the yield strengths of 70-30 

 cupro-nickel strip, previously annealed to a grain size of 0.070 mm. 

 (68.94 % copper, 29.61 % nickel) (0.040-in. stock) 



