The Cupro-nickels 



235 



11.0 20.7 29.4 37.2 44.0 50.0 55.5 605 64.8 68.6 

 Percent Reduction of Area by Rolling 

 0! 2345 6 78 9 10 

 BB^S Numbers Hard 

 Chakt 24. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of 80-20 cupro-nickel strip, previously annealed 

 to two different grain sizes, 0.015 and 0.055 mm. (78.18 % copper, 

 20.65 % nickel, 0.51 % manganese) (0.040-in. stock). 



11.0 20.7 294 372 440 50.0 55.5 60.5 648 68.6 

 Percent Reduction of Area by Polling 

 01 2345 6789 10 

 B'S^S Numbers Hard 

 Chart 25. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of 80-20 cupro-nickel strip, previously 

 annealed to two different grain sizes, 0.015 and 0.055 mm. (78.18 % 

 copper, 20.65 % nickel, 0.51 % manganese) (0.040-in. stock). 



11.0 207 29.4 372 440 500 55.5 605 648 68.6 

 Percent Reduction of Area by Rolling 

 0123456789 10 

 B S- S Numbers Hard 

 Chart 26. — The effect of cold rolling on the yield strengths of 80-20 

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

 (78.18 % copper, 20.65 % nickel, 0.51 % manganese) (0.040-in. stock). 



11.0 20.7 29.4 372 440 500 555 60.5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 01 23456789 10 

 BS^S Numbers Hard 

 Chart 27. — The effect of cold rolling on the yield strengths of 80-20 

 cupro-nickel strip, previously annealed to a grain size of 0.055 mm. 

 (78.18 % copper, 20.65 % nickel, 0.51 % manganese) (0.040-in. stock). 



