192 



Copper and Copper-base Alloys 



10 20 30 40 50 60 70 80 90 100 

 Percenf Reduction in Thickness 



Chart 1. — The effect of cold rolling on the percentage reduction of 

 area and percentage elongation in 2 in. of 30 per cent nickel-silver 

 strip (29.77 % nickel, 62.02 % copper, balance zinc), previously annealed 

 at 1450°F. according to Cook.'^e) 



120 



no 



100 



90 



C 80 



c^70 



1- 



lU 



Q. 60 



o 50 

 o 

 S 40 



50 



20 



10 







100 



10 20 30 40 50 60 70 80 ' 90 

 Percent Reduction in Thickness 



Chart 2. — The effect of cold rolling on tensile strength, proof 

 strength, and proportional limit of 30 per cent nickel-silver strip 

 (29.77 % nickel, 62.02 % copper, balance zinc), previously annealed at 

 1450°F. according to Cook.'-" 



220 



200 



ISO 



160 



140 



I 120 



> 100 



S 80 



"2 60 



D 



X 

 40 



20 



10 20 30 40 50 60 70 80 90 

 Percent Reduction in Thickness 

 Chart 3. — The effect of cold rolling on the hardness of 30 per cent 

 nickel-sUver strip (29.77 % nickel, 62.02 % copper, balance zinc) 

 previously annealed at 1450°F. according to Cook.<=«' 



O C 



— 0) 





120 



no 



100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 

 10 



600 800 1000 1200 1400 1600 



Annealing Temp.in Deg.lr (1 Hr at Temp.) 

 Chart 4. — The effect of annealing on the tensile strength, Erichsen 

 value, and percentage elongation in 2 in. of 30 per cent nickel-silver 

 strip (29.77 % nickel, 62.02 % copper, balance zinc), previously cold- 

 rolled 60 per cent according to Cook.'^s) 



