The Cupro-nickels 



229 



O.O80 



0.060 



0.040 



0.020 



0.000 



1200 1300 1400 1500 1500 



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



Chart 5. — The effect of annealing on the grain-growing charac- 

 teristics of 70-30 cupro-nickel strip, previously cold-rolled 6 B. & S. 

 Nos. (50 per cent reduction of area) from two different grain sizes, 

 0.015 and 0.070 mm. (68.94 % copper, 29.61 % nickel) (0.040-in. stock). 



CR 700 800 900 1000 1100 1200 1300 1400 1500 1600 

 Annealing Temp, in Deg.F (1 Hn at Temp.) 



Chakt 6. — The effect of annealing on the tensile strength and 

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

 rolled 6 B. & S. Nos. (50 per cent reduction of area) from two different 

 grain sizes, 0.015 and 0.070 mm. (68.94 % copper, 29.61 % nickel) 

 (0.040-in. stock). 



^^no 



-100 



90 



80 



^ 70 



D 60 



■=^ 50 



40 



o 30 



I 20 

 I 10 



Di 







CR 700 800 900 1000 1100 1200 1300 1400 1500 1600 

 Annealing Temp, in Deg.l^ (iHr ai" Temp.) 

 Chart 7. — The effect of annealing on the Rockwell hardness and 

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

 cold-roUed 6 B. & S. Nos. (50 per cent reduction of area) from two 

 different grain sizes, 0.015 and 0.070 mm. (68.94 % copper, 29.61 % 

 nickel) (0.040-in. stock). 



90 

 80 

 70 



£ 60 



cr 

 '^ 50 



"^40 



-O 



§ 30 

 o 

 "" 20 



10 



CR 700 800 900 1000 1100 1200 1300 1400 1500 1600 

 Annealing Temp, in Deg.F (lHr.a+ Temp.) 

 Chart 8. — The effect of annealing on the yield strength of 70-30 

 cupro-nickel strip, previously cold-rolled 6 B. & S. Nos. (50 per cent 

 reduction of area) from a grain size of 0.015 mm. (68.94 % copper, 

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



