236 



Copper and Copper-base Alloys 



ao60 



0.050 



E. 



S Q040 



wj 



•§ Q030 

 C 

 <3 



G020 



QOlO 



1600 



1200 1300 1400 1500 



Annealing Temp, in Deg. Ff I Hn a+ Temp^ 

 Chart 28. — The effect of annealing on the grain-growing charac- 

 teristics of 80-20 cupro-mckel strip, previously cold-roUed 6 B. & S. 

 Nos. (50 per cent reduction of area) from two different grain sizes, 0.015 

 and 0.055 mm. (78.18% copper, 20.65% nickel, 0.51% manganese) 

 (ff.040-in. stock). 



100 



90 



80 



70 



£ 60 



IT* 



'eso 



>' 



§ 30 

 o 



20 



700 80O 900 1000 1100 1200 1300 1400 1500 1600 

 Annealing Temp, in Deg.F Hr af Temp.) 



Chart 29. — The effect of annealing on the tensile strength and 

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

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

 grain sizes, 0.015 and 0.055 mm. (78.18% copper, 20.65% nickel, 

 0.51 % manganese) (0.040-in. stock) . 



.sMlO 



100 



80 



70 



60 



50 



40 



30 



=S 20 



Room 700 800 900 LOOO 1100 1200 1300 1400 1500 1600 

 Annealing Temp, in Deg.FOHn a+ Temp.) 



Chart 30. — The effect of annealing on the Rockwell hardness and 

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

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

 different grain sizes, 0.015 and 0.055 mm. (78.18% copper, 20.65% 

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



CR 700 %Q0 900 1000 IIOO 1200 1300 1400 1500 1600 

 Annealing Temp, in Deg.lTCl Hnaf Temp.) 



Ch.\rt 31. — The effect of annealing on the yield strength of 80-20 

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

 reduction of area) from a grain size of 0.015 mm. (78.18 % copper, 

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



