232 



Copper and Copper-base Alloys 



10 20 30 40 50 60 70 80 90 lOO 

 Percen-t Reduction in Area by Cold Drawing 



Chakt 17. — The effect of cold drawing on the Rockwell hardness 

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

 annealed to a grain size of 0.035 mm. (68.56 % copper, 30.48 % nickel, 

 0.39 % iron, 0.57 % manganese) (rod under 1 in. in diameter) . 



1 10 



100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 

 10 



10 20 30 40 50 60 70 80 90 100 

 Percent Reduction by Cold Work 



Chart 18. — The effect of cold drawing on the yield strength of 

 70-30 cupro-nickel rod, previously annealed to a grain size of 0.035 mm. 

 (68.56 % copper, 30.48 % nickel, 0.39 % iron, 0.57 % manganese) (rod 

 under 1 in. in diameter). 



CD 700 800 900 1000 1100 1200 1300 1400 1500 1600 

 Annealing Temp, in Deg.F.f IHr at Temp.) 



CH..VHT 19. — The effect of annealing on the tensile strength, apparent 

 elastic limit, and percentage reduction in area of 70-30 cupro-nickel rod, 

 previously cold-drawn 50 per cent (reduction of area) from material 

 having a grain size of 0.035 mm. (68.56 % copper, 30.48 % nickel, 0.39 % 

 iron, 0.57 % manganese) (rod under 1 in. in diameter). 



1100 1200 1300 1400 1500 1600 1700 



Annealing Temp, m Deg.Hf IHr at Temp.) 

 Chart 20. — The effect of annealing on the grain-growing charac- 

 teristics of 70-30 cupro-nickel rod, previously cold-drawn 50 per cent 

 (reduction of area) from material having a grain size of 0.035 mm. 

 (68.56 % copper, 30.48 % nickel, 0.39 % iron, 0.57 % manganese) (rod 

 under 1 in. in diameter). 



