The Cupro-nickels 



231 



CD 700 800 900 1000 1100 1200 1300 1400 1500 1600 



Chakt 13. — The effect of annealing on the tensile strength and 

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

 drawn 70 per cent (reduction of area) from a grain size of 0.065 mm. 

 (68.94 % copper, nickel 30.15 %, 0.26 % iron, 0.60 % manganese). 



CD 700 800 900 1000 1100 1200 1500 1400 1500 1600 



Chart 14.- — The effect of annealing on the Rockwell hardness, 

 percentage elongation in 2 in., and grain size of 70-30 cupro-nickel 

 tube, previously cold-drawn 70 per cent (reduction of area) from a 

 grain size of 0.065 mm. (68.94 % copper, 30.15 % nickel, 0.26 % iron, 

 0.60 % manganese). 



100 



90 



" 80 



70 



;6o 



50 

 40 

 30 

 20 

 10 



200 400 600 800 1000 1200 1400 

 Temperajure in Deg. F (l Hn at Temp.) 



Chart 15. — The effect of elevated temperature on the tensile 

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

 previously cold-drawn 80 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). 



100 



90 



^ 80 

 cr 



CO 



!- 70 



OJ 

 D- 



^ 60 



_j 



§ 50 



CD 



40 

 30 

 20 



10 







10 20 30 AO 50 60 70 80 90 100 

 Percent Reduction in Area by Cold Drawing 

 Chart. 16. — The effect of cold drawing on the tensile strength, 

 percentage reduction of area and apparent elastic Umit 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). 



