The Cupro-nickels 



233 



no 



oioo 



"S 90 



80 



S 70 



^ 60 



'S 50 



40 



30 



= 20 



CD 700 800 900 lOOO 1100 1200 1300 1400 1500 I60O 

 Annealing Temp, in Deg.f; (I Hr: a+ Temp.) 

 Chart 21. — The effect of annealing on the Rockwell hardnesa 

 and percentage elongation in 2 in. 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) . 



CD 700 800 900 1000 HOD I20D DOO 1400 1500 1600 I700 

 Annealing Temp in Deg.E C Hn at Temp.) 

 Chaht 22. — The effect of annealing on the yield strength of 70-3D 

 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). 



0.001 0.002 0003 0.004 0.005 QO0B 



Strain^ Inches per ho. 

 Chakt 23. — The effect of cold drawing on the stress-strain characteristics of 70-30 cupro-nickel rod (under 1 in. in diameter) having a ready- 

 to-finish grain size of 0.035 mm. ; 100,000-lb. capacity hydraulic testing machine and Templin automatic extensometer accurate to 0.00001 in. 

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



