The Coppers 



HD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp. Deg. R (l Hr. a+ Temp.) 



Chart 19. — The effect of annealing on the Rockwell F hardness, 

 percentage reduction of area, and percentage elongation in 2 in. of 

 electrolytic (tough-pitch) copper rod (99.93 % copper, 0.04 % oxygen) 

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

 size of 0.030 mm. (rod under 1 in. in diameter). 



CR 400 500 600 700 800 900 1000 1100 1200 1500 

 Temp, in Deg. F. (I Hr. at Temp.) 



Chaht 20. — The effect of annealing on the yield strengths of electro- 

 lytic (tough-pitch) copper rod (99.93 % copper, 0.04 % oxygen) 

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

 size of 0.030 mm. (rod under 1 in. in diameter). 



200 400 600 800 1000 1200 1400 1600 1800 

 Temperature in Deg.F(lHr. at Temp) 

 -The effect of elevated temperatures on the tensile strength, percentage elongation in 2 in., and percentage reduction of area of elec- 

 trolytic (tough-pitch) copper rod previously cold-drawn 25 per cent (reduction of area) (rod under 1 in. in diameter). 



