The Coppers 



60 



50 



CR 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. H (I Hn a+ Temp.) 



Chaet 11. — The effect of annealing on the yield strengths of electro- 

 Is^tic (tough-pitch) copper previously cold-rolled 6 B. & S. Nos. hard 

 (50 per cent reduction of area) from a ready-to-finish grain size of 

 0.045 mm.) (0.040-in. stock). 



^ 40 



30 



20 



10 



30 40 50 60 70 80 90 100 



Rockwell Hardness F-]g'Ball 60 Kg. Load 



5 23 40 58 76 



•Rockwell Hardness B--j^'Ball 100 Kg. Load 



63 68 74 80 85 

 Rockwell Hardness IB-T-j^'Ball ISKg.Load 



19 31 43 55 67 

 Rockwell Hardness 30-T-^ Ball 30 Kg. Load 



Chart 12. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation in 2 in. of electrolytic 

 (tough-pitch) copper when only Rockwell hardness is known. It is 

 accurate for all thicknesses between 0.020 and 0.080 in. within the 

 given limits. 



60 - 



50 



40 



o 30 



20 



0.001 0.002 0.003 a004 0.005 Q006 



Strain- Inches per In. 



Chart 13. — The effect of cold roLUng on the stress-strain character- 

 istics of electrolytic (tough-pitch) copper strip having a ready-to-finish 

 grain size of 0.015 mm. (0.040-in.-thick stock); 5,000-lb. capacity 

 hydraulic testing machine and Templin automatic extensometer 

 accurate to 0.00001 in. used. 



aooi 



aoo2 0003 aoo4 qoos 



strain- Inches per In- 



0006 



Chart 14. — The effect of cold rolling on the stress-strain character- 

 istics of electrolytic (tough-pitch) copper strip having a ready-to-finish 

 grain size of 0.045 mm. (0.040-in.-thick stock); 5,000-lb. capacity 

 hydraulic testing machine and Templin automatic extensometer 

 accurate to 0.00001 in. used. 



