The Coppers 



11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Per Cent Reduction of Area by Rolling 

 01 2 3456789 10 

 Band S Numbers Hard 



Chart 3. — The effect of cold rolling on the Rockwell hardness and 

 percentage elongation in 2 in. of electrolytic (tough-pitch) copper 

 (99.92 % copper, 0.05 % oxygen) strip previously annealed to two differ- 

 ent grain sizes (0.015 and 0.045 mm.) (0.040-in. stock). 



11.0 20.7. 29.4 372 44.0 50.0 55.5 60.5 648 68.6 

 Percent Reduction of Area by Rolling 

 123456789 10 

 B and S Numbers Hard 



Chart 4. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of electrolytic (tough-pitch) copper (99.92 % 

 copper, 0.05 % oxygen) strip previously annealed to two different grain 

 sizes (0.015 and 0.045 mm.) (0.040-in. stock). 



11.0 20.7 29.4 37.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Ffercent Reduction of Area by Rolling 

 01 23456789 10 

 B and S Numbers Hard 



Chart 5. — The effect of cold rolling on the yield strengths of electro- 

 lytic (tough-pitch) copper (99.92 % copper, 0.05 % oxygen) strip 

 previously annealed to a grain size of 0.015 mm. (0.040-in. stock). 



11.0 20.7 29.4 372 44.0 50.0 55.5 60.5 64.8 68.6 

 Percent Reduction of Area by Rolling 

 1 23456789 10 

 Bands Numbers Heard 



Chart 6. — The effect of cold rolling on the yield strengths of electro- 

 lytic (tough-pitch) copper (99.92 % copper, 0.05 % oxygen) strip 

 previously annealed to a grain size of 0.045 mm. (0.040-in. stock). 



