78 



Coppe?- and Copper-base Alloys 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg.l%( IHr.at Temp.) 



Chart 156. — The effect of annealing on the Rockwell hardness, 

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

 brass rod, previously cold-drawn 38 per cent (reduction of area) from 

 material having a grain size of 0.045 mm. (62.45 % copper) (rod under 

 1 in. in diameter). 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.Kfl Hr. a+ Temp.) 



Ch.irt 157. — The effect of annealing on the yield strength of common 

 brass rod, previously cold-drawn 38 per cent (reduction of area) from 

 material having a grain size of 0.045 mm. (62.65 % copper) (rod under 

 1 in. in diameter). 



40 



30 



20 



200 400 600 800 1000 

 Tempera+ure, Deg.RCl Hr. a+ Temp.) 



1200 



Cb.vet 158. — The effect of elevated temperature on the Izod-impact 

 strength of previously annealed common brass (64.00 % copper) 

 according to D. Bunting.'"* 



Footnotes to Table 10 

 « Refers to rod cold-drawn 30%; rod under 1 in. 

 finish grain size, 0.010 mm. 



t Refers to a 900°F. anneal (1 hr.). 



<= Material cold-struck from forged condition. 



<* All tests conducted on 0.040-in. stock. 



« 6 B. & S. Nos., hard, 0.045-0.015 mm. grain size 



/ Refers to 1300°F. anneal (1 hr. at temperature). 



» Cold-drawn to Yi by 0.049 in. 



« 1200°F. anneal (1 hr.). 



I diameter with ready-to- 



at ready-to-finish. 



