52 



i 100 



OQ 



■D 90 

 o 

 o 



1,80 

 I 70 

 i 60 



CO 



'^ 50 

 S 40 

 i 30 



Copper and Copper-base Alloys 



70 



60 



= 20^:^^=^ 



CD. 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg.Hf IHr.a-J-Temp.) 



Chabt 71. — The effect of annealing on the Rockwell hardness, 

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

 low-brass rod, previously cold-drawn 37 per cent (reduction of area) 

 from material having a grain size of 0.060 mm. (80.95 % copper) (rod 

 under 1 in. in diameter). 



50 



'40 



30 



20 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg.F.f IHr.a+Temp.) 



Chart 72. — The effect of annealing on the yield strength of low- 

 brass rod, previously cold-drawn 37 per cent (reduction of area) from 

 material having a grain size of 0.060 mm. (80.95 % copper) (rod under 

 1 in. in diameter). 



200 400 600 800 1000 1200 1400 1600 

 Temperature in Deg.R (iHr at Temp.) 



Ch.\kt 73. — The effect of elevated temperature on tensile strength, 

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

 80-20 (low-brass) rod (80.12% copper), previously cold-worked 30 

 per cent (reduction of area) according to W. B. Price.'" 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg. F! fl Hr at Temp.) 



Chabt 74. — The effect of annealing on the tensile strength and 

 apparent elastic limit of 80-20 (low-brass) tubing, previously cold- 

 worked 70 per cent (reduction of area) from a grain size of 0.025 mm. 

 (79.74% copper). 



