116 



Copper and Copper-base Alloys 



:I00 

 I 90 



I 80 

 \ 70 

 t 60 

 50 

 40 

 30 

 20 



10 20 30 40 50 



Percent Reduction by Cold Working 



Chart 80. — The effect of cold drawing on the tensile strength and 

 apparent elastic limit of free-cutting brass rod, previously extruded to 

 a grain size of 0.030 mm. (60.99 % copper, 3.13 % lead, balance zinc) 

 (rod under 1 in. in diameter). 



90 



80 



70 



^ cu 



i d 60 

 D — 

 CD <N 



''^ c 50 



40 



30 



20 



V R" 10 



ki LU 



10 20 30 40 50 



Percent Reduction by Cold Working 



Chart 81. — The effect of cold drawing on the Rockwell hardness, 

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

 free-cutting brass rod, previously extruded to a grain size of 0.030 mm. 

 (60.99 % copper, 3.13 % lead, balance zinc) (rod under 1 in. in diam- 

 eter) . 



^70 



65 



O 



o 



-- 60 



1 55 

 150 







n: 45 



u 40 

 D 



g:35 

 < 



"^ 30 

 o 

 i 25 



5 20 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp. in Deg.F ( 1 Hr. at Temp.) 



Chart 82. — The efTect of annealing on the tensile strength, apparent 

 elastic limit, and grain size of free-cutting brass rod, previously cold- 

 drawn 30 per cent (reduction of area) from extruded material having 

 a grain size of 0.030 mm. (60.99 % copper, 3.13 % lead, balance zinc) 

 (rod under 1 in. in diameter). 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg.EflHr.at Temp.) 



Chart 83. — The effect of annealing on the Rockwell hardness, per- 

 centage elongation in 2 in., and percentage reduction of area of free- 

 cutting brass rod, previously cold-drawn 30 per cent from extruded 

 material having a grain size of 0.030 mm. (60.99 % copper, 3.13 % lead, 

 balance zinc) (rod under 1 in. in diameter). 



