74 



Copper and Copper-base Alloys 



Ex+r. 10 20 30 40 50 - 60 



Percent f?educ+ion by Cold Drawing 



110 

 100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 



10 

 



Ex+r. 



10 20 30 40 50 



Percent Reduction by Cold Working 



Ch-^kt 143. — The effect of cold drawing on the tensile strength and Chart 144. — The effect of cold drawing on the Rockwell hardness, 



apparent elastic limit of common high-brass rod, previously annealed percentage elongation in 2 in. and percentage reduction of area of 



to a grain size of 0.040 mm. (64.87 % copper) (rod under 1 in. in diam- common high-brass rod, previously annealed to a grain size of 0.040 



eter). mm. (64.87 % copper) (rod under 1 in. in diameter). 



80 



70 



cr 60 



50 



c 40 



30 



20 



Extr 10 20 30 40 50 



Percent Reduction by Cold Drawing 



60 



CejIrt 145. — The effect of cold drawing on the yield strength of 

 common high-brass rod, previously annealed to a grain size of 0.040 

 mm. (64.87 % copper) (rod under 1 in. in diameter). 



80 



70 



60 



50 



V. 40 



o 30 



20 



400 600 800 1000 1200 1400 



Annealing Temp.in Deg.E (IHr.at Temp.} 



Chabt 146. — The effect of annealing on the tensile strength, 

 apparent elastic limit, and grain size of common high-brass rod, 

 previously cold-drawn 40 per cent (reduction of area) from material 

 having a grain size of 0.040 mm. (64.87 % copper) (rod under 1 in. in 

 diameter). 



