102 



Copper and Copper-base Alloys 



Ex+r. 10 20 30 40 50 60 



Percent Reduction by Cold Drawing 



Chart 35. — The effect of cold drawing on the yield strength of 

 leaded high-brass rod, previously extruded to a grain size of 0.045 mm. 

 (63.89 % copper, 1.38 % lead, balance zinc) (rod under 1 in. in diam- 

 eter). 



80 



70 



60 



£50 

 cr 

 I/) 



1. 40 

 (u 



Q. 



^ 30 



o 



S 20 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deq.F. ( I Hr at Temp.) 



Chart 36. — The effect of annealing on the tensile strength, apparent 

 elastic limit, and grain size of leaded high-brass rod, previously cold- 

 drawn 38 per cent (reduction of area) from extruded material having 

 a grain size of. 0.045 mm. (63.89 % copper, 1.38 % lead, balance zinc) 

 (rod under 1 in. in diameter). 



i«:|IO 

 o 

 o 

 100 



CD 



90 



J? 80 



70 



60 



^ 50 



£ 40 

 o 30 



■^ 20 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. F( IHr. at Temp.) 



Chart 37. — The effect of annealing on the Rockwell hardness, per- 

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

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

 from extruded material having a grain size of 0.045 mm. (63.89 % 

 copper, 1.38 % lead, balance zinc) (rod under 1 in. in diameter). 



70 



60 



50 



,40 



30 



20 



400 500 600 700 800 900 1000 1100 1200 1300 

 Temperature^ Deg.F. (IHr. at Temp.) 



Chart 38. — The effect of annealing on the yield strength of leaded 

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

 from extruded material having a grain size of 0.045 mm. (63.89 % 

 copper, 1.38 % lead, balance zinc) (rod under 1 in. in diameter). 



