The Leaded Brasses 



121 



Ex+r. 10 20 30 40 



Percent Reduction by Cold Working 

 Chart 96. — The effect of cold drawing on the yield strength of deep- 

 drilling rod, previously extruded to a grain size of 0.050 mm. (62.11 % 

 copper, 4.00% lead, balance zinc) (rod under 1 in. in diameter). 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Temperature^ Deg. 1^(1 Hr. a+ Temp.) 



Chabt 97. — The effect of annealing on the tensile strength, apparent 

 elastic limit, and grain size of deep-drilling rod, previously cold-drawn 

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

 size of 0.050 mm. (62.11% copper, 4.00% lead, balance zinc) (rod 

 under 1 in. in diameter). 



7100 



TS 



_§ 90 



cj> 



^ 80 

 o 



u- 70 



^ 60 

 . u> 



■^50 



v> 



0) 



I 40 

 I 30 

 I 20 



U 



o 10 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. F. Cl Hr. at Temp.) 



Chart 98. — The effect of annealing on the Rockwell hardness, percentage elongation in 2 in., and percentage reduction of area of deep- 

 drilling rod, previously cold-drawn 30 per cent (reduction of area) from extruded material having a grain size of 0.050 mm. (62.11 % copper, 

 4.00 % lead, balance zinc) (rod under 1 in. in diameter). 



