The Leaded Brasses 



119 



EX+T 



10 20 30 40 50 



Percent Reduction by Cold Working 



Chart 90. — The effect of cold drawing on the yield strength of low- 

 leaded brass rod, previously extruded to a grain size of 0.030 mm. 

 (62.95 % copper, 0.60 % lead, balance zinc) (rod under 1 in. in diam- 

 eter). 



70 



^ 60 



Tt 50 

 E 



40 



30 



20 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. F ( 1 Hr. a+ Temp.) 



Chart 91. — The effect of annealing on the tensile strength, apparent 

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

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

 a grain size of 0.030 mm. (62.95 % copper, 0.60 % lead, balance zinc) 

 (rod under 1 in. in diameter). 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp. in Deg. F. (IHrat Temp.) 

 Chart 92. — The effect of annealing on the Rockwell hardness, per- 

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

 leaded brass rod, previously cold-drawn 30 per cent (reduction of area) 

 from extruded material having a grain size of 0.030 ram. (62.95 % 

 copper, 0.60 % lead, balance zinc) (rod under 1 in. in diameter). 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in.Deg.F (iHnaf Temp.) 

 Chart 93. — The effect of annealing on the yield strength of low- 

 leaded brass rod, previously cold-drawn 30 per cent (reduction of area) 

 from extruded material having a grain size of 0.030 mm. (62.95 % 

 copper, 0.60 % lead, balance zinc) (rod under 1 in. in diameter). 



