100 



d-80 

 70 



V) 



:3 60 



1 50 



40 



30 



20 



Copper and Copper-base Alloys 

 no 

 100 



90 



80 



70 



60 



50 



40 

 ■ 30 



20 



to 



10 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.F (1 Hr. at Temp.j 



Chart 29. — The effect of annealing on the yield strength of leaded 

 high-brass strip, previously cold-rolled 6 B. & S. Nos. (50 per cent 

 reduction of area) from a grain size of 0.080 mm. (65.19 % copper, 

 1.09 % lead, balance zinc) (0.040-in. stock). 



57 



15 



10 20 30 40 50 60 70 Q^ 90 100 

 Rockwell Hardness B '/i6"Ball-100Kg.Load 



63 69 74 80 86 91 97 - - 

 Rockwell Hardness F '/le" Ball 60 Kg. Load 



64 67 71 74 77 &Q 84 87 90 93 

 Rockwell Hardness 15-T yi6"Ball ISKg.Load 



22 29 36 43 50 57 64 70 76 82 

 Rockwell Hardness 30-T Ye" Ball 30 Kg. Load 



Chart 30. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of leaded high-brass 

 strip (65.19 % copper, 1.09 % lead, balance zinc) when only Rockwell 

 hardness is known. It is accurate for all thicknesses between 0.020 

 and 0.080 In. within the given limits. 



0.001 0.002 0.003 0.004 0.005 0006 0.007 O008 0009 0.010 

 Strain, Inches per Inch 

 Chart 31. — The effect of cold rolling on the stress-strain charac- 

 teristics of leaded high-brass strip (65.19 % copper, 1.09 % lead, balance 

 zinc) having a ready-to-finish grain size of 0.015 mm. ; 5,000-lb. capacity 

 hydraulic testing machine and Templin automatic extensometer 

 accurate to 0.00001 in. used (0.040-in. stock). 



0.001 0.002 0003 0.004 0005 0.006 0007 0.008 0.009 0.010 

 Strain, Inches per Inch 



Chart 32. — The effect of cold rolling on the stress-strain characteris- 

 tics of leaded high-brass strip (65.19% copper, 1.09% lead, balance 

 zinc) having a ready-to-finish grain size of 0.080 mm. ; 5,000-lb. capacity 

 hydraulic testing machine and Templin automatic extensometer 

 accurate to 0.00001 in. used (0.040-in. stock). 



