44 



60 



70 



60 

 C 50 



40 



30 



o 20 



Copper and Copper-base Alloys 



90 



80 

 c 



g.60 



o 50 



o 



o 



J 40 



cri '^ 



CR 



Chart 

 low-brass 

 reduction 

 (0.040-in. 



400 500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp, in Deg.F. (j hr. a+ Temp.) 

 44. — The effect of annealing on the yield strength of rich 

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

 of area) from a grain size of 0.070 mm. (85.42 % copper) 

 stock). 



^ 20 



£ 10 



40 50 60 70 80 90 100 110 



Rockwell Hardness F- V\6 Ball 60 Kg. Load 



5 23 40 58 76 



Pockwell Hardness B- Me Ball lOOKg.Load 



63 68 74 80 85 



Rockwell Hardness 15-1^16 Ball 15 Kg. Load 



19 31 43 55 67 



Rockwell Hardness 30-T Me Ball 30Kg.Load 



Chart 45. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of rich low-brass 

 strip (85.42 % copper) when only Rockwell hardness is known. It is 

 accurate for all thicknesses between 0.020 and 0.080 in. within the 

 given limits. 



0.002 0.004 0.005 Q008 0.010 



S+rain^ Inches per In. 



Chart 46. — The effect of cold working on the stress-strain charac- 

 teristics of rich low-brass strip (0.040 in. thick) having a ready-to- 

 finish grain size of 0.015 mm. (85.42% copper); 5,000-lb. capacity 

 hydraulic testing machine and Templin automatic extensometer 

 acciirate to 0.00001 in. used. 



0.001 0.002 0.003 0.004 0.005 0.006 



Strain- Inches per In. 

 Chart 47. — The effect of cold working on the stress-strain charac- 

 teristics of rich low-brass strip (0.040 in. thick) having a ready-to- 

 finish grain size of 0.070 mm. (85.42 % copper) ; 5.000-lb. capacity 

 hydraulic testing machine and Templin automatic extensometer 

 accurate to 0.00001 in. used. 



