68 



Copper and Copper-base Alloys 



100 

 90 

 80 

 70 

 60 



<u 50 



40 



o 30 



20 



400 500 600 700 800 900 1000 1100 1200 1300 

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



Chart 123. — The effect of annealing on the yield strength of deep- 

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

 reduction of area) from a grain size of 0.015 mm. (68.41 % copper) 

 (0.040-in. stock). 



90 



80 



70 



d 60 



Q-40 

 xi 



o 30 

 o 

 o 

 -'20 



10 







400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg. R ( 1 Hn at Temp.) 



Chart 124. — The effect of annealing on the yield strength of deep- 

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

 reduction of area) from a grain size of 0.100 mm. (68.41 % copper) 

 (0.040-in. stock). 



(J o 



110 



100 

 ; 90 

 "80 

 i" 70 



1 



60 

 50 

 40 

 30 

 20 

 10 



50 60 70 80 90 100 110 



Rockwell Hardness F-/ie"Ball 60 Kg. Load 



5 23 40 58 75 93 



Rockwell Hardness B 1^16" Ball 100 Kg. Load 

 57 63 68 74 80 85 91 



Rockwell Hardness l5T/i6Ban 15 kTg. Load 

 6 19 31 43 55 67 78 



Rockwell Hardness 30T yi6"BQll 30Kg.Load 



Chakt 125. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of deep-drawing 

 brass strip (68.41 % copper) when only Rockwell hardness is known. 

 It is accurate for all thicknesses between 0.020 and 0.080 in. within 

 the given limits. 



30 



40 



50 



Shear Strength, 1000 Lb. per Sq. In. 



Chart 126. — Conversion chart for determination of shear strength 

 of deep-drawing and spinning brass (68.00 % copper, balance zinc) 

 when tensile strength is known. Accurate to +5 %.'*^' 



