20 



Copper and Copper-base Alloys 



100 



90 



80 



70 



m 



60 



50 

 «/> 

 "40 



D 30 



^ 20 



^ in 



CR 400 500 600 700 800 QOO 1000 1100 1200 1300 

 Annealing Temp, in Deg. F. ("IHr. a+ Temp.) 



Chart 52. — The effect of annealing on the Rockrwell hardness and 

 percentage elongation in 2 in. of arsenical tough-pitch copper strip 

 previously cold-rolled 6 B. & S. Nos. (50 per cent reduction of area) 

 from two different grain sizes, 0.020 and 0.050 mm. (99.50 % copper, 

 0.45 % arsenic) (0.040-in. stock). 



CR 400 500 600 700 800 900 1000 IIOO 12001300 

 Annealing Temp, in Deg.F. (l Hr at TempJ 



Chart 53. — The effect of annealing on the yield strength of arsenical 

 tough-pitch copper strip previously cold-rolled 6 B. & S. Nos. (50 per 

 cent reduction of area) from a grain size of 0.020 mm. (99.50 % copper, 

 0.45 % arsenic) (0.040-in. stock). 



CR 400 500 600 700 800 900 1000 IIOO 1200 1300 

 Annealing Temp, in Deg.F. (IHr. at Temp.) 



Chart 54. — The effect of annealing on the yield strength of arsenical 

 tough-pitch copper strip previously cold-rolled 6 B. & S. Nos. (50 per 

 cent reduction of area) from a grain size of 0.050 mm. (99.50 % copper, 

 0.45 % arsenic) (0.040-in. stock). 



£ 60 

 & 



1 -^ 

 " o 



E 8 40 



u _-- 



i •£ 



- ^30 



- en 



?" '^ 20 

 5 ^ 

 J '(^ 



^ 10 







30 40 50 60 70 80 90 100 



Rockwell Hardness F-yi6"Ball 60 Kg. Load 



5 23 40 58 76 



Rockwell Hardness B- I/I6" Ball 100 kg. Load 



63 68 74 80 85 



Rockwell Hardness \5-T-'/i6"Ball- 15 Kg. Load 



19 31 44 55 67- 



Rockwell Hardness 30-T-/i6"Ball-30Kq.Locid 



Chart 55. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of arsenical tough- 

 pitch copper strip (99.50 % copper, 0.45 % arsenic) when only Rock- 

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

 and 0.080 in. tvithin the given limits. 



