16 



Copper and Copper-base Alloys 



CR 500 600 700 800 QOO 1000 1100 1200 1300 1400 

 Annealing Temp, in Deg.F. fl Hr. at Temp) 



Chart 40. — The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of silver-bearing copper strip previously 

 cold-rolled 6 B. & S. N03. (50 per cent reduction of area) from two 

 different grain sizes, 0.015 and 0.035 mm. (99.95 % copper, 10 oz. of 

 silver per ton) (0.040-in. stock) . 



500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp.in Deg.F. (1 Hr. atTemp.) 



Chart 41. — The effect of annealing on the yield strength of silver- 

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

 reduction of area) from a grain size of 0.035 mm. (99.95 % copper. 

 10 oz. of silver per ton) (0.040-in. stock). 



60 



50 



.40 



a 30 



20 



500 600 700 800 900 1000 1100 1200 1300 1400 

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



Chart 42. — The effect of annealing on the yield strength of silver- 

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

 reduction of area) from a grain size of 0.015 mm. (99.95 % copper, 

 10 oz. of silver per ton) (0.040-in. stock). 



100 



30 40 50 60 70 80 90 



Rockwell Hardness F-|^'Ball 60Kg. Load 

 5 23 40 58 



Rockwell Hardness B-^^' Ball 100 Kg. Load 

 63 68 74 80 

 Rockwell Hardness 15-T-i^'Ball 15 Kg. Load 

 19 31 „ 43 55 ^ 



Rockwell Hardness SO-T-,^' Ball 30 Kg. Load 

 Chart 43. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of silver-bearing 

 copper strip (99.95 % copper, 10 oz. of silver per ton) when only 

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

 0.020 and 0.080 in. within the given limits. 



76 

 85 



67 



