276 



Copper and Copper-base Alloys 



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90 



5 80 



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£ 60 



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Limii of proporiionalify 



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10 20 30 40 50 60 70 80 90 100 

 Percetrt- Reduction in Area by Cold Working 



CsABT 2S. — The effect of cold rolling on the tensile strength, proof 

 strength, proportional limit, and percentage elongation in 2 in. of a 

 phosphor bronze (3.11 % tin, 0.02 % phosphorus, balance copper), 

 previously annealed for 2 hr. at 1150°F. according to Cook and 

 Tallis.<'»> 



:?40 



220 

 200 

 180 

 ISO 

 140 

 120 

 100 

 80 

 60 

 40 



20 ^ 







t 



/- 





// 



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Diamond pyramid 



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: ^Brinell, 10 Kg., I mm. 



.11 

 Rockwell lOOKg.j '/s ball 



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-Rockwell, 100 Kg., '/i6 bal/- 



'Shore scleroscope,HH. 



■S.&Sy Shore scleroscope, U.H.- 

 E/ self-recorder I I 



10 20 30 40 50 60 70 80 90 100 

 Percent Reduction in Area by Cold Working 



Chart 29. — The effect of cold rolling on the hardness of a phosphor 

 bronze (3.11 % tin, 0.02 % phosphorus, balance copper) previously 

 annealed for 2 hr. at 1150°F. according to Cook and T allia Cao) 



100 



90 



80 



70 



60 



■q 20 



o 10 



CR 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.F:('2Hr at Temp.) 



CeU-KT 30. — The effect of annealing on the tensile strength and 

 percentage elongation in 2 in. of a phosphor bronze (3.11 % tin, 0.02 % 

 phosphorus, balance copper) , previously cold-roUed 60 per cent (reduc- 

 tion of area) according to Cook and T a.llia .t^o) 



200 



180 



160 



-c 140 



a 120 



u 



>^ 



^ 100 



80 



^ 60 



40 



20 







CR 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg-Hf^Hna+Temp.) 



Chart 31. — The effect of annealing on the Erichsen ductility value 

 and hardness of a phosphor bronze (3.11 % tin, 0.02 % phosphorus, 

 balance copper), previously cold-rolled 60 per cent (reduction of area) 

 according to Cook and Tallis.'^"^ 



