274 



Copper and Copper-base Alloys 



TABLE 4 

 3 PER CENT PHOSPHOR BRONZE 



General Data" — Strip 

 Copper, 96.50%; tin, 3.09%; phosphorus, 0.39% 



Property 



Tensile strength, p.s.i. (000 omitted) 



0.10% proof strength, p.s.i. (000 omitted) 



Limit of proportionaUty, p.s.i. (000 omitted) 



Shear strength, p.s.i. (000 omitted) 



Elongation, % in 2 in 



Rockwell hardness B, J-fe-in. ball, 100-kg. load 



Rockwell hardness E, H-in. ball, 100-kg. load 



Diamond pyramid, 10-kg. load 



Erichsen value, mm 



Brinell hardness, 10 kg., 1-mm. ball 



Shore Scleroscope, M. H 



S. & S., Shore Scleroscope, U. H., and self-recorder 



Specific gra-\dty 



Density lb. per cu. in 



Coefficient of thermal expansion, X10~*: 



At 20-100°C 



At 20-200°C 



At 20-300°C 



At 20-400°C 



Thermal conductivity : 



At 70°F., B.t.u. per sq. ft. per ft. per hr. per °F 



At 400°F., B.t.u. per sq. ft. per ft. per hr. per °F 



Temperature coefficient of thermal conductivity 



Specific resistance, ohm-cm. X 10"'' at 20°C 



Modulus of elasticity, p.s.i 



Electrical conductivity, % I.A.C.S 



" Based on data by Cook and Tallis^o. 



6 Refers to strip cold-roUed 50 % (ready-to-finish anneal 2 hr. at 1150°F.) 



" Refers to 1150°F, anneal 2 hr. at temperature. 



Hard" 



7 

 57 



109 

 190 



170 



58 

 34 



5.883 



Soft' 



47 



35.4 



58 



69 



12.8 



0.320 



16.6 

 17.5 

 18.2 

 18.8 



38.72 

 56.66 

 0.0024 

 12.23 

 14,500,000 

 14.1 



120 



- 110 

 & 



100 



80 



V70 



I'' 



t 50 

 u 

 (J 



\, 40 



g^20 



I 10 







10 20 30 40 50 60 70 80 90 

 Percent Reduction in Area by Cold Working 

 Chaht 24. — The effect of cold rolling on the tensile strength, proof 

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

 phosphor bronze (3.09% tin, 0.39% phosphorus, balance copper), 

 previously annealed H50°F. for 2 hr. according to Cook and 

 Tallis.'^o' 



240 

 220 

 200 

 180 

 160 

 140 



10 



(u 



?. 120 



> 



100 



80 



60 



40 



LC 



f 



20^ 

 



-7' 



Ml 



/t^ 



Diamond pyramid 



// 



y- 



7^^ 



/ 



y^ 



.y 



^^ 



y X ^ Brinell, 10 Kg., I Mm. 



Rockwell, 100 Kg., '/& "ball 



'^Rockwell, 100 Kg., l/ie'ball 



Shore scleroscope, M.H. 



— r 1 



. j; StS. Shore scleroscope, U.H.j 

 self recorder \ I 

 I I I I I I 



10 20 30 40 50 60 70 80 90 

 Percent Reduction in Area by Cold Working 

 Chart 25. — The effect of cold rolling on the hardness of a phosphor 

 bronze (3.09 % tin, 0.39 % phosphorus, balance copper), previously- 

 annealed for 2 hr. at 1150°F. according to Cook and TaUis.*"" 



