280 



Copper and Copper-base Alloys 



TABLE 8 

 6.6 PER CENT PHOSPHOR BRONZE 



General Data" — Strip 

 Copper, 93.197c; tin, 6.65%; phosphorus, 0.12% 



Property 



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



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



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



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



Elongation, % in 2 in 



Rockwell hardness B, Jie-in. ball, 100-kg. load 



Rockwell hardness E, }i-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 gravity 



Density, lb. per cu. in 



Coefficient of thermal expansion, X10~^: 



At 20-100°C 



At 20-200°C 



At 20-300°C 



At20-400°C 



Thermal conductivity: 



At 70°r., 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., 68°F 



87 

 65 



11 



97 



112 



210 



196 



64 



37 



S.918 



Soft' 



82 

 14.6 



0.322 



17.2 

 17.9 

 18.3 

 18.9 



36.30 

 48.40 

 0.0023 

 12.83 

 14,500,000 

 13.6 



" Based on data by Cook and Tallis^''. 



fr Refers to strip cold-rolled 50% (ready-to-finish anneal 2 hr. at IISCF,). 



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



150 



120 



<N 60 



■t 50 



40 



30 



20 



~ 10 



Ulfjmafe fensile sirengih-^ y r 



H V 



0. 10 9b proof sfreng^h ^ 



Z^f 



4- 



-^ 



L 



y 



\^'- 



A 



I'-'K 



^ 



/ 



v^ 



/ 



/ 



-7^ 



/ 



X 



7 



A 



r- 



\ 



/ 



A 



/ 



7^ 



^ 



^ 



/ 



/ 



-^■ 



/ / 



^ 



y- 



.^ 



^' 



> 



y 



y^ Limif of propori'ionalih/ 



Elongafion 



280 



260 

 240 

 220 

 200 

 180 

 « 160 

 ^ 140 



£l20 



c 



I 100 

 80 

 60 

 40 



20 

 



^ 



y 



V 



/ 



Diamond pyramid 



/ 



7^ 



/ 



y- 



/ 



/ 



/ 



z. 



7^ 



-.^ 



/ 



A 



~7 



V- 



/ 



/ 



:^ 



A 



y 



y 



y 



/Brinell, 10 kg., 1mm. 



Rockwell, 100 kg., i" ball_ 



Rockwell, 100 kg., f ^' ball 



Shore scleroscope, M.H. 



i- i -hr • 



'S.S,S. Shore scleroscope U.H. 

 & self- recorder 



I I I 



10 20 30 40 50 60 70 80 90 

 Percent Reducfion in Area by Cold Working 

 Chabt 40. — The effect of cold rolling on the tensile strength, proof 

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

 phosphor bronze (6.65% tin, 0.12% phosphorus, balance copper), 

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

 TaUis.<"' 



10 20 30 40 50 60 70 80 90 

 Percent Reduction in Area by Cold Working 



Chart 41. — The effect of cold rolling on the hardness of a phosphor 

 bronze (6.65% tin, 0.12% phosphorus, balance copper), previously 

 annealed at IISO'F. for 2 hr. according to Cook and Tallis.<'"> 



