The Tin Bronzes 



283 



TABLE 10 

 8 PER CENT PHOSPHOR BRONZE 



General Data" — Strip 

 Copper, 92.207o; tin, 7.41%; phosphorus, 0.38% 



Property 



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



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



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



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



Elongation, % in 2 in 



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



Rockwell hardness E, J^-in. ball, 100-kg. load 



Diamond pyramid, 10-kg. load 



Erichsen value, mm 



Brinell hardness 



Shore Soleroscope, M. H 



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



Specific gravity 



Density, lb. per cu. in 



Coefficient of thermal expansion, X10~': 



At20-100°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., 68°F 



109 

 96 



71.5 



11 

 98 

 112 



228 



203 



72 



41 



8.887 



Soft<^ 



62 



93 



13.1 



8.885 



0.321 



17.4 

 18.3 

 19.0 



26.62 

 36.30 

 0.0026 

 17.64 

 14,500,000 

 9.7 



^ Baaed on data by Cook and Tallis^o. 



t" Refers to strip cold-rolled 50 % (ready-to-fin 



« Refers to il50°r. anneal 2 hr. at temperatu: 



sh anneal 2 hr. at 1160°F.). 



150 



(40 



130 



. 120 



ri-llO 



is 100 

 a. 



5 90 

 o 

 8 80 



c: 70 

 "c 50 



(U 



o 

 ii 40 



CL. 



|-30 



I20 

 c 

 o 10 



U/Hmafe tensile sfreng-f-h-^y 



^^ 



-\ \ \ \ \ 



0./07o proof sirengfh^ 



X.^ 



J-A 



1/ 



T 



^'^ 



V 



-^- 



A 



^\ 



/ 



.^ 



T 



/ 



/ 



^^ 



\ 



/ / 



-^ 



-^ 



Z. 



^^ 



7^ 



/ 



/ 



\^ 



^ 



y 



y- 



-y 



/ / 



ji^: 



/ 



y- 



v^ 



^ 



/^ 



/ 



Limif of proporfiona/r'-f-y 



\ 



Elongaffon 



\. 



280 



260 



240 



220 



200 



180 



I 160 



> 140 



I 120 



D 100 



so 



60 

 40 

 20 



4/ 



IL 



^ 



/ 



^' 



Diamond pyramid 



^^ 



// 



7^ 



X 



7^ 



A > 



/ 



.^ 



^'- 



y 



/ y> ^Brinell. IOI<g., Imrn. 



Rockwell^ iOO /(q., g ball 



■^ckwell 100 kg. i ^^. 



^ Shore scieroscopBj i4.H. . 



.i l-l'H I 



S.SiS. Shore scleroscope, U.H. 

 - S self recorder 



10 20 30 40 50 60 70 80 90 

 Percent Reduction in Area by Cold Working 



Chart 48. — The effect of cold rolling on the tensile strength, proof 

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

 phosphor bronze (7.41% tin, 0.38% phosphorus, balance copper), 

 previously annealed at 1150°F. for 2 hr. according to Coo'- and 

 TaUis.('»> 



10 20 30 40 SO 60 70 80 90 

 Percent Reduction in Area by Cold Working 



Chart 49. — The effect of cold rolling on the hardness of a phosphor 

 bronze (7.41% tin, 0.38% phosphorus, balance copper), previously 

 annealed at H50°F. for 2 hr. according to Cook and Tallis.''* 



