The Tin Bronzes 



277 



TABLE 6 

 4 PER CENT PHOSPHOR BRONZE 



General Data" — Strip 

 Copper, 96.167o; tin, 3.71%; phosphorus, 0.12% 



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, Yi s-in. ball, 100-kg. load 



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



Diamond pyramid, 10-kg. load 



Erichsen value, mm 



Brinell hardness 



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 



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. at 68^F 



= Based on data by Cook and Tallis'". 



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



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



Hard" 



110 



182 



170 



54 



34 



^.919 



Soft' 



36 

 52 



72 

 13.4 



8.916 



0.322 



17.6 

 18.4 

 18.8 

 19.4 



48.40 

 62.92 

 0.0016 

 9.17 

 14,500,000 

 18.8 



120 



no 



Cr, 100 



i- 



°: 90 



V 



/ 



7 



^ 



Ulfimaie tensile strength^ 



1 — \ — h 



0./0%) proof s-treng-f-h 



^O 



y/ 



\ 



/ 



^ 



^ 



9 



vr 



y 



^- 



y^'y 



/ 



yU 



.< 



y 



^-^y 



^ 



-V 



y 



^^ 



Li'mif of proporiionaliiy 



\ Elongai-. 



240 

 220 

 200 

 180 



<o 160 

 I 140 



V> 120 



I 100 

 o 

 ^ 80 



60 



40 



20 







/- 



/- 



/ 



//^ 



y? 



y- 



Diamond pyramid 



A 



. -yt y^LBrinell, 10 Kg., I Mm. . 



>y 



y 



/ 





y^ 



X" 



Pock we//, /OOKg., ^ "ba/1. 



l?ockweI 





-Sa'^^PtY 



■ 5. S'S. 3 /lore sc/eroscope^ U.H.- 

 '■ se/f recorder I j I 



10 20 30 40 50 60 70 80 90 100 

 Percent Reduction in Area by Cold Working 



Chart 32. — The effect of cold rolling on the tensile strength, proof 

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

 phosphor bronze (3.71% tin, 0.12% phosphorus, balance copper), 

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

 Tallis.ts"' 



10 20 30 40 50 60 70 80 90 100 

 Percent Reduc+ion in Area by Cold Working 



Chaet 33. — The effect of cold rolling on the hardness of a phosphor 

 bronze (3.71% tin, 0.12% phosphorus, balance copper), previously 

 annealed for 2 hr. at 1150°F. according to Cook and Tallis.'^"' 



