The Tin Bronzes 



281 



CR 400 500 600 700 800 900 1000 IIOO 1200 1300 

 Annealing Temp in Deq.F. (2Hra+ Temp.) 



Chart 42. — The effect of annealing on the tensile strength and 

 percentage elongation in 2 in. of a phosphor bronze (6.65 % tin, 0.12 % 

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

 tion of area) according to Cook and Tallis.''''^ 



240 



220 



200 



180 



160 



140 



120 



100 



80 



60 



40 



20 



CR 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.F.(2Hna+ Temp.) 



Chart 43. — The eflfect of annealing on the Erichsen ductility value 

 and hardness of a phosphor bronze (6.65 % tin, 0.12 % phosphorus, 

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

 according to Cook and Tallis.*"" 



TABLE 9 

 8 PER CENT PHOSPHOR BRONZE 



General Data" — Strip 

 Copper, 92.60%; tin, 7.31%; phosphorus, 0.02% 



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, p.s.i. (000 omitted) 



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



Rockwell hardness E, M-iii- 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 



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 



Hard" 



Soft= 



' Based on data by Cook and Tallis^o. 



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



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



