The Aluminum Bronzes 



263 



50 100 150 200 250 300 350 400 4 BO 500 

 Temperci+ure Deg. R (1 Hr.oi+ Temp.) 

 Chart 27. — Effect of elevated temperature on the thermal con- 

 ductivity of 10 per cent aluminum bronze according to Griffitha 

 and Schoeaeld.<23) 



2.0 4.0 6.0 8.0 10.0 12.0 14.0 

 Addition +o Copper Percent 



Chabt 28. — The effect of aluminum additions on the thermal 

 conductivity of copper, previously annealed at 930°F. according to 

 Hanson and Rogers. '■■' 



TABLE 4 

 SILICON-ALUMINUM BRONZE ROD 



General Data 

 Copper, 90.72%; silicon, 2.03%; aluminum, balance 



Properties 



Rod 



Hard" Soft' 



Forgings 



Hot 



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



Apparent elastic limit, p.s.i. (000 omitted) 



Yield strength: 



0.5% extension, p.s.i. (000 omitted) 



0.2% offset, p.s.i. (000 omitted) 



0.1 % offset, p.s.i. (000 omitted) 



Elongation, % in 2 in " 



Reduction of area, % 



Rockwell hardness B, Ke-in. ball, 60-kg. load 



Brinell hardness, 10-mm. ball, 500-kg. load 



Modulus of elasticity, p.s.i 



Melting point, °F 



Density, lb. per cu. in 



Specific gravity 



Electrical conductivity, % I.A.C.S., 68°F 



Electrical resistivity, ohms per mil.-ft. per °F 



Thermal conductivity, B.t.u. per sq. ft. per ft. per hr. per °F., 

 Coefficient of linear expansion, per °F 



95 

 51 



54 

 63 

 51 

 25 

 37 

 84 

 140 

 14,000,000 

 1810 

 0.278 

 7.69 

 7 



148 



22 



0.0000092 



33 

 32 

 29 

 38 



40 



78 



126 



78-88 

 21-30 



31-43 

 29-44 

 26-40 

 42-33 

 43-37 

 74-86 

 118-140 



» Refers to rod cold-drawn 10.5% from i 

 ' Refers to a 1400°F. anneal (1 hr.). 



struded condition; rod under 1 i 



L diameter, ready-to-finish grain size 0.035 i 



