240 



Copper and Copper-base Alloys 



TABLE 2 

 SILICON BRONZE— TYPE A 



General Data — Rod 

 Silicon, 3%; manganese, 0.5-1.0%; copper, balance 



Property 



Hard" Soft'' 



Forgings 



Hot Cold" 



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



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



Elongation, % in 2 in 



Reduction of area, % 



Endurance limit, p.s.i. (000 omitted) 



Rockwell hardness F, }-i6-in. ball, 60-kg. load. 

 Rockwell hardness B, Jle-m- ball, 100-kg. load 



Modulus of elasticity, p.s.i 



Melting point, 'F 



Forging range, °F 



Forging quality 



Type structure 



Densitj-, lb. per cu. in 



110 



94 



5 



45 



30 



112 



62 

 21 

 72 

 75 

 18 

 81 

 45 



60-70 

 20-35 

 65-75 

 55-75 



80-95 

 35-60 



68 

 35 

 60 

 64 



70 



15,000,000 



1860 

 1250-1450 



Good 

 Single phase, alpha 



0.308 



General Data — Strip 

 SiUcon, 3.19%; tin, 0.46%; copper, balance 



Property 



Hard'' 



Soft' 



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



Elongation, % in 2 in.-'' 



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

 Rockwell hardness F, Jie-in. ball, 60-kg. load-'. 

 Endurance limit at 10' reversals: '^'*' 



Soft, p.s.i. (000 omitted) 



4 B. & S. Nos., hard, p.s.i. (000 omitted). . . . 



8 B. & S. Nos., hard, p.s.i. (000 omitted). . . . 



Young's modulus of elasticity, p.s.i 



Melting point, °F 



107-119 



5 



94-104 



111-116 



62-73 

 22-47 

 22-38 

 87-98 



16 



23 



25 



15,000,000 



1860 



Physical Data 



Coefficient of expansion, per °C. from 25-300°C . 0000180 



Thermal conductivity, B.t.u. per sq. ft. per ft. per hr. per °F., 68°F 27 



Electrical conductivity, % I.A.C.S., 68''F .' 8.1 



Density, lb. per cu. in 0.308 



Available Cheep Data"' 

 Previous history : (I) Cold-drawn 0.750-in. round bar; annealed 842°F. ; Brinell hardness, 1 19; tensile strength, 70,300 p.s.i. ; 

 % elongation in 2 in., 52; % reduction of area, 46. (II) Fully annealed. 



Temperature °F. 



Stress, p.s.i. required to produce designated rate of creep per 1,000 hr. 



0.01% 



0.10% 



L diamete 



ady-to-finish grain size of 0.080-0.100 i 



<* Refers to rod cold-drawn 50 % ; rod under 



& Refers to 1300°F. anneal (for 1 hr.). 



" Material cold-struck from forged condition. 



d 6 B. & S. Nos., hard, 0.015-0.080 mm. grain size at ready-to-finish, respectively. 



< Refers to 67% cold-rolled sheet, 900 and 1300°F. anneal which leaves 0.015 and 0.080 i 



^ Apply to strip only (all tests conducted on 0.040-in. stock). 



. grain size, respectively. 



