The Leaded Brasses 



127 



TABLE 14 

 ARCHITECTURAL BRONZE- 



Copper, 56.6.4%; lead, 1.91%; zinc, balance; iron, 0.05% 



Property 



Rod 



Hard* Soft' 



Forgings 



Hot 



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



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



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



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



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



Elongation, % in 2 in 



Reduction of area, % 



Rockwell hardness F, J-fs-in- ball, 60-kg. load 



Rockwell hardness B, 10-mm. ball, 100-kg. load. . . . 



Modulus of elasticity, p.s.i 



Melting point, °F 



Density, lb. per cu. in 



Forging range, °F 



Forging quality 



Type structure 



63 



25 



35 



35 



33 



25 



35 



93 



63 

 15,000,000 



1625 



0.305 



1250-1350 



Excellent 



Two phase, alpha-beta 



51 

 58 

 68 

 59 

 15 

 25 

 105 



68-75 

 14-22 

 21-33 

 19-32 

 17-29 

 35-25 

 35-25 

 88-92 

 51-64 



« This alloy combines excellent hot-forging properties with good machinabihty. 



^ Refers to rod cold-drawn 18% from the extruded condition; rod under 1 in. in diameter with : 



* Refers to extruded condition. 



eady-to-finish grain size, 0.025 : 



100 

 90 

 80 

 70 

 ■^60 



cr 



oo 



i.50 



<u 



Q. 



§30 

 20 



Ex+r. 10 20 



Percent Reduction by Cold Working 



30 



Chart 114. — The effect of cold drawing on the tensile strength and 

 apparent-elastic limit of architectural-bronze rod, previously extruded 

 to a grain size of 0.025 mm. (56.64 % copper, 1.91 % lead, balance zinc) 

 (rod under 1 in. in diameter). 



110 



100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 



Ex+r. 10 20 30 



Percent Reduction by Cold Working 



Chart 115. — The effect of cold drawing on the Rockwell hardness, 

 percentage elongation in 2 in., and percentage reduction of area of 

 architectural-bronze rod, previously extruded to a grain size of 0.025 

 mm. (56.64 % copper, 1.91 % lead, balance zinc) (rod under 1 in. in 

 diameter) . 



