The Leaded Brasses 



91 



greater detail the effect of cold woi-king and annealing 

 on the mechanical properties of this alloy. 



Red brass (forging) is used for the hot forging or 

 stamping of plumbing fixtures. Its color closely approxi- 

 mates the higher copper content copper-zinc alloy con- 



taining 85 per cent of copper and for that reason it is 

 known as "red " brass. Its physical and general mechan- 

 ical properties are given in Table 15 on page 129. More 

 detailed mechanical data are given in Charts 121 to 126 

 on pages 130 and 131 



TABLE 1 

 HARDWARE BRONZE 



General Data — Rod 

 Copper, 88.78%.; lead, 1.61%; zinc, balance 



Property 



Soffx 



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) 



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, % 



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



Rockwell hardness F, Jf s-in. ball, 60-kg. load 



Rockwell hardness B, Jf g ball, 100-kg. load 



Modulus of elasticity, p.s.i 



Melting point, °F 



Density, lb. per cu. in 



C!oefEcient of expansion, per °C. from 25-300°C 



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



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



"Refers to rod cold-drawn 37%; rod under 1 in. in diameter, ready-to-finish grain size, 0.050 

 ^ Refers to rod cold-drawn 37 % and annealed at 1300°F. for 1 hr. at temperature. 



62 

 50 

 59 

 61 

 55 

 15 

 60 

 18 

 96 

 64 



37 

 6 

 10 



50 

 70 

 12 

 50 



15,000,000 



1913 



0.318 

 0.0000182 



42.3 



104 



Ex+r 10 20 30 40 50 



Percent Reduction by Cold Working 



60 



Chakt 1. — The effect of cold drawing on the tensile strength and 

 apparent elastic limit of hardware-bronze rod, previously annealed to a 

 grain size of 0.050 mm. (88.78 % copper, 1.61 % lead, balance zinc) 

 (rod under 1 in. in diameter). 



Ex+r. 10 20 30 40 50 60 



Percent Reduction by Cold Working 



Chart 2. — The effect of cold drawing on the Rockwell hardness, 

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

 hardware-bronze rod, previously annealed to a grain size of 0.050 mm. 

 (88.78 % copper, 1.61 % lead, balance zinc) (rod under 1 in. in diam- 

 eter). 



