The Tin Brasses 



163 



o 110 

 o 



°3 100 



T> 



o 90 



g 80 

 in 



^'S 60 



S 50 



-§ 40 



u 

 a 

 ^ 30 



"oi 



J 20 



ji 

 o 



,5 10 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.R( IHna-h Temp.) 



Chart 91. — The effect of annealing on the Rockwell hardness, 

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

 low-lead naval brass rod, previously cold drawn 28 per cent (reduction 

 of area) from material having a grain size of 0.025 mm. (60.95 % 

 copper, 1.03 % tin, 0.39 % lead, balance zinc) (rod under 1 in. in 

 diameter) . 



CD 400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp, in Deg.E C IHr. at Temp.) 



Chart 92. — The effect of annealing on the yield strength of low- 

 lead naval brass rod, previously cold-drawn 28 per cent (reduction of 

 area) from material having a grain size of 0.025 mm. (60.95 % copper, 

 1.03 % tin, 0.39 % lead, balance zinc) (rod under 1 in. in diameter). 



TABLE 9 

 MEDIUM -LEADED NAVAL BRASS 



Copper, 60.95%; tin, 1.03%; lead, 0.72%; iron, 0.02%,; zinc, 



Property 



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, %in2in 



Reduction of area, % 



Rockwell hardness F, }>i(,-in. ball, 60-kg. load 



Rockwell hardness B, J-jg-in. ball, 100-kg. load 



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



Modulus of elasticity, p.s.i 



Melting point, °F 



Coefficient 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 



Density, lb. per cu. in 



Type structure 



Rod 



' Refers to rod cold-drawn 30 %; rod under 

 ^ Refers to 800 °F. anneal (1 hr.). 



I diameter, ready-to-finish grain size, 0.025 ] 



