The Tin Brasses 



161 



100 



s:.. 90 



e 70 



60 



Cr, 50 



^40 



o 30 



o 



o 



-■^20 



W 10 



7^ 



40 



10.0 



50 60 70 80 90 



Pockwell Hardness B Vie Ball 100 Kg. Load 



86 91 97 - 



Rockwell Hardness F '/is" Boll 60 Kg. Load 



77 80 84 87 90 



Rockwell Hardness 15 T yie'Ball 15 Kg. Load 



50 57 64 70 76 



Rockwell Hardness 30T Vie" Ball 30 Kg. Load 



Chart 85. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of hard-naval-braaa 

 strip (61.50 % copper, 0.75 % tin, balance zinc) when only Rockwell 

 hardness is known. It is accurate for all thicknesses between 0.020 

 and 0.080 in. within the given limits. 



80 



74 



43 



93 



8Z 



40 41 42 43 44 45 



Shear S+reng+h_, 1000 Lb. per Sq.ln. 



Chart 86. — Conversion chart for determination of shear strength 

 of hard naval brass (61 % copper, 0.75 % tin, balance zinc) when 

 tensile strength is known. Accurate to +5 %.'*'' 



TABLE 8 

 NAVAL BRASS— LOW LEAD 



Copper, 60.95%; tin, 1.03%; lead, 0.39%; iron, 0.02%; zinc, balance 



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, % in 2 in 



Reduction of area, % 



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



Rockwell hardness B, j-f g-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 T., 68°F 



Density, lb. -per cu. in 



Forging range, °F 



Forging quality 



Type structure 



• Refers to rod cold-drawn 30%: rod under 1 in. in diameter, ready-to-finiah grain size, 0.025 



» Refers to 800°F. anneal (1 hr.). 



" Material cold-struck from forged condition. 



Rod 



Forgings 



