The Tin Brasses 



171 



TABLE 12 

 MODIFIED MANGANESE BRONZE 



General Data — Strip" 

 Copper, 61.51%; tin, 0.47%; lead, 0.08%; iron, 0.10%; manganese, 0.05%; zinc, balance 



Property 



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



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



Elongation, % in. 2 iq 



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) 



Rockwell hardness F, J^g-iQ- ball, 60-kg. load 



Rockwell hardness B, He-in- ball, 100-kg. load 



Rockwell hardness G, J^g-ii- ball, 150-kg. load 



Rockwell hardness 15-T, ^^e-in- ball, 15-kg. load 



Rockwell hardness 30-T, He-in. ball, 30-kg. load 



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



Melting point, °F , • ■ - 



Density, lb. per cu. in 



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 



' All tests conducted on 0.040-in. stock. 



!• 6 B. & S. Noa., 0.080-0.015 mm. grain size at ready-to-finish. 



" 1300*F. anneal (1 hr. at temperature) of material described in footnote a. 



Hard'' 



96-102 

 69-75 



3-4 

 69-71 

 85-88 

 74-77 

 111-112 

 94^95 

 73-74 

 91-92 

 79 



Soft= 



58 

 15-17 

 33-40 

 19-22 

 19-22 

 19-22 



80 

 44-46 



75-76 

 46-47 



15,000,000 

 1645 

 0.304 



0.0000214 

 24.9 



no 



100 



90 



80 



£ 70 



Z 60 



V 



^30 



_i 



S 40 



11.0 20.7 294 37.2 44.0 50.0 55.5 60.5 64.8 68.6 

 Percenf Reducfion of Area by Rolling 

 01 2345 6789 10 

 BS-S Numbers Hard 

 Chart 115. — The effect of cold rolling on the tensile strength and 

 apparent elastic limit of modified manganese-bronze strip, previously 

 annealed to two different grain sizes, 0.015 mm. and 0.080 mm. (61.51 % 

 copper, 0.47 % tin, 0.15 % iron and manganese, balance zinc) (0.040-in 

 stock). 



110 



100 



90 



80 



70 



c 



tD 60 



50 



^40 

 "a 



o 30 



^ 20 

 $ 



u 10 

 o 



■^ 



II.O 20.7 29.4 372 44.0 50.0 55.5 60.5 64.8 68.6 

 Percenf Reduction of Area by Rolling 

 01 2 3456789 10 

 B&S Numbers Hard 

 Chart 116. — The effect of cold rolling on the Rockwell hardness 

 and percentage elongation in 2 in. of modified manganese-bronze strip, 

 previously annealed to two different grain sizes, 0.015 and 0.080 mm. 

 (61.51 % copper, 0.47 % tin, 0.15 % iron and manganese, balance zinc) 

 (0.040-in. stock). 



