The Tin Brasses 



147 



90 

 80 



70 



_c 



c- 60 

 to 



«3 50 



:3 40 



o 

 §.30 



20 



10 



400 500 600 700 800 900 1000 1100 1200 1300 

 Annealing Temp.in Deg. E (l Hr. ci-1- Temp.) 



Chart 41. — The effect of annealing on the yield strength of admir- 

 alty-metal strip, previously cold-rolled 6 B. & S. Nos. (50 per cent 

 reduction of area) from a grain size of 0.080 mm. (70.37 % copper, 

 1.01 % tin, balance zinc) (0.040-in. stock). 



120 



no 



100 

 - 90 



CM <U 



— M 



4- _1 



Sg 



O o 



! ■" 



<U C 



50 



C+: 40 



L 



_o w 



UJ 



30 



20 



« 10 



57 



et 



10 20 30 40 50 60 70 80 90 100 



Rockwell Hardness B'/6"Boill 100 Kg. Load 



63 69 74 80 86 91 97 - - - 

 Rockwell Hardness F '/i6"Ball 60 Kg. Load 



64 67 71 74 77 80 84 87 90 93 

 Rockwell Hardness I5T Vie Ball 15 Kg. Load 



15 22 29 36 43 50 57 64 70 76 82 



Rockwell Hardness 30T '/i6"Ball 30Kg.Load 



Chart 42. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of admiralty-metal 

 strip (70.37 % copper, 1.01 % 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. 



0.002 0.004 0.006 0.008 

 Strain, Inches per Inch 



0.010 



Chart 43. — The effect of cold rolling on the stress-strain character- 

 istics of admiralty-metal strip (0.040 in. thick) having a ready-to- 

 finish grain size of 0.015 mm.; 5,000-lb. capacity hydraulic testing 

 machine and Templin automatic extensometer accurate to 0.00001 in. 

 used. (70.37 % copper, 1.01 % tin, balance zinc.) 



0.002 0.004 0.006 0.008 0.010 



Strain, Inches per Inch 



Chart 44. — The effect of cold rolling on the stress-strain character- 

 istics of admiralty-metal strip (0.040 in. thick) having a ready-to-finish 

 grain size of 0.080 mm. ; S,000-lb. capacity hydraulic testing machine 

 and Templin automatic extensometer accurate to 0.00001 in. used. 

 (70.37 % copper, 1.01 % tin, balance zinc.) 



