The Special Brasses 



185 



120 



no 



£ 100 



a* 



u 

 w 



Q- 80 

 ji 



o^O 

 o 

 2 60 



c 

 X 50 



^40 

 55 30 



I 20 



c 



L^ 10 



10 20 30 40 50 60 70 80 90 100 



Rockwell Hardness B 'M' Ball 100 Kg. Load 

 57 63 69 74 80 86 91 97 



Rockwell Hardness F Vie Ball 60 Kg. Load 

 61 64 67 71 74 77 80 84 87 90 93 



Pockwell Hardness 15 T /i6"Bcall 15 Kg. Load 

 15 22 29 36 43 50 57 64 70 76 82 



Rockwell Hardness 30T yi6"Ball 30 Kg. Load 



Chart 25. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of silicon-brass 

 No. 2 strip (72.36 % copper, 0.47 % silicon, 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 

 S+roin^ Inches per In. 



0.010 



Chart 26. — The effect of cold rolling on the stress-strain character- 

 istics of sUicon-brass No. 2 strip (0.040 in. thick) having a ready-to- 

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

 machine and Templin automatic exteusometer accurate to 0.00001 in. 

 used. (72.36 % copper, 0.47 % silicon, balance zinc.) 



0.002 0.004 0.006 0008 

 5+rain^ Inches per In. 



0010 



Chart 27. — The effect of cold rolling on the stress-strain characteristics of silicon-brass No. 2 strip (0.040 in. thick) having a ready-to-finish 

 grain size of 0.080 mm. ; 5,000-lb. capacity hydraulic testing machine and Templin automatic exteusometer accurate to 0.00001 in. used. (72.36 % 

 copper, 0.47 % silicon, balance zinc.) 



