The Tin Brasses 



143 



no 



100 

 90 



UJ c 



10 20 30 40 50 60 70 80 90 100 



Rockwell Hardness B Vie" Ball 100 Kg.Looiol 

 57 63 69 74 80 86 91 97 - - - 



Rockwell Hardness F '/i6"Boill 60 Kg. Locsid 

 61 64 67 71 74 77 80 84 87 90 93 



Rockwell Hardne«s l5T'/ie"Ball l5Kg. Load 

 15 22 29 36 43 50 67 64 70 76 82 



Rockwell Hardness 30T He" Bod I 30Kg.Load 



Chart 30. — This chart caa be employed to determine the approxi- 

 mate tensUe strength and percentage elongation of pen-metal strip 

 (83.32 % copper, 1.32 % tin, balance zinc) when only Rockwell hardness 

 is known. It is accurate for all thicknesses between 0.020 and 0.080 in. 

 vrithin the given limits. 



100 

 .90 



1.70 



:36o 



o 



§50 



0.002 O.004 0.006 0.008 0.010 



S+roiin, Inches per Inch 



Chart 31. — The effect of cold rolling on the stress-strain character- 

 istics of pen-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. 

 (83.32 % copper, 1.32 % tin, balance zinc.) 



0.002 0.004 0.006 0.008 



S+rain, Inches per Inch 



0.010 



Chart 32. — The effect of cold rolling on the stress-strain characteristics of pen-metal 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 extensometer accurate to 0.00001 in. used. (83.32 % 

 copper, 1.32 % tin, balance zinc.) 



