774 



BELL SYSTEM TECHNICAL JOURNAL 



high-brass rolHng series, and also with the data shown on Fig. 19 for 

 commercial shipments of high and clock brass. 



The composition of alloy E brass is midway between that of high 

 and clock-brass, and consequently it was to be expected that the 

 Rockwell hardness limits for this material would be the same as for 



90 



.80 



■70 



P60 



!50 



-l!?40 

 I 



i30 



120 



40 



50 60 70 80 90 



ULTIMATE TENSILE STRENGTH-PS I X 10^ 



Fig. 7 — Relation of Rockwell Hardness to Tensile Strength of Alloy E Brass. 



the foregoing. The tension test is more sensitive to such changes in 

 chemical composition and since it is the test upon which acceptance 

 or rejection of material is based, separate tensile strength limits are 

 given. The separate tensile strength and the combined Rockwel 

 hardness limits for these alloys are given in Table V. The physical 

 properties of alloy E brass are given in Table VIII. 



