SHEET NON-FERROUS METALS 



799 



limits shown as points for high-brass sheet. The agreement is close. 

 Figures 24, 25, and 26 show similar smooth curves of experience 

 data for nickel silver and phosphor bronze. In these latter cases the 

 experience data are not sufficiently complete to verify the specification 

 limits in all tempers, but in general the accuracy of the specification 

 limits is verified. 



80 



70 



60 



50 



40 



30 



< 20 



10 



NOTE :- AMOUNT OF EXPERIENCE 

 DATA LIMITED. 



UPPER CURVE — AVERAGE EXPERIENCE 

 ON MATERIAL 0.040" 

 AND OVER THICK. 



LOWER CURVE -AVERAGE EXPERIENCE 

 ON MATERIAL LESS 

 THAN 0.040" THICK. 



60,000 



70,000 80,000 90,000 100,000 

 TENSILE STRENGTH — PSI 



110,000 120,000 



Fig. 25 — ^Comparison of Curves of Results from Experience Data with Limits 

 Adopted, for Alloy A Pho&phor-Bronze Sheet. 



In addition to the data, the experience of mills supplying material 

 indicates that the limits proposed are satisfactory. Instances where 

 the limits were not met served only to emphasize the advantages of 

 control of the physical properties. Variations from the nominal 

 annealing temperature, composition or percentage reduction in all 

 cases explained the variations from the specification limits. 



