96 



% 70 



Q. 



:3 60 

 I 50 

 40 

 30 

 20 

 10 



500 600 700 800 900 1000 1100 1200 1500 1400 

 Annealing Temp, in Deg.F. (iHr a+ Temp.) 



Ch-^rt 16. — The effect of annealing on the yield strength of Lanca- 

 shire brass strip, previously cold-roUed 6 B. & S. Nos. (50 per cent 

 reduction of area) from a grain size of 0.065 mm. (73.53 % copper, 

 2.24% lead, balance zinc) (0.040-in. stock). 



Copper and Copper-base Alloys 

 no 



100 

 d 



% 80 



CL 



j5 70 



_i 



g 60 

 o 



£ 50 



o> 



C 40 



(U 



^ 30 

 B 20 



10 20 50 40 BO 60 70 80 90 100 



Rockwell Hardness B Vie" 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 



Rockwell Hardness 15-TVr6" Ball 15 Kg. Load 

 15 22 29 36 45 50 57 64 70 76 82 



Rockwell Hardness 30-T </i6 Ball SOKg.Load 



Chart 17. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of Lancashire brass 

 strip (73.53 % copper, 2.24 % lead, balance zinc) when only Rockwell 

 hardness is known. It is accurate for all thicknesses between 0.020 

 and 0.080 inches within the given limits. 



_c 90 



'^ao 



!-• 



g 60 



o_ 



■^- 50 

 w 

 <u 

 .^ 40 



30 



20 



10 







0.001 0.002 0.005 0004 0.005 0006 0.007 0008 

 Strain, Inches per Inch 

 Chart 18. — The effect of cold rolling on the stress-strain characteristics of Lancashire brass 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. (73.53 % 

 copper, 2.24 % lead, balance zinc.) 



