82 



Copper and Copper-base Alloys 



80 



70 



60 



50 



D-40 



a 5° 

 o 



2-20 

 10 



500 600 700 800 900 1000 1100 1200 1300 1400 

 Annealing Temp in Deg.F. ( IHr a+ Temp.) 



Chart 167. — The effect of annealing on the yield strength of Muntz 

 metal strip, previously cold-rolled 6 B. & S. Nos. (50 per cent reduction 

 of area) from a grain size of 0.045 mm. (60.50 % copper) (0.040-in. 

 stock) . 



60 65 70 75 80 65 90 95 100 105 110 



Rockwell Hardness F-'/i6"Ban 60 Kg. Load 

 5 14 23 32 40 49 58 67 75 



Rockwell Hardness 8-1^16" Ball 100 Kg. Load 

 63 65 68 71 74 76 80 82 85 



Rockwell Hardness l5T-'/i6"Ball 15 Kq. Load 

 19 25 31 38 43 49 55 61 6T 



Rockwell Hardness 30 T- l/ie" Ball 30Kg.Load 



Chart 168. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of Muntz metal strip 

 (60.50 % copper) when only Rockwell hardness is known. It is accu- 

 rate for all thicknesses between 0.020 and 0.080 in. within the given 

 limits. 



0.002 0.004 0.006 0.008 

 Strain^ Inches per In. 



0.010 



Chart 169. — The effect of cold rolling on the stress-strain charac- 

 teristics of Muntz metal strip (0.040 in. thick) having a ready-to-finish 

 grain size of 0.015 mm. (60.50 % copper) ; 5,000-lb. capacity hydraulic 

 testing machine and Templin automatic extensometer accurate to 

 0.00001 in. used. 



90 



80 



£ 70 

 & 



I/O 



u 60 



u 



o. 



^ 50 



o 

 §40 



(o- 30 



-t 20 



10 



0.002 0.004 Q006 0.008 

 S+rain, Inches per In. 



0.010 



Chart 170. — The effect of cold rolling on the stress-strain charac- 

 teristics of Muntz metal strip (0.040 in. thick) having a ready-to- 

 finish grain size of 0.045 mm. (60.50 % copper) ; 5,000-lb. capacity 

 hydraulic testing machine and Templin automatic extensometer 

 accurate to 0.00001 in. used. 



