The Tin Brasses 



155 



100 



. 90 



c 



o- 80 

 «/) 



^ 70 

 ^ 60 

 I 50 

 40 

 SO 

 20 

 10 



400 500 600 700 800 90O lOGO 1100 1200 1500 

 Annealing Temp, in Deg. F. (I Hr. at Temp.) 



Chart 64. — The effect of annealing on the yield strength of Govern- 

 ment naval-brass strip, previously cold-rolled 6 B. & S. Nos. (50 per 

 cent reduction of area) from a grain size of O.OSO mm. (61'.51 % copper, 

 0.57 % tin, balance zinc) (0.040-in. stock) . 



100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 

 10 



40 50 60 - 70 80 <)0 100 



Rockwell Hardness B '/is" Ball 100 Kg. Load 

 80 86 91 97 - 



Rockwell Hardness F '/le" Ball 60 Kg. Load 

 74 77 80 84 87 90 93 



Rockwell Hardness 15-T i/i6"Ball ISKg.Load 

 45 50 57 64 70 76 82 



Rockwell Hardness 30^TVj6"Ball SOKg.Load 



Chart 65. — This chart can be employed to determine the approxi- 

 mate tensile strength and percentage elongation of Government naval- 

 brass strip (61.51 % copper, 0.57 % tin, balance zinc) when only Rock- 

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

 0.020 and O.OSO in. within the given limits. 



100 

 90 

 80 

 ■ 70 

 60 

 50 

 40 

 30 

 20 

 10 



0.010 



0.002 0.004 0.006 0.008 



Strain, Inches per In. 



Chart 66. — The effect of cold rolling on the stress-strain character- 

 istics of Government naval-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. (61.51 % copper, 0.57 % tin, balance zinc.) 







0.010 



0.002 0.004 Q006 Q008 

 Strain^ Inches per In. 



Chart 67. — The effect of cold rolling on the stress-strain character- 

 istics of Government naval-brass 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. (61.51 % copper, 0.57 % tin, balance zinc.) 



