The Tin Brasses 



173 



§110 



'Pioo 

 -a 



o 90 



&> 



^ 80 

 o 

 >o 



li- 70 



m 60 

 -to 



^ 50 



Q) 40 



30 



= 20 



0) 



Q: 



10 -^;;;: 



CR 



400 500 60O 700 800 900 1000 IIOO 1200 1300 

 Annealing Temp, in Deg.F ( 1 Hn a+ Temp.) 



Chart 121. — The effect of annealing on the Rockwell hardness and 

 percentage elongation in 2 in. of modified manganese-bronze strip, 

 previously cold-rolled 6 B. & S. Nos. (50 per cent reduction of area) 

 from two different grain sizes, 0.015 and 0.080 mm. (61.51 % copper, 

 0.47 % tin, 0.15 % iron and manganese, balance zinc) (0.040-in. stock). 



60 



400 500 600 700 800 900 1000 1100 1200 1300 

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



Chart 123. — -The effect of annealing on the yield strength of modi- 

 fied manganese-bronze strip, previously cold-rolled 6 B. & S. Nos. 

 (50 per cent reduction of area) from a grain size of 0.080 mm. (61.51 % 

 copper, 0.47 % tin, 0.15 % iron and manganese, balance zinc) (0.040-in. 

 stock) . 



400 500 600 700 800 900 1000 1100 1200 IJOO 

 Annealing Temp, in Deq. f\ ( 1 Hr a+ Temp.) 



Chart 122. — The effect of annealing on the yield strength of modi- 

 fied manganese-bronze strip, previously cold-rolled 6 B. & S. Nos. 

 (50 per cent reduction of area) from a grain size of 0.015 mm. (61.51 % 

 copper, 0.47 % tin, 0.15 % iron and manganese, balance zinc) (0.040-in. 

 stock) . 



^ 110 



100 



90 



.9 ^° 

 ■+■ 



° 70 

 S. 60 

 B 50 



cr 



t 40 



a. 



^ 30 

 o 

 § 20 



t^ 40 50 60 70 80 90 100 



_a) Rockwell Hardness B /le" Ball 100 Kg. Load 



•Si 80 86 91 97 - 



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



>- 74 77 80 84 87 90 93 



Pockwell Hardness 15 T /i6 Boll 15 kg. Load 

 43 50 57 64 70 76 82 



Rockwell Hardness 301 /le Ball 30 Kg. Load 



Chart 124. — This chart can be employed to determine the approxi- 

 mate tensUe strength and percentage elongation of modified man- 

 ganese-bronze strip (61.51% copper, 0.47% tin, 0.15% iron and 

 manganese, balance zinc) when only Rockwell hardness is known. It 

 is accurate for all thicknesses between 0.020 and 0.080 in. within the 

 given limits. 



