330 



Copper and Copper-base Alloys 



TABLE 12 

 RECOMMENDED RADU FOR FORMING 90-DEG. BENDS IN SHEET SILICON BRONZE (TYPE A) 



According to Golm'"'' 



TABLE 13 

 RECOMMENDED RADU FOR FORMING 90-DEG. BENDS IN COPPER-BERYLLIUM SHEET 



According to Gohn'^^' 

 Heated 1 hr. at 800°C. (1472°F.); quenched in water 



Condition 



Soft 



Cold-rolled, 2 B. & S. 

 Nos., hard, 21% re- 

 duction of area 



Cold-roUed, 4 B. & S. 

 Nos., hard, 37% re- 

 duction of area 



Tensile 

 strength, 

 p.s.i. (000 

 omitted) 



Rockwell 



Nominal thickness 



B. &S. 

 gage 



No. 



In. 



0.0403 

 0.0403 



Minimum suitable radius of punch, in. 



Bend perpendicular 

 to rolling 

 direction 



Sharp 

 Me 0.0625 



Bend 45 deg. to 

 rolling direction 



Sharp 

 %2 0.0937 



Bend parallel 

 to rolling 

 direction 



Sharp 



>14 



>0.250 



Copper-nickel Beryllium 



Soft annealed 



Cold-rolled, 1 B. & S. 

 No., hard, 10% re- 

 duction of area 



Cold-rolled, 2 B. & S. 

 Nos., hard, 21% re- 

 duction of area 



Cold-rolled, 1 B. & S. 

 No., hard, 10% re- 

 duction of area, aged 

 after rolling 



0.0159 

 0.0159 

 0.0403 



0.0159 



0.0156 

 0.0312 

 0.0937 



0.0312 



>Vi 



0.0156 

 0.0312 

 0.0625 



0.0312 



>^ 



0.0156 

 0.0312 

 0.125 



0.0312 



>0.250 



