788 



BELL SYSTEM TECHNICAL JOURNAL 



Phosphor Bronze: 



Two grades of phosphor bronze have been investigated, designated 

 alloys A and C, containing 4 and 8 per cent of tin, respectively. 



Alloy A Phosphor-Bronze Sheet. — Three rolling series representative 

 of the entire number investigated were made from the bar of metal 

 of the analysis shown in Table VII. These three series were rolled 

 to all even numbers hard from 2 to 10, B. & S. gage for Nos. 14, 



-12 



50,000 



60,000 70,000 80,000 90,000 100,000 

 TENSILE STRENGTH — PS I 



10,000 120,000 



Fig. 15 — -Relation of Rockwell Hardness to Tensile Strength of Alloy A Phosphor- 

 Bronze Rolling Series. 



20 and 28. The physical properties are given in Table XIV. The 

 Rockwell hardness-tensile strength relationship for alloy A is given 

 in Fig. 15 and the tensile strength-reduction relationship is shown 

 in Fig. 16. The Rockwell hardness and tensile strength limits for 

 alloy A are given in Table XV and the chemical composition require- 

 ments are given in Table VI. 



