. The Bell System technical journal . 0 0 0 46,90061,20075,15085,70093,90097,450 47,00062,50073,60083,95091,90097,350 46,35061,25072,80084,90094, 53 51 — — Note.—Tensile strength and percentage elongation are an average of 3 specimensin each case; Rockwell hardness values are an average of 15 determinations of 5readings on each of 3 tension test specimens. 788 BELL SYSTEM T
. The Bell System technical journal . 0 0 0 46,90061,20075,15085,70093,90097,450 47,00062,50073,60083,95091,90097,350 46,35061,25072,80084,90094, 53 51 — — Note.—Tensile strength and percentage elongation are an average of 3 specimensin each case; Rockwell hardness values are an average of 15 determinations of 5readings on each of 3 tension test specimens. 788 BELL SYSTEM TECHNICAL JOURNAL Phosphor Bronze: Two grades of phosphor bronze have been investigated, designatedalloys A and C, containing 4 and 8 per cent of tin, respectively. Alloy A Phosphor-Bronze Sheet.—Three rolling series representativeof the entire number investigated were made from the bar of metalof the analysis shown in Table VII. These three series were rolledto all even numbers hard from 2 to 10, B. & S. gage for Nos. 14,. -12 50,000 60,000 70,000 80,000 90,000 100,000TENSILE 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. TheRockwell hardness-tensile strength relationship for alloy A is givenin Fig. 15 and the tensile strength-reduction relationship is shownin Fig. 16. The Rockwell hardness and tensile strength limits foralloy A are given in Table XV and the chemical composition require-ments are given in Table VI. SHEET NON-FERROUS METALS 789 Alloy C Phosphor-Bronze Sheet.—The alloy C rolling series weremade from five bars of metal having the average composition shownin Table VII. This material was rolled to all even hardness numbersfrom 2 to 10 numbers hard, for all even B. & S. gage numbers from 110,000 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,00020,000 -v^ .^ / / DASHED LINESSHOW TENSILELIMITS y. ># / .^
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