Importance

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Abstract

A phosphor bronze strip having excellent bending workability and high mechanical strength for use in electronic parts such as terminal connectors wherein; the phosphor bronze strip has a stripe in a cross sectional microstructure revealed by etching; the difference of the maximum and the minimum of tin concentration in the region containing the stripe is between 5 and 40 mass %, preferably 5 to 25 mass % of that of a base material; and the strip is manufactured by the steps of cold rolling to a reduction ratio of at least 45%, final recrystalization annealing to the extent that the mean grain size (mGS) is from 0.5 to 2 .mu.m and the standard deviation of the grain size (.sigma.GS) is not more than 1.5 .mu.m, and final cold rolling to a reduction ratio of 20 to 70%.

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First Claim