| 摘要 |
The invention is predicated on the discovery that phosphor bronze strip may or may not have a thin coating of an oxide thereon which is formed during annealing of the strip. Coating, when present, substantially reduces die life when precision stamped and formed parts are being made from the strip. Coating is not detectable by previously known quality controls. Method is disclosed for determination of the presence or absence of the coating and, therefore, the suitability of a given lot of phosphor bronze strip for the manufacture of stamped and formed parts.
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