Powder-in-tube (PIT) processed niobium–tin wires are commercially manufactured for nearly three decades and have demonstrated a combination of very high current density (presently up to 2500 A mm−2 non-Cu at 12 T and 4.2 K) with fine (35 μm), well separated filaments. We review the developments that have led to the present state of the art PIT niobium–tin wires, discuss the wire manufacturing and A15 formation processes, and describe typical superconducting performance in relation to magnetic field and strain. We further highlight successful applications of PIT wires and conclude with an outlook on possibilities for further improvements in the performance of PIT niobium–tin wires.
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机译：管中粉末（PIT）处理的铌锡线已商业化生产了近三十年，并已证明具有很高的电流密度（目前在12 T和4.2 K时高达2500 A mm-2非铜）的组合。细（35μm），细丝分开。我们回顾了导致PIT铌锡线的现状的发展，讨论了线材的制造和A15的形成过程，并描述了与磁场和应变有关的典型超导性能。我们将进一步重点介绍PIT焊丝的成功应用，并总结出进一步改善PIT铌锡焊丝性能的可能性。
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