DIN EN 4552-2004 航空航天系列.耐热钢制37?球面管子接头.焊接端直螺纹接头.英制系列
Aerospace series - Pipe coupling, 37°, spherical, in heat resisting steel - Straight nipples, welded end - Inch series; German and English version EN 4552:2003
This standard specifies the characteristics of welded straight nipples for inch series pipe couplings, 37? spherial, in heat resisting steel, for aerospace applications. Nominal pressure Class D in accordance with ISO 6771#,,#