DIN EN 4549-2014 航空航天系列.耐热钢或耐热镍合金管连接件.焊接的连接件端.设计构造.英制系列;德文与英文版本EN 4549-2014
Aerospace series - Pipe coupling, in heat resisting steel or in heat resisting nickel alloy - Coupling end, welded - Design configuration - Inch series; German and English version EN 4549:2014