L303Wire&rod丝660-725Ag45Cu30Zn余Brazingofcopper,copperalloys,steelandstainlesssteeletc.钎焊铜及铜合金、钢及不锈钢等BAg-5L303FFluxcoatedrod涂药丝660-725Ag45Cu30ZnRem.L303coatedwithflux,thesameapplicationasL303.外涂钎剂的L303，用途与L303相同BAg-5L304Foil箔690-775Ag50Cu34ZnRem.Brazingofcopper,copperalloysandsteeletc.钎焊铜及铜合金、钢等BAg-6)