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17-4PH / 630 / S17400 / 1.4542 / SUS630 / AISI630 But Weld Fittings 45 Deg 90 Deg Elbow 1” To 48” SCH40S 17-4PH(630) China standard:0Cr17Ni4Cu4Nb American standard:630(S17400) AISI 630 Germany ...