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Carbon Steel Reducer Butt weld Concentric Reducer 16mn Q235 SCH40 Sch80 Sch160 tandard: ASTM/ANSI.B16.9 ASTM/ANSI B16.28 ASTM /ANSI B16.11 ASTM/ANSI B16.25 BS1965 BS1640 DIN 2605 DIN2615 DIN2616 ...