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carbon steel butt welded pipe cap product specifications 1.STANDARDS: ANSI B16.9 ASTM A234 WPB, JIS,DIN. ETC. 2.SIZE:1/2"---48" 3.THICKNESS:STD,SCH40,SCH20,SCH60,SCH80,SCH100,SCH120,SCH160,XS,XXS,SGP, ...