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welded elbow product specifications 1)Type :ELBOW 2) Standard: ANSI, JIS, DIN, GB 3) Material: A234 WPB,A420 WPL6,MSS SP75 WPHY52-70,A403 WP304(H),WP304L,WP316(H),WP316L,WP321, A234 WP5,WP9,WP11,WP12...