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Ansi 16.9 Forged Steel Socket Weld Flange For Oil Gas Pipeline Pipe Fittings Product Elbows Alloy steel ASTM A234 WP12/WP11/WP22/WP5/WP9/WP91 Stainless steel ASTM A403 WP304/WP304L/WP316/WP316L Carbon ...