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ASME / ANSI B16.5 F347 / 347H Stainless Steel Welded Neck Flange RF 1. Material Grade:WP304 , WP304L , WP304H , WP316 , WP316L , WP316Ti , WP309S , WP310S , WP321 , WP321H , WP347 , WP347H , F304 , ...