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ASTM A182 / ASME SA182 F316 / 316L PN20-420 Stainless Steel Socket Welding Flange 1. Material Grade:WP304 , WP304L , WP304H , WP316 , WP316L , WP316Ti , WP309S , WP310S , WP321 , WP321H , WP347 , ...