Carbon steel: ASTM/ASME A234 WPB,WPC Alloy metal: ASTM/ASME A234 WP one-WP twelve-WP 11-WP 22-WP 5-WP 91-WP 911 Chrome steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H Reduced-temperature metal: ASTM/ASME A402 WPL three-WPL 6 Higher effectiveness: ASTM/ASME A860 WPHY 42-46-fifty two... https://www.wilsonpipeline.com/product-category/stainlessduplex-steel-pipe.html