... ,A420-WPL6,A234-WP12,A234-WP11,A234-WP5 1.Materials:Carbon steel,stainless steel,alloy steel,and other materials according to customer’s requirements ... alloy,austenitic stainless steel,duplex stainless steel,super duplex stainless steel,inferior duplex stainless steel etc. 2.Size:From 1/2 inch up ... industry,metallurgy,the shipping,urban construction and other professions carbon steel elbow