... ring 1,material:alloy steel,carbon steel, stainless steel 2,professional UT 3,all kind of types Forged Flange ring Specification 1,Standard: ... 15#,20#,25#,30#.35#,40#,45#,46#, alloy steel,carbon steel, stainless steel etc or according to customers' different requirements. 3,Dimension ... Accepted 7, Professional engineers 8, Prompt Delivery (alloy steel,carbon steel ,stainess steel)forged flange ring