... ring 1,material:alloy steel,carbon steel, stainless steel 2,professional UT 3,all ... user's special requirements 2,steel material :15#,20#,25#,30#.35#,40#,45#,46#, alloy steel,carbon steel, stainless steel etc ... kind of forged flange ring as per customer's requirement.3, inspection: factory in-huouse ... Professional engineers 8, Prompt Delivery (alloy steel,carbon steel ,stainess steel)forged flange ring