... .Stanndard:ANSI,BS,DIN,UNI,JIS,GB 3.Use:water supply,chemical,petroleum industry 1.NameStainless steel welding neck flange2.Standard ... TUV,Lloyd's Register,BV.13.Application:petroleum, chemical industry,shipping industry,water supply,etc14.Advantages:1.High production ability.2 ... 5K, 10K, 16K and 20K 5. Type: Welding Neck6. Face treatment: Transparent oil, rust-proof oil, hot galvanized7. Process: free ...