Stainless Steel Welding Neck Flange Size:DN10-DN150,1/2"-24" Material:SUS304,SUS316L Certificate: ... be manufactured according to the standards such as GB,HG,HGJ,SHJ and API,ANSI, MSS-SP and BS, NID,JIS ... win-win,create the beautiful future. Stainless Steel Welding Neck Flange