... requirements!standard forged flangesstandard pressure rate ANSIANSI B16.5class150,300,600,900,1500,25001/2"-24"slip-on flange( ... flange(RJF)long welding neck flange ANSIANSI B16.5class150,300,400,600,900,1500,25001/2"-24" MSSASME ... B16.47SER,Aclass150,300,400,600,900 12"-60" APIASME B16.47SER, ... .Welcome to your enquiry! rough machining side piece forging made in China