welded neck flanges

1,Inplement standard:ASME\ANSI B16.9 GB12459 GB\T13401 SH3408-96 SH3409-96 Non-standard is available 2, Material Quality of Product:304,304L,316L,321,347 ect. 3,Diameter range:1\2’’ -48’’ 4,Sealing surface typeFF,RF,FM,M,T,G,TH,RJ ,PL 5,Making methods:IF,SW,Th,PJ,PJ\RT,WA,SO