... ,DIN,GB 3)Size:1/2"-56" 4)Technique: SO,WN Product Flange,BW flange,PL flange,Carbon steel flange,Blind ... Steel; Alloy steel; Stainless steel TechniqueSMLS,BW,PL,WN,SO,THRSize1/2”-56”Pressure Rating150, 300, 600, 900, 1500, ... according to ISO9001:2000. ASME B16.5,SCH40,CL150 3" WN Flange