ASTM B16.9 B16.11 PIPE FITTING FLANGES 1.Pressure class 150 300 600 900 ... 2.DN15-DN200 3.ISO9001/2000 ASTM B16.9 B16.11 PIPE FITTING FLANGES Typewelding neck flange(WN),slip on flange ... (SO),threaded flange(TF),socket welding flange(SW),blind flange(BL)OD1/4''-48"WTCL150-CL3000StandardASME ,GB,DIN,JISMaterial A105,A182F5 ...