Weld Neck Flange (RTJ WN Flange) Product Name: welding neck flange (RTJ type) Size: 1/2"-24" Nominal Pressure: 150-2500lbs Material: F316/F304/F316L/F304L/A105 /F5/F11/F22 15CrMo,12CrMoV,Q235,16Mn,20#, etc Standard: ANSI B 16.5/ASME B16.47(big diameter) Other standards: JIS/DIN/UNI/GB