... on, welding neck, blind and so on. ANSI B16.5 Ring Joint Facing flange class150-2500Sizes: DN15 to DN1200, 1/2 ... one month after receiving the formal orderInspection: factory in-house self check or Third Party inspectionCarbon Steel:A105,SS400,SF440,RST37 ... high-quality forging, machining, assembly, inspection, packaging productionPaul JingSales manager Ring Joint Facing flange class150-2500