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Welding Neck DIN ANSI Carbon Steel Forged Blind Pn10 RF Carbon Steel A105 Stainless Steel 304 316L Threaded Flange for Oil & Gas, Find Details and Price about Pipe Flange Durable Pipe Flanges from Welding Neck DIN ANSI Carbon Steel Forged Blind Pn10 RF Carbon Steel A105 Stainless Steel 304 316L Threaded Flange for Oil & Gas - Tianjin Shengxiang Cold Drawn Co., Ltd.