Rajendra Pipe Fittings is a well-known manufacturer, stockiest, supplier, and distributor of ASTM A182 Gr. F91 Flanges. The ASTM A182 Gr. F91 Flanges are a low alloy steel grade which contains merely about 2.25% chromium in its alloy. The flanges made from this type of Gr. F91 steel alloy are widely used in applications that involve oil patch wellhead for block valves, connectors and hangers.