Blind forged flanges are manufactured, exported and supplied by us in a diversity of sizes, class etc. In pipes, valves, pressure vessel openings and other channels requiring closure of one end by blanking off, the blind forged flanges are the perfect fittings. specifications materials usedstainless steel : astm a 182, a 240grade : f 304, 304l, 304h, 316, 316l, 316ti, 310, 310s, 321, 321h, 317, 347, 347h, 904lduplex stainless steel uns s31803, 2205, super duplex stainless steel uns s32750carbon steel : astm a 105, astm a 181alloy steel : astm a 182, gr f1, f11, f22, f5, f9, f91nickel alloys : monel 400 & 500, inconel 600 & 625, incolloy 800, 825, hastelloy c22, c276copper alloys : copper, brass & gunmetalclass : 150, 300, 400, 600, 900, 1500 & 2500 size : 1 / 8" nb to 48"nb