... flange, SW flange, PL flange, BL flange, LJ flange, TH flange, Usage: Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etc MATERIAL Stainless Steel Flanges ASTM / ASME A ... /70/A350/LF3/A350 LF2. Alloy Steel Flanges ASTM A182 F1/F5/F9/F11/F22/F91. Large Diameter Forged High Pressure Flange Cover