Steel Flange with different pressures have different thicknesses and use different bolts. When the water pump and valve are connected to the pipeline, some parts of these equipments are also made into corresponding flange shapes, also called flange connection. Equipment flanges All connecting parts that are connected by bolts on the two planes and closed at the same time are generally called "flanges". For example, the connection of ventilation pipes, such parts can be called "flange parts". Material Carbon steel ASTM A105, A350 LF1, LF2, LF3, LF6, CL1/CL2,; A694 F52, F60, F65, F70; A516 Gr. 60, 70; BS-EN 10222-2 P245GH, P280GH; EN10222-4 P355NH, P355QH; EN10273 P250GH, P265GH; DIN 17243 C22.8; VD-TUEV350/3 C21; GB/T 1591 Q345B, Q420B;…