铸造法兰是使用比较普遍的一种法兰工艺，具有生产效率高，生产成本低等优点，适用于中低压管道。在高压力工作的管路中，建议采用锻造法兰。铸造法兰密封面形式可以分为平面(FF)、突面(RF)、凹凸面(MFM)、榫槽面(TG)、环连接面(RJ)。常用压力等级：PN6，PN10，PN16，PN25，PN40，PN64，PN100，PN160
Foundry flange is a common flange process, which has the advantages of high production efficiency and low production cost. It is suitable for medium and low pressure pipelines. Forging flange is recommended in high pressure pipeline. The sealing surface of casting flange can be divided into plane (FF), protruding surface (RF), concave and convex surface (MFM), tenon and groove surface (TG) and ring connection surface (RJ). Common pressure levels: PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160