使管子与管子相互连接的零件。管道工程中最为常见，铸造法兰都是成对使用的管道工程中，铸造法兰主要用于管道的连接对于法兰的芯头制作方法，以国标弯头为倒，若做长半径弯头，要先选定规格，提出管料。扩径率，通过理论计算，一般扩径率在33%-35%之间，倒推回去对焊法兰就是两个大口径管道的连接装置,通常是两个铸造法兰片加若干紧固螺栓，它的塑性好强度低，加入适量碳元素后就会变得坚硬，塑性降低强度增强 法兰是使管子与管子相互连接的零件，连接于管端。

A part that connects a pipe to a pipe. Pipeline engineering are the most common, cast flanges are used in pairs in pipeline engineering casting, mainly used for pipeline flange connection for core head flange production method, the GB elbow is down, if the long radius elbow, to select the specifications, proposed pipe material. The expanding ratio, through theoretical calculation, the general ratio of expanding diameter between 33%-35%, connecting device backward welding flange is two large diameter pipeline, usually two casting flange and several fastening bolts, its plastic strength is low, after adding suitable amount of carbon will become hard, reduce the strength of plastic the reinforced flange pipe and pipe interconnected parts, connected to the pipe end.