核电用TP304不锈钢方管成型方法研究

Research on Formation Process for TP304 Stainless Steel Square Pipe for Nuclear Power Service

通过变形力计算、有限元模拟分析、工艺试验等方法,对一种应用在AP1000核反应堆上的TP304不锈钢方管的成型方法进行了研究,开发出一种热挤压荒管在定径定壁后,经第1道次空拔、第2道次衬拉,最终制成方管的成型工艺,并确定了各项工艺参数。研究表明:采用固定模拉拔法生产核电用TP304不锈钢方管是可行的,且成品材质性能均匀一致,尺寸精度高。

The formation process for the TP304 stainless steel square pipe as applied to the AP1000 nuclear reactor is studied by means of such methods as deformation force calculation,finite element analysis,and technology testing,etc. As a result,a new formation process for the said pipe is developed,and the operation steps are：with the first pass,the hot-extruded blank pipe as sized is sink drawn,and with the second pass,the pipe is dawn with a mandrel,and finally it is turned into a square pipe as required. Moreover,all the parameters of the formation process are determined. The study shows that it is practical to employ the fixed-die drawing process to produce the TP304 stainless steel square pipe for nuclear power service,and that the finished product is in possession of material property homogeneity and high dimensional accuracy.