I made a mistake. Our DCU HCGO draw tray(op. temperature 360C) material is 410S. And our CDU LGO draw tray(410s, op. temperature 325C) and VDU wash oil draw tray(410s, op. temperature 350C) also have cracks at welds.
Do we need to upgrade the tray material or renew the tray in a period of operation?