公开(公告)号：EP3104989A4

公开(公告)日：2017-11-29

申请号：EP15749183

申请日：2015-02-11

申请人： ARCONIC INC

发明人： SCHULTZ ROBERT W ,  DAIL GERRY J ,  ROADMAN RONALD EUGENE ,  BORGES AL

IPC分类号： B21C25/08

CPC分类号： B21C37/16 ,  B21C23/085 ,  B21C25/02 ,  B21C25/04 ,  F16L9/006 ,  F16L9/02

摘要： In some embodiments, the instant invention provides for a method including: extruding, utilizing a first die and a mandrel, a hollow tube having a first tube section having a first outer tube diameter of Z, a first inner tube diameter, and a first length; extruding, utilizing a second die and the mandrel, continuing from an end of the first tube section, a hollow tube having a second tube section having a second inner tube diameter and a second length, where the second die has a first die section, and where an angle of a wall of the first die section of the second die relative to a longitudinal axis of the hollow tube ranges from 10 to 45 degrees; extruding a third tube section, a third inner tube diameter, and a third length, and producing a monolithic hollow stepped tube extrudate.