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厚壁大直径不锈钢管的扩径推弯成型是无缝弯头成型的难点。针对φ406．4mm×32mm-R610mm的厚壁0Cr18Ni9Ti钢管弯头扩径推湾成型过程，校核了芯棒的强度，提出了芯棒的合理材质及加工方法，确定了芯棒的形状、温度分布及成型管还与感应圈之间的间隙等。经生产验证，其结果合理可行。
Thick-walled large-diameter stainless steel tube diameter push-bend molding is the seamless elbow molding difficulties. For the φ406.4mm × 32mm-R610mm thick-wall 0Cr18Ni9Ti steel elbow expansion push Bay molding process, check the strength of the mandrel, put forward the mandrel of a reasonable material and processing methods to determine the mandrel shape, temperature distribution And forming the tube and the gap between the sensor and so on. After production verification, the result is reasonable and feasible.